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Chapter 8: RS-485 Modbus Output

65-2646XL-05-04 M2A Transmitter Operator’s Manual

Termination Jumper

The M2A includes a 2-pin termination header (see Figure 4 on page 12) that is used when the
M2A is used in a Modbus system. Every M2A is supplied with a termination jumper (a jumper
block) installed onto this header. If the M2A is not used in a Modbus system, this jumper has no
function. When the M2A is installed in a Modbus system, this jumper must be installed in an
M2A that is at the end of a Modbus line. Any M2A in a Modbus system that is not at the end of a
line must have the termination jumper removed (see Figure 13 & Figure 14 below).

Figure 13: Multiple M2As in a Daisy Chain Configuration

Figure 14: Multiple M2As in a Two Branch Configuration

ID = 125

Modbus

Master

Up to 128 M2As can be connected without a repeater

RS-485

RS-485

M2A

Termination

Jumper

Not Installed

M2A

Termination

Jumper

Not Installed

ID = 127

ID = 126

M2A

Termination

Jumper

Installed

ID = 128

M2A

Termination

Jumper

Not Installed

M2A

Termination

Jumper

Not Installed

ID = 1

ID = 4

ID = 127

M2A

Termination

Jumper

Installed

RS-485

ID = 128

Up to 128 M2As can be connected without a repeater

Modbus

Master

M2A

Termination

Jumper

Not Installed

M2A

Termination

Jumper

Not Installed

M2A

Termination

Jumper

Not Installed

M2A

Termination

Jumper

Not Installed

ID = 3

ID = 2

M2A

Termination

Jumper

Installed

ID = 1

RS-485

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Содержание 65-2646XL-05-04

Страница 1: ...RKI Instruments Inc www rkiinstruments com 65 2646XL 05 04 M2A Transmitter Operator s Manual Part Number 71 0612 Revision P1 Released 10 20 22 ...

Страница 2: ...th Periodic calibration and maintenance of the gas monitor is essential for proper operation and correct readings Please calibrate and maintain this instrument regularly Frequency of calibration depends upon the type of use you have and the sensor types Typical calibration frequencies for most applications are between 3 and 6 months but can be required more often or less often based on your usage ...

Страница 3: ...nty indicates the full extent of our liability and we are not responsible for removal or replacement costs local repair costs transportation costs or contingent expenses incurred without our prior approval THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND REPRESENTATIONS EXPRESSED OR IMPLIED AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF RKI INSTRUMENTS INC INCLUDING ...

Страница 4: ...on 8 Internal Description 11 Chapter 3 Installation Startup 16 Overview 16 Mounting the M2A Transmitter 16 Wiring the M2A Transmitter 18 Start Up 23 Chapter 4 Operation 25 Overview 25 Normal Operation 25 Information Screen 25 4 20 mA Signal Output Operation 26 Alarm Indications 27 Chapter 5 Configuration Mode 30 Overview 30 Viewing Changing M2A Parameters 30 Chapter 6 Gas Type Mode 34 Overview 34 ...

Страница 5: ...41 Replacing Components of the CO Detector 45 Chapter 8 RS 485 Modbus Output 48 Overview 48 Wiring the M2A in a Modbus System 48 Using the M2A in a 4 wire Modbus System 52 Modbus Mode 52 Supported Modbus Functions 54 Chapter 9 Parts List 60 Appendix A Control Button Quick Reference Guide 61 Appendix B PLC and DCS Device Wiring 62 Appendix C Function Code 16 Registers 64 ...

Страница 6: ...D display which is visible through the window in the cover front face and provides a 4 20 mA signal which indicates the target gas reading for use by a gas monitoring controller recording device or programmable controller The M2A also provides an RS 485 Modbus output Three sets of relay contacts two controlled by the gas alarms and one by the fail alarm rated at 115 VAC 5 amps are available for co...

