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Chapter 7 Modbus Communications

This chapter specifies the Modbus Communications protocol as
RS-232 or RS-485 interface module is installed. Only RTU mode is
supported. Data is transmitted as eight-bit binary bytes with 1 start bit,
1 stop bit and optional parity checking (None, Even or Odd). Baud
rate may be set to 300, 600, 1200, 2400, 4800, 9600, 14400, 19200,
28800 and 38400.

7-1 Functions Supported

Only function 03, 06 and 16 are available for this series of controllers.
The message formats for each function are described as follows:

Query ( from master )

Response ( from slave )

Slave address (0-255)
Function code (3)
Starting address of register Hi (0)
Starting address of register Lo (0-61,
128-143)
No. of words Hi (0)
No. of words Lo (1-22)
CRC16 Hi
CRC16 Lo

Byte count
Data 1 Hi
Data 1 Lo
Data 2 Hi
Data 2 Lo

CRC16 Hi
CRC16 Lo

Function 03: Read Holding Registers

Function 06: Preset single Register

Query ( from master )

Response ( from slave )

Slave address (0-255)
Function code (6)
Register address Hi (0)
Register address Lo (0-61, 128-143)
Data Hi
Data Lo
CRC16 Hi
CRC16 Lo

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UM0L911C

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Содержание L91

Страница 1: ...User s Manual BRAINCHILD TEMPERATURE LIMIT CONTROLLER L91 DIN EN ISO 9001 Certificate 01 100 98505 R R APPROVED UM0L911C...

Страница 2: ...commended that a process should incorporate a LIMIT CONTROL like L91 which will shut down the equipment at a preset process condition in order to preclude possible damage to products or system Informa...

Страница 3: ...t Wiring 2 10 Output 1 Wiring 2 11 Output 2 Wiring 2 12 RS 485 Chapter 3 Programming 3 1 Process Input 3 2 Limit Control 3 3 Set point Range 3 4 PV Shift 3 5 Digital Filter 3 6 Process Alarms 3 7 RS 4...

Страница 4: ...nput Wiring Figure 2 10 Output 1 Wiring Figure 2 11 Output 2 Wiring Figure 2 12 RS 485 Wiring Figure 3 1 Conversion Curve for Linear Type Process Value Figure 3 2 Filter Characteristics Figure 3 3 Nor...

Страница 5: ...econd allows the L91 to control fast process such as pressure and flow Digital communication RS 485 is available as an additional option This option allows L91 to be integrated with supervisory contro...

Страница 6: ...hermocouple J K T E B R S N L C P RTD PT100 DIN PT100 JIS mV 0 60 mV 2 Voltage 0 1 V 3 Voltage 0 10 V 4 Current 0 20mA 9 Special Order Signal Input 1 Form C relay rated 2A 240VAC 2 Pulsed voltage to d...

Страница 7: ...ort is used for off line setup and calibration procedures only Don t attempt to make any connection to these jumpers when the unit is used for a normal control purpose KEYPAD OPERATION SCROLL KEY This...

Страница 8: ...y ONE reset operation will Note occur If the unit subsequently goes into a state where reset is required again the RESET key or remote reset contacts must be released opened and pressed closed again U...

Страница 9: ...two alternating phases These characters are displayed differently Table 1 1 Display Form of Characters A E I N S X B F J O T Y C G K P U Z c H L Q V D h M R W DISPLAY FORM 9999 will be displayed as NO...

Страница 10: ...econd The left diagram shows Year 2001 Month February 2 Date 25 th This means that the product is produced on February 25 th 2001 Note that the month code is for is A October B for and is for November...

Страница 11: ...before applying power to the unit During power up a self test procedure is performed within 6 5 seconds During self test period all outputs are left off When the self test procedure is complete the u...

Страница 12: ...1 function Output 1 hysteresis value Lower limit of HSP1 Lower limit of LSP1 Upper limit of HSP1 Upper limit of LSP1 Output 2 function Address for digital communication Baud rate Parity bit Analog out...

