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Mitsubishi Electric MELSEC FX2N-2LC, User Manual

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Mitsubishi Electric MELSEC FX2N-2LC User Manual Download Page 74

FX2N-2LC Temperature Control Block

Buffer Memory (BFM) 7

7-20

7.2.31

BFM #49 (CH1) and BFM #68 (CH2): Loop breaking alarm judgement time

In BFM #49, set the loop breaking alarm judgement time of CH1.  In BFM #68, set the loop
breaking alarm judgement time of CH2.  
The loop breaking alarm function starts to detect the variation of the measured value (PV) at
every loop breaking alarm judgment time when the output becomes more than 100% (or the
output limiter upper limit) or less than 0% (or the output limiter lower limit), then sets to ON the
loop breaking alarm (CH1: BFM #1 b8, CH2: BFM #2 b8) when judging that there is an abnor-
mality in the control loop.
The allowable set range is from 0 to 7,200 sec.
When BFM #49/#68 is set to "0", the loop breaking alarm function is disabled.

Abnormality judgment criteria

Abnormality targets

1) Abnormality in control target: Heater disconnection, lack of power supply, wiring mistake,

etc.

2) Abnormality in sensor: Sensor disconnection, short-circuit, etc.

3) Abnormality in operating machine: Molten relay, wiring mistake, etc.

4) Abnormality in output circuit: Molten relay inside instrument, etc.

5) Abnormality in input circuit: No change in the measured value (PV) even after input has

changed

The loop breaking alarm function judges abnormalities in the control loop, but cannot detect
positions in which abnormalities occur.
Check each part of the control system in turn.

Table 7.5: Heating control (reverse operation)

When output is less than 
0% or output limiter lower 
limit

When measured value (PV) does not decrease at least by loop breaking 
change criteria (2 

°

C) within loop breaking set time, an alarm is issued.

When output is more than 
100% or output limiter 
upper limit

When measured value (PV) does not increase at least by loop breaking 
change criteria (2 

°

C) within loop breaking set time, an alarm is issued.

Table 7.6: Cooling control (normal operation)

When output is less than 
0% or output limiter lower 
limit

When measured value (PV) does not decrease at least by loop breaking 
change criteria (2 

°

C) within loop breaking set time, an alarm is issued.

When output is more than 
100% or output limiter 
upper limit

When measured value (PV) does not increase at least by loop breaking 
change criteria (2 

°

C) within loop breaking set time, an alarm is issued.

Summary of Contents for MELSEC FX2N-2LC

Page 1: ...USER S MANUAL FX2N 2LC Temperature Control Block ...

Page 2: ... and understood If in doubt at any stage of the installation of the communication facilities of FX series always consult a professional electrical engineer who is qualified and trained to the local and national standards which apply to the installation site If in doubt about the operation or use of the communication facilities of FX series please consult the nearest Mitsubisi Electric distributor ...

Page 3: ...i FX2N 2LC Temperature Control Block USER S MANUAL Manual number JY992D85801 Manual revision A Date January 2000 FX2N 2LC Tempereture Control Block ...

Page 4: ...FX2N 2LC Tempereture Control Block ii ...

Page 5: ...7 278 695 Please tick the box of your choice What condition did the manual arrive in Good Minor damage Unusable Will you be using a folder to store the manual Yes No What do you think to the manual presentation Tidy Un friendly Are the explanations understandable Yes Not too bad Unusable Which explanation was most difficult to understand Are there any diagrams which are not clear Yes No If so whic...

Page 6: ...FX2N 2LC Tempereture Control Block iv ...

Page 7: ...ll operators of the completed equipment should be trained to use that product in a safe and coordinated manner in compliance to established safety practices The operators should also be familiar with documentation which is connected with the actual operation of the completed equipment Note Note the term completed equipment refers to a third party constructed device which contains or uses the produ...

Page 8: ...ipment All examples and diagrams shown in this manual are intended only as an aid to understand ing the text not to guarantee operation Mitsubishi Electric will accept no responsibility for actual use of the product based on these illustrative examples Owing to the very great variety in possible application of this equipment you must satisfy yourself as to its suitability for your specific applica...