Страница 7: ...nts Alarm Settings Alarm 1 Alarm 2 25 ppm 50 ppm Construction housing Explosion proof junction box NEMA 4X Area Classification Explosion proof for Class I Groups B C and D Sampling Method Diffusion Input Power 10 30 VDC Controls Three push button switches Three magnetic switches for non intrusive calibration Weight 5 5 lbs Signal Output 4 to 20 mA with impedance maximums listed below 12 VDC 500 oh...

Страница 8: ...or situations where the detector needs to be installed at an inaccessible location The detector junction box can be installed at the inaccessible location and the M2A junction box can be installed in a more readily accessible area External Description This section describes the junction boxes and all external components of the M2A transmitter Figure 1 M2A External Components Carbon Monoxide Detect...

Страница 9: ...mount the M2A to a vertical surface at the monitoring site The window in the cover on the front of the junction box allows you to view the OLED display and use the magnetic wand to actuate the magnetic control switches so you can perform non intrusive calibration Removing the cover allows you to access the interior of the junction box Detector Junction Box The detector junction box is intended to ...

Страница 10: ... A pre amplifier located between the sockets and two interconnect wires conditions the sensor s signal before the signal reaches the controller Housing Cap Cap Gasket The housing cap screws onto the detector housing It retains the plug in sensor and protects it from damage The housing cap also includes a flame arrestor which contains any sparks that may occur within the detector and a flame arrest...

Страница 11: ...or ease of calibration The calibration adapter splash guard also protects the detector from splashing water or direct water spray Magnetic Wand The magnetic wand is a short plastic rod with a magnet in one end It is used to actuate the magnetic control switches on the control PCB while the junction box cover is still installed so that non intrusive calibration can be performed Internal Description...

Страница 12: ...r signal detector and Modbus terminal strips The column on the right consists of the relay terminal strips A 20 position connector at the bottom of the terminal PCB is used to connect the terminal PCB to the control PCB with a ribbon cable A 5 position connector on the left side of the terminal PCB is used by factory or field service personnel to program the M2A Figure 4 Terminal PCB Component Loc...

Страница 13: ...o bottom the fail alarm 1 and alarm 2 relay terminal strips They are three position plug in style terminal strips The relay terminal strips are used to connect devices such as lights and horns that are controlled by the relay contacts The relay contacts are rated at 115 VAC 5 amps The relay contacts may also be used to control higher rated relays Termination Jumper A two pin header with a terminat...

Страница 14: ...ontrol PCB It indicates the current gas reading and displays messages and parameters in the M2A s programs Control Buttons The M2A includes three push button switches that allow you to enter the M2A s operating modes navigate through the modes update settings and save changes to the settings The push button switches are located along the bottom edge of the control PCB see Figure 5 The UP YES butto...

Страница 15: ...ay see Figure 5 Fail LED The fail LED turns on when the M2A is experiencing a fail condition A fail condition can be caused by a detector failure or low detector signal Alarm 1 LED The alarm 1 LED is on when the M2A is experiencing an alarm 1 condition Alarm 2 LED The alarm 2 LED is on when the M2A is experiencing an alarm 2 condition RX TX LED s These LED s indicate data being received RX and tra...

Страница 16: ...rocedures The site should be easily accessible For the detector junction box select a site where the target gas is likely to be found first For lighter gases mount the detector near the ceiling for heavier gases mount the detector near the floor The junction boxes should be mounted no further than 200 feet from each other 2 Use 10 screws through the M2A junction box s two mounting slots to secure ...

Страница 17: ... 16 inch I D flexible polyurethane tubing to the fitting at the bottom of the calibration adapter splash guard and route it to an accessible area that is close to the M2A junction box See the Chapter 9 Parts List on page 60 for available tubing 38 2 70 CO Detector Calibration Adapter Splash Guard 3 4 Conduit Hub Ø3 65 11 60 Max 5 25 Rubber Spacer 3X 1 13 ...