Страница 13: ...the OUT1 relay is de energized After 6 5 seconds self test period if the process is below the high limit set point HSP1 the output 1 relay will be energized and OP1 indicator will go off If the proce...

Страница 14: ...r will go off If the process goes below the low limit set point the relay will be de energized the OP1 indicator will go on and the display will show the process value After the process rises above th...

Страница 15: ...go off If the process goes above the high limit set point or below the low limit set point the relay will be de energized the OP1 indicator will go on and the display will show the process value After...

Страница 16: ...L High HSP H Low LSP L High LSP H 100 0 BC 212 0 BF 0 BC 32 0 BF 90 0 BC 194 0 BF 0 J type thermocouple 1 K type thermocouple 2 T type thermocouple 3 E type thermocouple 4 B type thermocouple 5 R typ...

Страница 17: ...0 10V linear voltage Parameter Notation Parameter Description Range Default Value INPT Input Type Selection 1 0 0 1 17 UM0L911C UNIT RESO Process Unit Display Resolution 0 Degree C unit 2 Process unit...

Страница 18: ...ue FILT PV Filter Time Constant 3 1 second time constant 0 0 second time constant 4 2 seconds time constant 5 5 seconds time constant 6 10 seconds time constant 7 20 seconds time constant 8 30 seconds...

Страница 19: ...32 0 BF 1000 0 BC 1832 0 BF 100 0 BC 148 0 BF OUT 2 Output 2 Function 5 Event input 0 No function 1 DC power supply output 2 RS 485 Communication 3 Alarm output ADDR Address Assignment of Digital COM...

Страница 20: ...ty 1 8 bit odd parity 2 8 bit none parity 0 5 9 6 Kbits s baud rate 3 2 4 Kbits s baud rate 4 4 8 Kbits s baud rate 2 1 2 Kbits s baud rate AOFN Analog Output Function 0 Process value 1 High Limit Set...

Страница 21: ...lue 2 Display the word SAFE 2 Remote lock for the unit 1 Remote reset for output 1 output 1 on 0 No event function 0 DISP Normal display format 0 PV HI Historical Max value of PV Low 19999 High 45536...

Страница 22: ...ent to rain or excessive moisture Do not use this instrument in areas under hazardous conditions such as excessive shock vibration dirt moisture corrosive gases or oil The ambient temperature of the a...

Страница 23: ...eded It is recommended that power of these units to be protected by fuses or circuit breakers rated at the minimum value possible All units should be installed inside a suitably grounded metal enclosu...

Страница 24: ...adversely affect the operation of microprocessor based controls For this reason we strongly recommend the use of shielded thermocouple extension wire which connects the sensor to the unit This wire is...

Страница 25: ...ocal requirements regarding electrical installation should be rigidly observed Consideration should be given to prevent from unauthorized person access to the power terminals Proper sensor installatio...

Страница 26: ...C or 0 75 of sensed temperature half that for special plus drift caused by improper protection or an over temperature occurrence This error is far greater than controller error and cannot be correcte...

Страница 27: ...e RTD offers the capability of lead resistance compensation provided that the three leads are of same gauge and equal length 2 7 RTD Input Wiring Two wire RTD should be avoided if possible for the pur...

Страница 28: ...nd linear current connections are shown in Figure 2 7 and Figure 2 8 Figure 2 7 Linear Voltage Input Wiring Figure 2 8 Linear Current Input Wiring 0 60mV 0 1V 0 5V 1 5V 0 10V 1 2 3 4 5 6 7 8 9 10 0 20...

Страница 29: ...ell as an open collector signal The event input function EIFN is activated as the switch is closed or an open collector or a logic signal is pulled down Open Collector Input Switch Input 1 2 3 4 5 6 7...