Page 9: ...ot prevention function 5 2 5 2 Two position control 5 3 5 3 Auto tuning function 5 4 5 3 1 AT auto tuning 5 4 5 3 2 AT bias 5 5 5 4 Auto manual 5 6 5 4 1 Auto mode and manual mode 5 6 5 4 2 Balance less bump less function 5 7 5 5 Heater disconnection detection function 5 8 5 6 Loop breaking alarm function LBA 5 9 6 Alarm 6 1 7 Buffer Memory BFM 7 1 7 1 Buffer memory list 7 1 7 2 Details of buffer ...

Page 10: ... 25 BFM 42 CH1 and BFM 61 CH2 Control output cycle setting 7 15 7 2 26 BFM 43 CH1 and BFM 62 CH2 Primary delay digital filter setting 7 16 7 2 27 BFM 44 CH1 and BFM 63 CH2 Setting change ratio limiter 7 17 7 2 28 BFM 45 CH1 and BFM 64 CH2 AT auto tuning bias 7 18 7 2 29 BFM 46 CH1 and BFM 65 CH2 Normal reverse operation selection 7 18 7 2 30 BFM 47 CH1 and BFM 66 CH2 Setting limiter upper limit BF...

Page 11: ...X2N 2LC Temperature Control Block Introduction 1 1 Introduction 1 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic ...

Page 12: ...FX2N 2LC Temperature Control Block Introduction 1 ...

Page 13: ...s may keep ON or OFF For output signals which may lead to severe accidents design external circuits and struc ture so that the entire system conservatively operates Cautions on installation Use the unit in the environment for the general specifications described in the manual Never use the unit in a place with dusts soot conductive dusts corrosive gas or flamma ble gas place exposed to high temper...

Page 14: ...X2N 2NC Series PC 1 As input sensors two thermocouples two platinum resistance thermometer bulbs or one thermocouple and one platinum resistance thermometer bulb are available 2 Data can be written and read using FROM TO instructions when the FX2N 2LC is connected to the FX2N 2NC Series PC The FX2N 2LC performs arithmetic operation for PID control and output control You do not have to create seque...

Page 15: ...2LC Temperature Control Block Product Configuration 2 1 Introduction 2 Product Configuration 2 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic ...

Page 16: ...FX2N 2LC Temperature Control Block Product Configuration 2 ...

Page 17: ...4 24 O 87 55 90 Status indicator LED 80 0 5 mounting dimension Unit mm Mass kg Outer color Munsell 0 08GY 7 64 0 81 OUT2 24V OUT1 POWER FX2N 2LC 24 24 O PTB PTB 24 COM 24 OUT1OUT2 CT CT FG PTA TC TC PTB PTB CT CT FG PTA TC TC CH1 CH2 Terminal block PC connection cable Screw mounting hole Status indicator LED DIN rail mounting groove DIN rail width 35 mm DIN rail mounting hook Connector for next st...

Page 18: ... Lit green 5 V power is supplied from PC main unit Extinguished 5 V power is not supplied from PC main unit 24V Lit red 24 V power is supplied from outside Extinguished 24 V power is not supplied from outside OUT1 Lit red OUT1 output is ON Extinguished OUT1 output is OFF OUT2 Lit red OUT2 output is ON Extinguished OUT2 output is OFF ...

Page 19: ... installed on the left side of the FX2N 2LC Cautions on installation Use the unit in the environment for the general specifications described in the manual Never use the unit in a place with dusts soot conductive dusts corrosive gas or flamma ble gas place exposed to high temperature dew condensation or rain and wind or place exposed to vibration or impact If the unit is used in such a place elect...

Page 20: ...ed When connecting the FX2N 2LC unit to the FX2N Series PC the interface FX2NC CNV IF is not required For extension an extension cable FX0N 65EC 650 mm and the FX2NC CNV BC sold sepa rately are required Only one FX0N 65EC can be used per system FX2N 32ER FX2N 4AD FX2N 2LC FX2N 2LC FX2N 32MR X000 to X017 FX2N 4AD FX2N 2LC FX2N 2LC Y000 to Y017 Special block No 0 Special block No 1 Y020 to Y037 7 2 ...

Page 21: ...2N 2LC Temperature Control Block Specifications 3 1 Introduction 2 Product Configuration 3 Specifications 3 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic ...