Страница 18: ... and set aside while wiring 7 To maintain the explosion proof classification of the junction boxes conduit seals must be installed as shown in Figure 8 Adhere to your local electrical code when installing the conduit seal 8 To maintain the M2A junction box s NEMA 4X environmental rating and prevent water from entering the junction box through the conduit hubs use appropriate construction technique...

Страница 19: ...on rating will also help to prevent water from entering through the top port 13 To gain access to a plug in terminal strip for wiring pull it out of its socket by grasping the wall between two terminal positions with needle nose pliers and pulling Be careful not to exert too much force on the wall to avoid damage to the terminal strip The detector terminal strip and the alarm 1 relay terminal stri...

Страница 20: ...unction box s chassis earth ground Figure 8 Wiring the Detector to the M2A 15 Reinstall the detector terminal strip into its socket 16 If shielded cable is used between the detector junction box and the M2A junction box connect the cable s drain wire to an available chassis earth ground at the M2A junction box Do not connect the shield drain wire at the detector junction box Black Red Red Black Ca...

Страница 21: ...n whether the M2A is wired to a gas monitoring controller or just to power whether any relays are used and whether the Modbus output is used WARNING If the top conduit hub is used for wiring be sure to seal the threads to ensure water does not enter the junction box A conduit seal which is normally required to maintain the junction box s hazardous location rating will also help to prevent water fr...

Страница 22: ...dbus Output on page 48 See Figure 9 below for field wiring connections to the M2A Figure 9 Wiring the M2A Junction Box to a Controller and Alarm Devices 3 Re install the control PCB and ribbon cable if necessary Be sure the ribbon cable is routed down below the control PCB so it will not be damaged by the cover when it is screwed back on 4 Secure the M2A junction box cover to the junction box 5 Ma...

Страница 23: ...up see Calibration on page 41 Verify that the M2A is in a fresh air environment environment known to be free of combustible or toxic gas vapors and of normal oxygen content 20 9 CAUTION If you suspect the presence of carbon monoxide in the monitoring environment use the calibration kit and the zero air calibration cylinder to introduce fresh air to the detector and verify an accurate fresh air set...

Страница 24: ...want a different time out period see Viewing Changing M2A Parameters on page 30 for instructions to change the calibration time out 1 While in normal operation press and hold the UP YES button for 5 seconds to enter Calibration Mode Release the button when the following screen appears 2 Press and release the UP YES button to continue The display will indicate the target gas and CAL Mode for a few ...

Страница 25: ...een The Information Screen displays the M2A s operating voltage and firmware and hardware information To display the Information Screen do the following 1 Press and hold the DOWN NO button for 3 seconds The Information Screen will appear 2 Continue holding the DOWN NO button to keep the Information Screen on the display The top line indicates the operating voltage that is connected to the M2A The ...

Страница 26: ... will continue to indicate this until Calibration Mode is entered and a calibration is performed In this situation the signal output will be fixed at 3 5 mA from the time Gas Type Mode is entered until the M2A is calibrated and returns to normal operation If you enter Calibration Mode Configuration Mode Gas Type Mode or Modbus Mode the signal output will be fixed at 3 5 mA until the M2A returns to...

Страница 27: ...A alerts you to an alarm 1 condition as follows The A1 LED turns on The gas reading alternates with the ALARM 1 message The alarm 1 relay energizes Table 4 Visual and Audible Alarm Indications Condition Cause Visual Indication s Alarm 11 Increasing gas reading at or above the alarm 1 setpoint A1 LED is on Gas reading alternates with ALARM 1 message Alarm 21 Increasing gas reading at or above the a...

Страница 28: ...e M2A senses an alarm 2 condition The M2A alerts you to an alarm 2 condition as follows The A2 LED turns on The gas reading alternates with the ALARM 2 message The alarm 2 relay energizes NOTE If the M2A is in both an alarm 1 and alarm 2 condition both the A1 and A2 LEDs will be on the gas reading will alternate with the ALMS 1 2 message and both alarm relays will energize Responding to an Alarm 2...