Страница 30: ...e Figure 2 10 Output 1 Wiring To Controller Output Three Phase Delta Heater Load MCB Contactor 120V 240V Mains Supply Three Phase Heater Power To Controller Output Relay or Triac SSR Output to Drive C...

Страница 31: ...OAD 120V 240V Supply Relay or Triac Output 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 LOAD _ SSR 120V 240V Supply Pulsed Voltage to Drive SSR Sensor or Transmitter DC Power Supply Output 31 Figure 2 11...

Страница 32: ...8 9 10 1 2 3 4 5 6 7 8 9 10 2 12 RS 485 Max 247 units can be linked SNA10A RS 485 to RS 232 network adaptor TX1 TX2 PC RS 232 TX2 TX1 TX2 TX1 RS 485 Twisted Pair Wire Figure 2 12 RS 485 Wiring Termin...

Страница 33: ...rameters IN LO Selects the low scale value for the Linear type input IN HI Selects the high scale value for the Linear type input Hidden if T C or RTD type is selected for INPT Hidden if T C or RTD ty...

Страница 34: ...High Low Limit Control Refer to for the limit control operation Section 1 6 O1 HY Output 1 hysteresis value The hysteresis value is adjusted to a proper value to eliminate the relay jitter in a noisy...

Страница 35: ...ue 3 5 Digital Filter In certain applications the process value is too unstable to be read To Improve this a programmable low pass filter incorporated in the L91 can be used This is a first order filt...

Страница 36: ...are two types of alarm mode can be selected these are normal alarm and latching alarm Normal Alarm AL MD NORM When a normal alarm is selected the alarm output is de energized in the non alarm conditio...

Страница 37: ...communication is the most economic way The signal is transmitted and received through the PC communication Port generally RS 232 Since a standard PC can t support RS 485 port a network adaptor such as...

Страница 38: ...ay will indicate HSP1 value for high limit control OUT1 HI and high low limit control OUT1 HI LO or indicate LSP1 value for low limit control OUT1 LO IF SAFE is selected the display will indicate the...

Страница 39: ...Application 1 2 3 4 5 6 7 8 9 10 V or mA Three wire Transmitter or sensor 1 2 3 4 5 6 7 8 9 10 Bridge Type Sensor Caution Don t use the DC power supply beyond its rating current to avoid damage Purcha...

Страница 40: ...function section 1 4 Setup OUT2 EIFN EIFN REST Remote Reset 1 2 3 4 5 6 7 8 9 10 Figure 3 6 Remote Reset Application 3 11 Remote Lock If EIFN is selected for OUT2 and LOCK is selected for EIFN termina...

Страница 41: ...p menu The reference data are read only data The maximum historical PV displayed by which shows the maximum process value since the last UNLOCK operation The minimum historical PV displayed by which s...

Страница 42: ...rature A limit control L91 is used to protect the process from being over heated The wiring diagram is shown below 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 Temperature Control Limit Control L N _ C91...

Страница 43: ...0 005 accuracy 0 10V voltage source with A0 005 accuracy 0 20mA current source with A0 005 accuracy 0 300 ohm resistant source with A0 005 accuracy 2 A test chamber providing 25 BC 50BC temperature ra...

Страница 44: ...moment If the display didn t blink then the calibration fails Normal Mode Setup Mode Ad0 ADG CJTL CJG REF SR 4 seconds 4 seconds RESET RESET RESET RESET RESET RESET RESET Step 1 4 seconds Step 2 4 sec...

Страница 45: ...ld junction Setup the equipment according to the following diagram for calibrating the cold junction compensation Note that a K type thermocouple must be used 4 5 The 5520A calibrator is configured as...

Страница 46: ...6 7 8 9 10 100 ohms Figure 5 3 RTD Calibration Press for at least 4 seconds The display will blink a moment If the display didn t blink then the calibration fails Step 6 Calibrate RTD serial resistan...