Page 22: ...FX2N 2LC Temperature Control Block Specifications 3 ...

Page 23: ...ter minal Table 3 2 Item Specifications Driving power supply 24 VDC 15 to 10 input from driving power supply terminal Power supply for communi cation 5 VDC supplied from inside of PC main unit Current consumption 24 VDC 55 mA and 5 VDC 70 mA Insulation method Analog input area and PC are insulated by photocoupler Power supply and analog input are insulated by DC DC converter Channels are not insul...

Page 24: ...ed value monitor Temperature alarm 2 Measured value monitor Temperature alarm Control Selected by buffer memory Self diagnosis function Adjustment data and input value are checked by watch dog timer When abnormality is detected transistor output turns off Memory Built in EEPROM Number of times of overwrite 100 000 times Status indication POWER Lit green 5 V power is supplied from PC main unit Exti...

Page 25: ... while input value is 100 to 150 C within 3 0 C while input value is 150 to 200 C Resolution 0 1 C 0 1 F or 1 C 1 F Varies depending on input range of used sensors Sampling period 500 mS Effect of external resis tance Approx 0 35 µV Ω Input impedance 1 Μ Ω or more Sensor current Approx 0 3 mA Allowable input lead wire resistance 10 Ω or less Operation when input is disconnected Upscale Operation w...

Page 26: ...0 0 to 400 0 C 100 0 to 800 0 C 100 to 1200 C 100 to 1600 F 100 to 2100 F 0 to 1700 C 0 to 3200 F 0 to 1700 C 0 to 3200 F Sensor type E T B N Input range 200 0 to 200 0 C 0 to 1000 C 0 to 1800 F 200 0 to 200 0 C 200 0 to 400 0 C 0 to 400 0 C 300 0 to 400 0 F 300 0 to 700 0 F 0 0 to 700 0 F 0 to 1800 C 0 to 3000 F 0 to 1300 C 0 to 2300 F Sensor type PL II WRe5 26 U L Input range 0 to 1200 C 0 to 23...

Page 27: ...nts Output method NPN open collector transistor output Rated load voltage 5 to 24 VDC Maximum load voltage 30 VDC or less Maximum load current 100 mA Leak current in OFF status 0 1 mA or less Maximum voltage drop in ON status 2 5 V maximum or 1 0 V typical at 100 mA Control output cycle 30 seconds Variable within range from 1 to 100 seconds ...

Page 28: ...FX2N 2LC Temperature Control Block Specifications 3 3 6 ...

Page 29: ...FX2N 2LC Temperature Control Block Wiring 4 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 4 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic ...

Page 30: ...FX2N 2LC Temperature Control Block Wiring 4 ...

Page 31: ... addition to interlocking of them in a pro gram in the PLC Correctly connect the power cable of the FX2N 2LC and the PLC as described in this manual If the AC power supply is connected to a DC I O terminal or DC power terminal the PLC may be burnt Never perform external wiring to unused terminals in the FX2N 2LC and the PLC Such wiring may damage the units Perform Class 3 grounding with an electri...

Page 32: ...ed compensating lead wires When using a resistance thermometer bulb use the three wire type and perform wiring with lead wires having small resistance and no difference in the resistance among the three wires Terminal tightening torque 0 5 to 0 8 N m 24 24 OUT1 COM OUT2 CT CT PTA FG PTB TC PTB TC CT CT PTA FG PTB TC PTB TC SSR SSR FX2N 2LC DC24V CT CT Heater Heater Shielded cable Shielded cable Th...

Page 33: ...C Temperature Control Block Introduction of Functions 5 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 5 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic ...

Page 34: ...FX2N 2LC Temperature Control Block Introduction of Functions 5 ...

Page 35: ...becomes deteriorated The FX2N 2LC performs easy PID control with two degrees of freedom in which PID constants realizing good response to disturbance are adopted and the shape of the response to setting can be selected as either fast medium or slow Setting of PID constants and selection of the response to setting can be performed using buffer memories Conventional PID control When PID constants ar...