Страница 29: ...ce is 9 5 volts or less WARNING While in a low power condition the M2A is not an active gas monitor When the M2A senses a low power condition it alerts you as follows The F LED turns on The message LowPower is indicated on the top line of the OLED display and the input voltage is displayed on the bottom line of the OLED display The fail relay de energizes NOTE The low power alarm cannot be cleared...

Страница 30: ... a new M2A it has been setup at the factory Use Configuration Mode only if you want to change the M2A s setup If you want to change the detector type see Chapter 6 Gas Type Mode on page 34 Viewing Changing M2A Parameters 1 While in normal operation simultaneously press and hold the UP YES and ENTER buttons for 5 seconds to enter Configuration Mode Release the buttons when the following screen appe...

Страница 31: ... operation and de energizes when an alarm 1 condition is initiated ALARM 1 relay reset LATCH If set as LATCH you must press the ENTER button to reset the alarm 1 circuit after the alarm 1 condition passes If set as SELF RST the M2A automatically resets the alarm 1 circuit after the alarm 1 condition passes A1 OnDy alarm 1 on delay 1 secs The amount of time the M2A delays activation of the alarm 1 ...

Страница 32: ...the alarm 2 relay reset setting is set to SELF RST It can be set in 1 second increments from 0 60 seconds in 1 minute increments from 1 15 minutes and in 15 minute increments from 15 60 minutes ZeroSupp 2 ppm The zero suppression feature helps prevent jumpy readings near the fresh air reading For example if the zero suppression is 2 0 ppm the M2A will display a reading of 0 ppm for gas readings fr...

Страница 33: ...on The DO OVER YES NO message will display Press and release the UP YES button The Re do Config message will display and the M2A will return to the first adjustable parameter Go back to step 3 and continue If you wish to save the adjustments made press and release the UP YES button Config Saved is indicated on the display for a few seconds and the M2A returns to normal operation Auto Zero Enabled ...

Страница 34: ...as it does when it is first turned on Selecting the Gas Type 1 While in normal operation or during the warm up sequence press and hold the UP YES and DOWN NO buttons for five seconds Release them when the following screen appears 2 If you want to exit Gas Type Mode press and release the DOWN NO button The display will indicate NO CHANGE and the M2A will return to normal operation If you want to co...

Страница 35: ...te the target gas and the detection range for a few seconds and then the M2A will enter Configuration Mode automatically so that the parameter settings in Configuration Mode can be verified or changed 6 While in Configuration Mode press and release the ENTER button to accept the displayed parameter setting and move to the next one Use the UP YES and DOWN NO buttons to adjust a setting See Chapter ...

Страница 36: ...ttings are as desired 9 After the M2A completes its warm up sequence the display will indicate CAL NEEDED Since the gas type has been changed a successful calibration must be performed before the M2A can enter normal operation 10 Press and release the UP YES button to enter Calibration Mode Normally you must hold the UP YES button for 5 seconds to enter Calibration Mode but since a calibration is ...

Страница 37: ...laceable parts Preventive Maintenance This section describes a recommended preventive maintenance schedule to ensure the optimum performance of the M2A It includes daily and quarterly procedures Daily Verify a display reading of 0 ppm Investigate significant changes in the reading Quarterly Calibrate the M2A as described in Calibration on page 41 See Calibration Frequency on page 40 for a discussi...

Страница 38: ...t the wiring to the power source or controller is correct and secure 2 Verify that the ribbon cable connecting the terminal PCB to the control PCB is securely installed This ribbon cable plugs into a connector on the top edge of the control PCB and on the bottom of the terminal PCB 3 If the power difficulties continue contact RKI for further instruction Frequent or Suspect Alarms The M2A alerts yo...