Страница 47: ...49K 39W 3 92K 3 92K 3 01W X X X X X X 2 Perform to calibrate the linear input zero Step 1 3 Perform but send a span signal to the input terminals Step 2 instead of 60mV The span signal is 1V for 0 1V...

Страница 48: ...Effect T C 0 2 uV ohm 3 wire RTD 2 6 BC ohm of resistance difference of two leads 2 wire RTD 2 6 BC ohm of resistance sum of two leads 200nA Burn out Current 120db Common Mode Rejection Ratio CMRR Se...

Страница 49: ...00 C 1820 C 2 2 M 2 2 M 2 2 M 2 2 M 2 2 M 2 2 M 2 2 M 2 2 M 2 2 M 2 2 M PT100 DIN A2 LC A2 LC A2 LC A2 LC A2 LC A2 LC A2 LC A2 LC A0 4 LC A0 4 LC A0 05 A2 LC 0 C 1767 8 C 32 F 3214 F 250 C 1300 C 418...

Страница 50: ...s Max On state Voltage 1000 Mohms min at 500 VDC Insulation Resistance 2500 VAC for 1 minute Dielectric Strength DC Voltage Supply Characteristics Installed at Output 2 Type Tolerance Max Output Curre...

Страница 51: ...e 40 BC to 60 BC Storage Temperature 0 to 90 RH non condensing Humidity 20 Mohms min at 500 VDC Insulation Resistance 2000 VAC 50 60 Hz for 1 minute Dielectric Strength 10 55 Hz 10 m s for 2 hours Vib...

Страница 52: ...ailable for this series of controllers The message formats for each function are described as follows Query from master Response from slave Slave address 0 255 Function code 3 Starting address of regi...

Страница 53: ...Data value out of range or attempt to write a read only or protected data 2 3 7 2 Exception Responses If the controller receives a message which contains a corrupted character parity check error frami...

Страница 54: ...le value for linear input PV shift offset value Accumulated time during abnormal condition Output 1 function Output 1 hysteresis value 1 1 1 1 1 0 0 0 1 1 1 0 0 0 2 1 1 1 1 1 1 65535 65535 65535 1 1 1...

Страница 55: ...f hour mV calibration high coefficient Cold junction calibration low coefficient RTD calibration low coefficient 1 1 0 0 0 0 0 0 2 0 0 0 0 0 0 0 1999 9 199 99 1999 9 1999 9 1999 9 1 1 65535 65535 6553...

Страница 56: ...OHI Conditions Non linear input Linear input RESO 0 Linear input RESO 1 Linear input RESO 2 Linear input RESO 3 Scale low 1999 9 19999 1999 9 199 99 19 999 Scale high 4553 6 45536 4553 6 455 36 45 536...

Страница 57: ...le high value of the parameter The conversion formulas are as follows M 65535 SH SL A SL A 65535 SH SL M SL 7 5 Communication Examples Example 1 Down load the default values via the programming port T...

Страница 58: ...rds 4 Preset the third group of the parameters Addr O1 HY 0 1 Reserved OUT1 2 Bytes 00 00 00 00 13 11 10 01 00 00 02 26 00 00 Func Starting Addr No of words Reserved 00 00 00 00 00 00 00 4E Reserved R...

Страница 59: ...eset function same effect as pressing key RESET Query Addr Func Starting Addr CMND 26661 CRC16 06 00 8E 68 25 HI LO Example 4 Read 22 parameters at most one time Query Addr Func Starting Addr No of wo...

Страница 60: ...the slave Communication error attempt to write a read only data or a protected data 14 Don t write a read only data or a protected data to the slave Communication error write a value which is out of...

Страница 61: ...cations are subject to change without notice In addition Brainchild reserves the right to make changes without notification to Purchaser to materials or processing that do not affect compliance with a...

Страница 62: ...Electronic Co Ltd No 209 Chung Yang Rd Nan Kang Dist Taipei Taiwan R O C 115 Tel 886 2 27861299 Fax 886 2 27861395 website www brainchildtw com...

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