Page 36: ...k the excessive quantity to the integral value and makes the arithmetic operation result be held at the limit point when the PID arithmetic opera tion result exceeds the limit point upper lower limit of the output limiter so that the PID arith metic operation result always remains inside the effective range Accordingly when a deviation becomes small the correction operation is immediately performe...

Page 37: ...ty dead zone is set repetitious turning ON OFF of the output around the temperature set value SV can be prevented However if the adjustment sensitivity dead zone is set to a large value upward downward fluctuation becomes large accordingly If the adjustment sensitivity dead zone is set to a small value chattering drastic repetitious turning ON OFF may be caused by small oscilla tions of measured v...

Page 38: ...calculated based on the measured values and stored in each parameter When auto tuning normally finishes control continues with new calculated PID constants While auto tuning is performed b14 of the event CH1 BFM 1 CH2 BFM 2 is set to 1 For auto tuning the AT bias can be set In order to calculate proper PID constants by auto tuning set the upper limit of the output lim iter to 100 the lower limit o...

Page 39: ... BFM 20 CH2 BFM 29 is set to 0 AT stop 5 3 2 AT bias Set the AT bias to perform auto tuning in which the measured value PV should not exceed the temperature set value SV The auto tuning function performs two position control using the temperature set value SV hunts the measured value PV then calculates and sets each PID constant However for some control targets overshoot caused by hunting is not d...

Page 40: ...required to change over the mode During changeover the balance less bump less function is actuated Auto mode In the auto mode the measured value PV is compared with the temperature set value SV and the control output MV is given by PID arithmetic operation This mode is selected when the FX2N 2LC is shipped In the auto mode the manual output value is always set to the output value MV Manual mode In...

Page 41: ...e continues to be effective Operation performed when the mode is changed over from manual to auto The control output value is changed over to a value automatically calculated based on the temperature set value SV Operation output quantity The mode is changed over from auto to manual However the operation output quantity follows the operation output quantity in the auto mode Auto Manual Auto Time T...

Page 42: ...hen the reference heater current value is equivalent to or less than the current set value for the heater disconnection alarm while the control output is ON an alarm is issued However if the control output ON time is 0 5 sec or less heater disconnection alarm is not issued 2 When the heater current does not turn off Caused by a molten relay etc When the reference heater current value is more than ...

Page 43: ...to tuning is performed the loop breaking alarm function is disabled If the LBA set time is too short or is not suitable to control targets the loop breaking alarm may repeatedly turn on and off or may not turn on In such a case change the LBA set time in accordance with the situation The loop breaking alarm function judges abnormalities in the control loop but cannot detect positions in which abno...

Page 44: ...FX2N 2LC Temperature Control Block Introduction of Functions 5 5 10 ...

Page 45: ...FX2N 2LC Temperature Control Block Alarm 6 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 6 7 Buffer Memory BFM 8 Program Example 9 Diagnostic ...

Page 46: ...FX2N 2LC Temperature Control Block Alarm 6 ...

Page 47: ...ue SV is less than alarm set value an alarm is issued Input width 5 Upper lower limit deviation When absolute deviation Measured value PV Set value SV is more than alarm set value an alarm is issued Input width 6 Range alarm When absolute deviation Measured value PV Set value SV is less than alarm set value an alarm is issued Input width 7 Upper limit input value alarm with wait When measured valu...

Page 48: ... set value an alarm is issued However when power is turned on and when set value is changed measured value is ignored Input width 13 Lower limit deviation value alarm with re wait When deviation Measured value PV Set value SV is less than alarm set value an alarm is issued However when power is turned on and when set value is changed measured value is ignored Input width 14 Upper lower limit devia...

Page 49: ...ore than the alarm set value an alarm is issued Alarm set value Measured value PV Alarm status Alarm status Non alarm status Time Measured value PV Alarm set value Measured value PV Alarm status Time Measured value PV Alarm status Non alarm status Alarm status Non alarm status Alarm set value Measured value PV Alarm status Devia tion Measured value PV Temperature set value SV When the deviation is...

Page 50: ... is issued For example if the alarm set value is 10 C an alarm is issued when the measured value PV is inside the range from set value SV 10 C to set value SV 10 C Alarm status Non alarm status Alarm set value Measured value PV Alarm status Devia tion Measured value PV Temperature set value SV When the deviation is positive Time Alarm set value Measured value PV Alarm status Devia tion Measured va...