Страница 39: ...t RKI for further instruction Fail Condi tion M2A indicates a fail condition Controllerindicates a fail condition The detector wiring to the terminal PCB is disconnected or misconnected The wiring from the M2A to the controller is disconnected or misconnected The detector fresh air signal is low enough to cause a fail condition The detector is malfunctioning The terminal or display PCB is malfunct...

Страница 40: ... or span reading during calibration M2A requires frequent calibration NOTE See Calibration Frequency on page 40 for calibration frequency guidelines The calibration cylinder is low out dated or defective The calibration gas flow rate is too low The calibration gas is not an appropriate concentration The detector is malfunctioning The terminal PCB is malfunctioning The flexible tubing to the calibr...

Страница 41: ...ssed between starting the gas flow and noticing a reading response 7 Turn the regulator s on off knob clockwise to close the regulator 8 Unscrew the regulator from the calibration cylinder 9 Disconnect the calibration adapter splash guard s flexible tubing from the regulator NOTE Do not disconnect the flexible tubing from the calibration adapter splash guard 10 Add 1 minute to the length of time d...

Страница 42: ...ead of pushing the control switch buttons To actuate a magnetic switch and perform the same operation as pressing a control switch button touch the magnet in the end of the magnetic wand to the M2A s glass cover directly above the magnetic switch you wish to actuate Touching the glass and removing the wand is the same as pressing and releasing a button Touching the glass and keeping the wand in pl...

Страница 43: ...exible tubing coming from the calibration adapter splash guard to connect the regulator to the calibration adapter 6 Turn the regulator knob counterclockwise to open the regulator 7 Allow zero air to flow for the length of time determined in Determining Response Time on page 41 8 Turn the regulator knob clockwise to close the regulator 9 Unscrew the zero air cylinder from the fixed flow regulator ...

Страница 44: ...00 ppm CO 8 The M2A will perform a span operation The display will indicate SPAN Gas PASS for a few seconds then indicate SPAN Gas SAVED before indicating Leaving CAL Mode for a few seconds NOTE If the span adjustment fails see Troubleshooting on page 38 for recommended actions 9 The display will now alternate between the normal operation screen and the message REMOVE CAL GAS for 1 minute If the c...

Страница 45: ...cap gasket See Figure 2 for an illustration of the CO detector 3 Remove the rubber retaining boot with the charcoal filter disk from the sensor 4 Replace the charcoal filter disk in the rubber retaining boot and install the boot onto the sensor 5 Make sure that the cap gasket is in place and screw the detector cap back onto the housing body 6 Turn on or reconnect power to the M2A Replacing the Plu...

Страница 46: ... cap 11 Turn on or plug in power to the M2A CAUTION Allow the replacement sensor to warm up for 5 minutes before you continue with the next step 12 Calibrate the transmitter as described in the Calibration on page 41 Replacing the CO Detector NOTE In most cases it is only necessary to replace the plug in CO sensor 1 Turn off or unplug power to the M2A 2 Remove the detector junction box cover 3 Uns...

Страница 47: ... see Figure 8 on page 20 8 Screw the calibration adapter splash guard onto the new detector housing cap 9 Reinstall the detector junction box cover 10 Turn on or plug in power to the M2A CAUTION Allow the replacement detector to warm up for 5 minutes before you continue with the next step 11 Calibrate the replacement detector as described in Calibration on page 41 ...

Страница 48: ... 247 unique slave addresses 1 247 The M2A s line driver provides for up to 128 M2As to be connected together without the need for a repeater Figure 13 Figure 14 below illustrate typical M2A wiring configurations If more than 128 M2As need to be connected together RS 485 repeater s should be used such that no more than 128 M2As reside on any given network segment CAUTION The network segment can onl...

Страница 49: ... this configuration 5 wires are used for wiring the M2A into a Modbus system Figure 11 also illustrates typical alarm device wiring The ground jumper must be removed in this wiring configuration Figure 11 Recommended Modbus Wiring Adding an M2A to an Existing M2 Modbus Installation with Recommended Wiring An M2A can be wired into an existing M2 Modbus system The shape of the terminal PCB will be d...

