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Chapter 8: RS-485 Modbus Output

65-2662XL-04 M2A-XL Transmitter

Termination Jumper

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

Figure 14: Multiple M2A-XLs 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 65-2662XL-04

Страница 1: ...RKI Instruments Inc www rkiinstruments com 65 2662XL 04 M2A XL Transmitter Operator s Manual Part Number 71 0616 Revision P1 Released 11 15 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: ...8 Internal Description 12 Chapter 3 Installation Startup 17 Overview 17 Mounting the M2A XL Transmitter 17 Wiring the M2A XL Transmitter 19 Start Up 24 Chapter 4 Operation 26 Overview 26 Normal Operation 26 Information Screen 26 4 20 mA Signal Output Operation 27 Alarm Indications 28 Chapter 5 Configuration Mode 31 Overview 31 Viewing Changing M2A XL Parameters 31 Chapter 6 Gas Type Mode 34 Overvi...

Страница 5: ...Replacing Components of the H2S Detector 44 Chapter 8 RS 485 Modbus Output 47 Overview 47 Wiring the M2A XL in a Modbus System 47 Using the M2A XL in a 4 wire Modbus System 51 Modbus Mode 51 Supported Modbus Functions 53 Chapter 9 Parts List 59 Appendix A Control Button Quick Reference Guide 60 Appendix B PLC and DCS Device Wiring 61 Appendix C Function Code 16 Registers 63 ...

Страница 6: ...lay 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 XL 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 contr...

Страница 7: ...s Detection Range Hydrogen Sulfide 0 100 ppm 1 ppm increments Alarm Settings Alarm 1 Alarm 2 10 ppm 50 ppm 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 ohms impedance max 24 VDC 1000 ohms impedance max RS 485 Modbus Ope...

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 XL 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 XL transmitter Figure 1 M2A XL External Components Terminal Stri...

Страница 9: ...e M2A XL 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 be in...

Страница 10: ...in the detector housing 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 dete...

Страница 11: ...ector A fitting at the bottom of the calibration adapter splash guard allows a length of tubing to be connected for calibration and routed to a more easily accessible location near the M2A XL junction box is optimal for 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 ro...

Страница 12: ... standoffs and rests on a thin layer of foam A banana jack is screwed into each of the standoffs and used for mounting the control PCB The terminal PCB converts the electrical output from the detector to a signal which can be displayed by the OLED display a 4 20 mA signal that is proportional to the detection range and an RS 485 Modbus output signal The 4 20 mA signal may be used by a recording de...

Страница 13: ...erminal does not have to be connected for the M2A XL to function The S terminal is used if you want to connect the 4 20 mA output signal to another device such as a gas monitoring controller chart recorder or programmable controller PLC Detector Terminal Strip The detector terminal strip is a four position plug in style terminal strip and is the middle terminal strip in the left terminal column Th...

Страница 14: ...tem Ground Jumper A two pin header with a jumper installed is located along the left side of the terminal PCB Leave this jumper installed unless directed to remove it for a Modbus installation See Chapter 8 RS 485 Modbus Output on page 47 for a description of using the M2A XL in a Modbus system Control PCB The OLED display and control switches are located on the control PCB It is installed on top ...

Страница 15: ... same functions as the push button switches it is not practical to use them for operations other than calibration because it is not possible to actuate two magnetic switches at once with only one magnetic wand Since displaying the Information Screen only requires the use of one switch the wand may be used to show the Information Screen see Information Screen on page 26 Table 2 M2A XL Control Butto...

Страница 16: ...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 XL is experiencing an alarm 1 condition Alarm 2 LED The alarm 2 LED is on when the M2A XL is experiencing an alarm 2 condition RX TX LED s These LED s indicate data being received RX and transmitted TX when the M2A XL s Modbus output is operati...

Страница 17: ... 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 XL junction box s two mounting holes to secure the juncti...

Страница 18: ...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 XL junction box See the Chapter 9 Parts List on page 59 for available tubing 2 70 38 Calibration Adapter Splash Guard H2S Detector Ø3 65 3 4 Conduit Hub 11 60 Max 5 25 1 13 Rubber Spacer 3X ...

Страница 19: ...If desired the control PCB may be disconnected from the cable 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 XL junction box s NEMA 4X environmental rating and prevent water from entering the junction box...

Страница 20: ...erminal 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 strip may be removed by grasping them with your fingers if the adjacent terminal strips have been removed 14 Pull out the detector terminal strip and connect the two wires to the terminal strip as f...

Страница 21: ...hassis earth ground at the M2A XL junction box Do not connect the shield drain wire at the detector junction box Install conduit seal within 2 inches T O XI C O XY P W R S IG S C NC NO A L AR M 1 C NC NO A L AR M 2 C NC NO F AI L Red Detector Terminal Strip Black Red Cable Shield H2S Detector Calibration Adapter Splash Guard Detector J Box Black Install conduit seal within 2 inches for Group B env...

Страница 22: ... the M2A XL 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 from ent...

Страница 23: ...ut on page 47 See Figure 9 below for field wiring connections to the M2A XL Figure 9 Wiring the M2A XL 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 XL junction box cover to the junction box 5 Ma...

Страница 24: ...alibration on page 41 Verify that the M2A XL 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 hydrogen sulfide 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 setting...

Страница 25: ...fferent time out period see Viewing Changing M2A XL Parameters on page 31 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 second...

Страница 26: ...Information Screen displays the M2A XL 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 XL The se...

Страница 27: ...nue 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 XL 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 XL returns to norm...