Page 51: ...larm changes accordingly At this time even if the measured value PV becomes the alarm status the alarm re wait function ignores it again and disables the alarm function until the measured value PV goes out of the alarm status again Alarm status Non alarm status Alarm set value Measured value PV Alarm status Devia tion Measured value PV Temperature set value SV When the wait operation is performed ...

Page 52: ...FX2N 2LC Temperature Control Block Alarm 6 6 6 ...

Page 53: ...N 2LC Temperature Control Block Buffer Memory BFM 7 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 7 8 Program Example 9 Diagnostic ...

Page 54: ...FX2N 2LC Temperature Control Block Buffer Memory BFM 7 ...

Page 55: ...esets errors 0 11 Control start stop changeover 0 Stops control 1 Starts control 0 12 21 Set value SV Within set range limiter 0 0 13 22 Alarm 1 set value Unit C or F Allowable set range varies depending on alarm mode set ting 0 0 14 23 Alarm 2 set value 0 0 15 24 Alarm 3 set value 0 0 16 25 Alarm 4 set value 0 0 17 26 Heater disconnection alarm set value 0 0 to 100 0 A When 0 0 is set alarm funct...

Page 56: ... 0 0 46 65 Normal reverse operation selec tion 0 Normal operation 1 Reverse operation 1 47 66 Setting limiter upper limit Setting limiter lower limit to input range upper limit 1300 48 67 Setting limiter lower limit Input range lower limit to setting limiter upper limit 100 49 68 Loop breaking alarm judgement time 0 to 7 200 sec When 0 is set alarm function is disabled 480 50 69 Loop breaking alar...

Page 57: ...And 500 ms later the buffer memory is overwritten with a correct value If a value outside the allowable set range is written to a buffer memory used both for read and write the set value range error b1 of the flag BFM 0 turns on And the buffer memory in which the set value range error has occurred is controlled with the upper limit or the lower limit of the allowable set range 81 CT monitor method...

Page 58: ...If contents of error are not eliminated even after power is turned off once then on again contact Mitsubishi Electric System Service b4 Not used b5 Not used b6 Not used b7 Not used b8 Sum check error for adjustment data error Turns on when an error has been caused by noise or when a failure has occurred in FX2N 2LC If contents of error are not eliminated even after power is turned off once then on...

Page 59: ...Turns on when an alarm has occurred b5 Alarm 2 Turns on when an alarm has occurred b6 Alarm 3 Turns on when an alarm has occurred b7 Alarm 4 Turns on when an alarm has occurred b8 Loop breaking alarm Turns on when a loop breaking alarm has occurred b9 Heater disconnection alarm Turns on when a heater disconnection alarm has occurred b10 Heater meltdown alarm Turns on when a heater meltdown alarm h...

Page 60: ...he measured value reaches the temperature rise completion range BFM 79 and the soak time BFM 80 is finished b15 of the event BFM 1 BFM 2 turns on Example 1 When the soak time is set to 0 Set value SV Example 2 When the soak time is set to any positive value Set value SV Temperature rise completion range Soak time Soak time Temperature rise completed Temperature rise completed Temperature rise comp...

Page 61: ...FM 9 initialize the set values When BFM 9 is set to K0 initial value the default setting command is disabled When BFM 9 is set to K1 addresses 10 to 81 are set to the initial values When BFM 9 is set to K2 addresses 10 to 69 are set to the initial values However the initial value of the setting limiter upper lower limit is the input range upper lower limit It takes 500 ms maximum to perform initia...

Page 62: ...FM 75 write a proper set value 7 2 11 BFM 17 CH1 and BFM 26 CH2 Heater disconnection alarm set value In BFM 17 set a value to recognize heater disconnection in CH1 In BFM 26 set a value to recognize heater disconnection in CH2 When the heater current measured value of each channel input from CT is smaller than the value set to BFM 17 CH1 or BFM 26 CH2 the heater disconnection alarm CH1 BFM 1 b9 CH...