Страница 50: ...ommon terminal on the Modbus controller is omitted Instead the Common terminal on the Modbus controller is connected to the of the 24 VDC power supply The ground jumper must be installed in this wiring configuration Figure 12 Alternate Modbus Wiring Adding an M2A to an Existing M2 Modbus Installation with Alternate Wiring An M2A can be wired into an existing M2 Modbus system The shape of the termi...

Страница 51: ...rmination jumper removed see Figure 13 Figure 14 below Figure 13 Multiple M2As in a Daisy Chain Configuration Figure 14 Multiple M2As in a Two Branch Configuration ID 125 Modbus Master Up to 128 M2As can be connected without a repeater RS 485 RS 485 M2A Termination Jumper Not Installed M2A Termination Jumper Not Installed ID 127 ID 126 M2A Termination Jumper Installed ID 128 M2A Termination Jumper...

Страница 52: ...es the M2A automatically returns to normal operation NOTE If the M2A returns to normal operation because of a time out it enters a warm up period just as it does when it is first turned on 1 While in normal operation simultaneously press and hold the DOWN NO and ENTER buttons for 5 seconds to enter Modbus Mode Release the buttons when the following screen appears 2 To exit Modbus Mode press and re...

Страница 53: ...e M2A returns to normal operation NOTE All M2As on a Modbus network must be configured with the same baud rate and parity and each M2A must have a unique slave ID For an M2A to participate on a network the ENABLED DISABLED setting must be set to ENABLE Table 9 Configuration Parameters Modbus Mode Parameter Available Settings Description Enabled Disabled Can be set to ENABLED or DISABLED factory se...

Страница 54: ... for registers 1 2 is shown below in Table 10 Table 11 Table 10 Register 1 Numerical Reading with Sign Decimal Point Bit Field Assignments Bit s Value Field 15 Sign of Reading 0 Positive 1 Negative 14 13 Format of Reading 0 XXX no decimal point 1 XX X 2 X XX 3 XXX 12 0 Numerical value of display reading 8000 max Table 11 Register 2 Operating State Alarms Relays Bit Field Assignments Bit s Value 15...

Страница 55: ... Fail Not Asserted 1 Fail Asserted 7 6 Alarm 2 Status 0 No Alarm 1 Unacknowledged Alarm 2 Acknowledged Alarm 3 Unused Code 5 4 Alarm 1 Status 0 No Alarm 1 Unacknowledged Alarm 2 Acknowledged Alarm 3 Unused Code 3 Overscale Status 0 Not Overscale 1 Overscale 2 Fail Relay Status 0 Not Energized 1 Energized 1 Alarm 2 Relay Status 0 Not Energized 1 Energized 0 Alarm 1 Relay Status 0 Not Energized 1 En...

Страница 56: ...tion is the same as specified in Register 1 Registers 15 19 Registers 15 19 are the Gas Name ASCII String NULL Terminated Registers 20 22 Registers 20 22 are the Gas Units String NULL Terminated Register 23 Register 23 is the alarm 1 trigger 0 Decreasing 1 Increasing Register 24 Register 24 is the alarm 1 normal relay state 0 Normally De Energized 1 Normally Energized Register 25 Register 25 is th...

Страница 57: ...r 32 is the alarm 2 OFF delay Integer values are in seconds Register 33 Register 33 is zero suppression Toxics and LEL 0 6 of full scale Oxygen 0 0 7 Oxygen The decimal point location is the same as specified in Register 1 Register 34 Register 34 is noise filter Integer values in seconds 0 60 in 5 second increments Register 35 Register 35 is calibration timeout in minutes 5 10 15 20 25 or 30 Regis...