Page 63: ...ntrol are performed Monitor Monitors the measured value BFM 3 4 Temperature alarm Monitors the event input error b0 and b1 of BFM 1 and BFM 2 and alarms 1 to 4 b4 to b7 of BFM 1 and BFM 2 Control Performs temperature control PID control and gives the control output The setting of K0 to K2 above is effective only when control starts BFM 11 While control is stopped only monitor is performed without ...

Page 64: ...efficiency is better The allowable set range is from 0 to 3 600 sec 7 2 19 BFM 35 CH1 and BFM 54 CH2 Derivative time D In BFM 35 set the derivative time of CH1 In BFM 54 set the derivative time of CH2 The derivative operation changes the operation quantity in proportion to the measured value change speed so that increase of deviation which is the difference between the set value SV and the measure...

Page 65: ...esponse becomes slow speed When BFM 36 55 is set to K1 the response becomes medium speed When BFM 36 55 is set to K2 the response becomes fast speed The figure below shows the operation at each setting In order to increase the response speed of the control target to changes in the temperature set value SV select fast In this case however a little overshoot cannot be avoided Overshoot is not desira...

Page 66: ... upper limit and the lower limit for the setting of the control output value MV BFM 5 BFM 6 The allowable set range of the upper limit is from the output limiter lower limit to 105 The allowable set range of the lower limit is from 5 0 to the output limiter upper limit While the output limiter is effective proper PID constants may not be obtained during auto tuning It is recommended not to use the...

Page 67: ...e but is performed in accordance with the preset inclination When the output change ratio limiter is set to a small value that is when the inclination is small the control response becomes slow and the effect of differential is eliminated While two position control is performed the output change ratio limiter is disabled While the output change ratio limiter is effective proper PID constants may n...

Page 68: ... BFM 3 BFM 4 Use this correction value to correct the dispersion among sensors and the difference in the measured value PV from those by other instruments The allowable set range is 50 00 Example Condition To correct 2 C in the range span of 400 C At this time the sensor correction value is as follows Sensor correction value 2 C 400 C x 100 0 5 The display value is as follows Display value Measure...

Page 69: ...ange span of 400 C 400 C x 10 0 100 40 C When the temperature set value is 200 C the range from 180 to 220 C is treated as the dead zone When the adjustment sensitivity dead zone is set to a large value vertical fluctuation becomes large When the adjustment sensitivity is too small small oscillations of the measured value cause chattering 7 2 25 BFM 42 CH1 and BFM 61 CH2 Control output cycle setti...

Page 70: ...be set in accordance with the characteristics of the control target and the noise level If the time constant is too small the input filter cannot give required effect If the time constant is too large the input responsibility is deteriorated The allowable set range is from 0 to 100 sec When BFM 43 62 is set to 0 the filter func tion is disabled While the filter function is disabled data is acquire...

Page 71: ... set to 0 the setting change ratio limiter function is disabled and the set value immediately changes Example When the temperature set value 1 SV1 is changed to the temperature set value 2 SV2 When the power is turned on the PV changes to the SV step by step if the change ratio limiter function is used When the setting change ratio limiter function is used When the alarm function is used the alarm...

Page 72: ...s not desirable Set the AT bias for such a case When the AT bias is set the set value SV AT point with which auto tuning is performed can be changed 7 2 29 BFM 46 CH1 and BFM 65 CH2 Normal reverse operation selection In BFM 46 select the normal or reverse operation of CH1 In BFM 65 select the normal or reverse operation of CH2 When BFM 46 65 is set to K0 normal operation is selected When BFM 46 65...

Page 73: ...put range the set range error flag BFM 0 b1 turns on If an input range value upper lower is entered that is not allowable the set range error flag BFM 0 b1 turns on The same flag is used for both types of errors When changing the input range values make sure that the upper and lower limit values are inside the allowable input range The allowable set range for the lower limit is the higher of two v...

Page 74: ...istake etc 4 Abnormality in output circuit Molten relay inside instrument etc 5 Abnormality in input circuit No change in the measured value PV even after input has changed The loop breaking alarm function judges abnormalities in the control loop but cannot detect positions in which abnormalities occur Check each part of the control system in turn Table 7 5 Heating control reverse operation When o...