Страница 58: ...g 4 Not Enough Span 5 Negative Reading 6 Span Gas Value Is Not OK 7 Calculated Zero Is Too Low 8 Calculated Zero Is Too High 9 Zero Failure 10 Span Failure 11 Calibration Is Overscale 12 LEL Sensor Offset Is Too High 13 LEL Null Operation Failed 14 Operation Not Performed Register 39 Register 39 is the auto zero disable 0 AutoZero Enabled 1 AutoZero Disabled Register 40 Register 40 is the remote c...

Страница 59: ...description of Function Code 16 see Appendix C Function Code 16 Registers on page 64 Register 16 Register 16 performs the same function as the ENTER button on the M2A It is useful for remotely silencing alarms With the M2A in an alarm condition bit 0 can be used to silence it Table 12 Register 16 Button Function NOTE Register 40 in Function Code 03 the remote configuration register must be set to ...

Страница 60: ...embly includes sensor CSA version 71 0612 65 2646XL 05 04 M2A Transmitter Operator s Manual this docu ment 81 0076RK 01 Zero air calibration cylinder 34 liter steel 81 0076RK 03 Zero air calibration cylinder 103 liter 81 0064RK 01 Calibration cylinder CO 50 ppm in air 34 liter steel 81 0064RK 03 Calibration cylinder CO 50 ppm in air 103 liter 81 1050RK Regulator with gauge and knob 0 5 liter minut...

Страница 61: ... setting Table 14 Control Button Quick Reference Chart Mode Entered or Function Performed Button Combination Adjustable or Viewable Parameters Alarm Reset Press and Release ENTER n a Show Information Screen Press and Hold DOWN NO Input Voltage M2A Version Revision Information Calibration Mode Press and Hold UP YES for 5 seconds Fresh Air Adjust Span or Zero for Oxygen Adjust with Calibration Gas C...

Страница 62: ...terminal strip If the PWR SIG terminal strip connections and one or more relays are used route the connections to the M2A in conduit Use shielded cable in the conduit for the PWR SIG connections and unshielded cable or individual wires for the relay connections Make sure any wire or cable used for relay wiring is appropriately rated for the power that it will carry NOTE If shielded cable is used f...

Страница 63: ...to the M2A Figure 15 PLC and DCS Device Wiring S PWR SIG Alarm 1 Alarm Device Fail Alarm Device Alarm Device Power Typical Alarm Wiring Shown A B C RS 485 4 20 mA In S 24 VDC 24 VDC 24 VDC Power Supply 24 VDC Alarm 2 Alarm Device See Modbus Wiring See Detector Wiring Controller PLC DCS TOXIC OXY C NC NO ALARM 1 C NC NO ALARM 2 C NC NO FAIL ...

Страница 64: ...sing 1 Increasing Register 3 Register 3 is the alarm 1 relay state 0 Normally De Energized 1 Normally Energized Register 4 Register 4 is the alarm 1 relay reset 0 Latching 1 Self Resetting Register 5 Register 5 is the alarm 1 ON delay Integer value is in seconds Register 6 Register 6 is the alarm 1 OFF delay Integer value is in seconds Register 7 Register 7 is the alarm 2 set point Value must be a...

Страница 65: ...lue is in seconds Register 13 Register 13 is the zero suppression Toxics and LEL 0 6 Full Scale Oxygen 0 0 7 Oxygen Value must be an integer Any decimals are omitted Register 14 Register 14 is the noise filter Integer value is in seconds 0 60 in 5 second increments Register 15 Register 15 is the calibration timeout Value is in minutes 5 10 15 20 25 or 30 Register 16 Register 16 is explained in Sup...

Страница 66: ...r This register can be used to clear those flags Table 16 Register 19 Clear Change Flags Register 20 Register 20 is the AutoZero Disable 0 AutoZero Enabled 1 AutoZero Disabled Register 21 Register 21 is the Remote Configuration Register 0 No Remote Configuration 1 Reset Alarm Bit s Value Field 15 2 Unused 1 Write 1 to this bit to clear Gas Type Changed flag 0 Write 1 to this bit to clear Configura...

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