Page 75: ...SV and 10 C below the set value SV are treated as the non alarm status region width of 20 C in total While the measured value PV is located within the non alarm region alarm is not issued even if the alarm condition is satisfied The allowable set range is form 0 0 or 0 to the input range span C or F When BFM 50 69 is set to 0 the loop breaking alarm dead zone function is disabled 1 While the tempe...

Page 76: ... to 1300 C 26 N 0 to 1300 C 3 100 to 800 F 27 0 to 2300 F 4 100 to 2400 F 28 PL II 0 to 1200 C 5 J 200 0 to 200 0 10 1 C 29 0 to 2300 F 6 100 0 to 400 0 10 1 C 30 WRe5 26 0 to 2300 C 7 100 0 to 800 0 10 1 C 31 0 to 3000 F 8 100 to 1200 C 32 U 200 0 to 600 0 10 1 C 9 100 to 1600 F 33 300 0 to 700 0 10 1 F 10 100 to 2100 F 34 L 0 0 to 900 0 10 1 C 11 R 0 to 1700 C 35 0 to 1600 F 12 0 to 3200 F 36 JP...

Page 77: ...is issued Input range 3 Upper limit deviation alarm When deviation Measured value PV Set value SV is more than alarm set value an alarm is issued Input width 4 Lower limit deviation alarm When deviation Measured value PV Set value SV is less than alarm set value an alarm is issued Input width 5 Upper lower limit deviation When absolute deviation Measured value PV Set value SV is more than alarm se...

Page 78: ...width 12 Upper limit deviation value alarm with re wait When deviation Measured value PV Set value SV is more than alarm set value an alarm is issued However when power is turned on and when set value is changed measured value is ignored Input width 13 Lower limit deviation value alarm with re wait When deviation Measured value PV Set value SV is less than alarm set value an alarm is issued Howeve...

Page 79: ...d the non alarm status can be prevented The allowable set range is the input range from 0 0 to 10 0 Upper limit input value alarm and upper limit deviation alarm Lower limit input value alarm and lower limit deviation alarm Upper lower limit deviation alarm Alarm set value Measured value PV Alarm status Alarm status Non alarm status Time Measured value PV Dead zone Alarm set value Measured value P...

Page 80: ... the num ber of alarm delays an alarm is issued The allowable set range is from 0 to 255 times input sampling cycle 500 ms Example When the number of alarm delays is set to 5 times 7 2 37 BFM 78 Number of times of heater disconnection alarm delay In BFM 78 set the number of heater disconnection alarm delays This setting is applied to both CH1 and CH2 If the abnormal status consecutively occurs in ...

Page 81: ...tting is applied to both CH1 and CH2 The temperature rise completion soak time is the period of time after the measured value reaches the temperature rise completion range until the temperature rise completion flag turns on In order to cope with a case in which the measured value has reached the temperature rise completion range but is not stable yet by setting the soak time the wait time can be s...

Page 82: ...ad To cope with this the display monitor method can be selected When BFM 81 is set to K0 initial value the ON current and the OFF current are alternately displayed When BFM 81 is set to K1 only the ON current is displayed Even in the OFF time the ON current remains displayed When control is stopped the OFF current is displayed without regard to the setting of BFM 81 7 2 41 BFM 82 Set value range e...

Page 83: ...rol is enabled At the time of shipment the EEPROM stores the initial values Description on operation 1 When the set value backup command turns on the FX2N 2LC turns on the set value backup flag 2 When backup of the set values is completed the set value backup flag turns off When this flag turns off turn off the set value backup command 3 If the set value backup command turns off while the set valu...

Page 84: ...FX2N 2LC Temperature Control Block Buffer Memory BFM 7 7 30 ...

Page 85: ...2N 2LC Temperature Control Block Program Example 8 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 8 9 Diagnostic ...

Page 86: ...FX2N 2LC Temperature Control Block Program Example 8 ...

Page 87: ...y get electrical shock Thoroughly read the manual sufficiently assure safety then perform temperature control An operation mistake may cause damages in the machine or accidents Never disassemble or modify the unit Disassembly or modification may cause failure malfunction or fire For repair contact Mitsubishi Electric System Service Turn off the power before connecting or disconnecting a connection...

Page 88: ...e power is turned on from off X002 Control start ON stop OFF X003 Performs auto tuning when the power is turned on from off CH1 X004 Performs auto tuning when the power is turned on from off CH2 X005 Writes the EEPROM when the power is turned on from off Auxiliary relays M0 to M15 Flags M20 to M35 Events CH1 M40 to M55 Events CH2 Input range Model K 100 0 to 400 0 C PID values Set by auto tuning A...

Page 89: ...et values D2 Not used D3 Temperature measured value PV of CH1 D4 Temperature measured value PV of CH2 D5 Control output value MV of CH1 D6 Control output value MV of CH2 D7 Heater current measured value of CH1 D8 Heater current measured value of CH2 D82 Set value range error address ...

Page 90: ... 1 set value Upper limit deviation 30 C Control response parameter Medium Normal operation reverse operation Reverse operation initial value Setting limiter upper limit 400 0 C for both channels Setting limiter lower limit 100 0 C for both channels Loop breaking alarm dead zone 10 C K 0 K 13 K 30 K 1 MOV TO TO M8000 M15 K 0 K 22 K 30 K 1 Alarm 2 set value Lower limit deviation 30 C K 0 K 47 K4000 ...

Page 91: ...on alarm with re wait Temperature rise completion range 3 C CT monitor method ON current OFF current initial value Temperature measured value PV BFM 3 CH1 D3 BFM 4 CH2 D4 Control output value MV BFM 5 CH1 D5 BFM 6 CH2 D6 K 0 K 79 K 3 K 1 M8000 Alarm mode setting Lower limit deviation alarm with re wait Flag BFM 0 M0 to M15 Event CH1 BFM 1 M20 to M35 Event CH2 BFM 2 M40 to M55 Heater current measur...

Page 92: ...tarts control K 0 K 29 K 1 K 1 TO P Performs auto tuning CH2 X000 X002 M34 M15 M54 X003 Performs auto tuning CH1 X004 Starts stops control When X002 turns off control stops When X002 turns on control starts In order to turn off the control output this line is required and cannot be omitted The control output cannot be set to OFF by changeover from RUN to STOP of the PLC basic unit In this example ...

Page 93: ...an be monitored using auxiliary relays M In order to output such status to the outside use each auxiliary relay as a contact and drive outputs Y M0 Y 0 M28 Y 1 M48 Y 2 An error is present CH1 loop is disconnected CH2 loop is disconnected Error present is output CH1 loop disconnection alarm is output CH2 loop disconnection alarm is output ...

Page 94: ...FX2N 2LC Temperature Control Block Program Example 8 8 8 ...

Page 95: ...2N 2LC Temperature Control Block Troubleshooting 9 1 Introduction 2 Product Configuration 3 Specifications 4 Wiring 5 Introduction of Functions 6 Alarm 7 Buffer Memory BFM 8 Program Example 9 Diagnostic 9 ...

Page 96: ...FX2N 2LC Temperature Control Block Troubleshooting 9 ...

Page 97: ...r for adjustment data error Turns on when an error has been caused by noise or when a fail ure has occurred in FX2N 2LC If contents of error are not eliminated even after power is turned off once then on again contact Mitsubishi Electric System Ser vice b9 Cold contact temperature compensation data error b10 A D converted value error Table 9 2 Events BFM 1 and BFM 2 indicating errors Bit No Assign...

Page 98: ...X2N 2LC is correctly connected to the PLC Check the connector positions and the connection status Check whether or not the unit No and the BFM Nos are correctly specified in FROM TO instructions 2 The POWER LED is not lit Check whether or not the FX2N 2LC is correctly connected to the PLC Check the connector positions and the connection status Check whether or not the used capacity of the service ...

Page 99: ...ed with this manual All examples and diagrams shown in this manual are intended as an aid to understanding the text not to guarantee operation Mitsubishi Electric will accept no responsibility for actual use of the product based on these illustrative examples Owing to the very great variety of possible applications users must satisfy themselves as to the suitability of each specific application ...

Page 100: ...ARUNOUCHI TOKYO 100 8310 TELEX J24532 CABLE MELCO TOKYO HIMEJI WORKS 840 CHIYODA CHO HIMEJI JAPAN JY992D85801A MEE0001 Effective Jan 2000 Specification are subject to change without notice USER S MANUAL FX2N 2LC Temperature Control Block ...

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