Страница 28: ...ts 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 alarm 2...

Страница 29: ...es an alarm 2 condition The M2A XL 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 XL 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 Con...

Страница 30: ...lts or less WARNING While in a low power condition the M2A XL is not an active gas monitor When the M2A XL 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 using...

Страница 31: ...old the UP YES and ENTER buttons for 5 seconds to enter Configuration Mode Release the buttons when the following screen appears 2 If you want to exit Configuration Mode press and release the DOWN NO button and the M2A XL will return to normal operation If you want to continue in Configuration Mode press and release the UP YES button The target gas and the full scale will be displayed for a few se...

Страница 32: ...s This parameter appears only if the alarm 1 relay reset setting is set to SELF RST It can be set in 1 sec ond increments from 0 60 seconds in 1 minute increments from 1 15 minutes and in 15 minute increments from 15 60 minutes ALARM 2 level 50 ppm The gas reading at which the M2A XL initiates an alarm 2 condition ALARM 2 activation Increase Indicates if the alarm 2 circuit is activated by gas rea...

Страница 33: ...rom 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 XL will dis play a reading of 0 ppm for gas readings from 2 ppm to 2 ppm It is settable from 0 to 6 of the detection range FILTER 5 secs The filter feature helps smooth out jumpy or...

Страница 34: ...s 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 XL will return to normal operation If you want to continue...

Страница 35: ...rget gas and the detection range for a few seconds and then the M2A XL 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 5 Conf...

Страница 36: ... desired 9 After the M2A XL 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 XL 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 require...

Страница 37: ...s probable causes and recommended action for problems you may encounter with the M2A XL NOTE This troubleshooting guide describes M2A XL problems only If the M2A XL is connected to a controller see the controller operator s manual for problems you may encounter with the controller Table 7 Troubleshooting the Carbon Monoxide Detector Condition Symptom s Probable Causes Recommended Action No Power T...

Страница 38: ...hielded See Wiring the M2A XL Transmitter on page 19 2 Verify that the detector wiring is correct and secure 3 Increase the filter setting in Configuration Mode 4 Increase the zero suppression setting in Configuration Mode 5 If the display difficulties continue contact RKI for further instruction Fail Condi tion M2A XL indicates a fail condition Controllerindicates a fail condition The detector wi...

Страница 39: ...reading during calibration M2A XL requires frequent calibration NOTE See Calibration Frequency on page 39 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 calibration ...

Страница 40: ...h guard to connect the regulator to the calibration adapter splash guard 5 Turn the regulator s on off knob counterclockwise to open the regulator Gas will begin to flow Take note of the time or start a stopwatch 6 When you first start to notice an increase in the gas reading note how much time passed between starting the gas flow and noticing a reading response 7 Turn the regulator s on off knob ...

Страница 41: ...hile in the calibration program if there is no switch activity for the calibration time out period the unit will return to normal operation See Viewing Changing M2A XL Parameters on page 31 for instructions to set the calibration time out NOTE The following procedure assumes that the target gas is present in a high enough concentration to affect the fresh air zero reading If a fresh air environmen...

Страница 42: ...tinue with calibration press and release the UP YES button The display will indicate the target gas and CAL Mode for a few seconds before showing FreshAir Adjust If you want to exit Calibration Mode press and release the DOWN NO button The M2A XL will indicate Leaving CAL Mode and the M2A XL will return to normal operation 3 To continue with adjusting the fresh air reading press and release the UP...

Страница 43: ...cylinder and degrading the gas Open the regulator by turning the knob counterclockwise 3 Install the regulator onto the cylinder 4 Allow calibration gas to flow for the length of time determined in Determining Response Time on page 40 5 Turn the regulator knob clockwise to close it 6 Unscrew the calibration gas cylinder from the fixed flow regulator The M2A XL will continue to display the maximum ...

Страница 44: ...onents of the H2S Detector This section includes a procedure to replace the H2S plug in sensor and the entire detector assembly In most cases it is not necessary to replace the entire detector assembly Replacing the Plug In H2S Sensor CAUTION The sensor contains electrolyte which is a dilute acid Do not disassemble the sensor when replacing it with a new one If sensor electrolyte comes in contact ...

Страница 45: ...he H2S Detector NOTE In most cases it is only necessary to replace the plug in H2S sensor 1 Turn off or unplug power to the M2A XL 2 Remove the detector junction box cover 3 Unscrew the calibration adapter splash guard from the detector housing cap 4 Disconnect the detector leads from the terminal block in the detector junction box Note the position of the color coded leads as you remove them 5 Un...

Страница 46: ...einstall the detector junction box cover 10 Turn on or plug in power to the M2A XL 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 47: ... slave addresses 1 247 The M2A XL s line driver provides for up to 128 M2A XLs to be connected together without the need for a repeater Figure 13 Figure 14 below illustrate typical M2A XL wiring configurations If more than 128 M2A XLs need to be connected together RS 485 repeater s should be used such that no more than 128 M2A XLs reside on any given network segment CAUTION The network segment can...

Страница 48: ...configuration 5 wires are used for wiring the M2A XL 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 XL to an Existing M2 Modbus Installation with Recommended Wiring An M2A XL can be wired into an existing M2 Modbus system The shape of the terminal PCB will b...

Страница 49: ...nal 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 XL to an Existing M2 Modbus Installation with Alternate Wiring An M2A XL can be wired into an existing M2 Modbus system The shape of the terminal P...

Страница 50: ...ination jumper removed see Figure 13 Figure 14 below Figure 13 Multiple M2A XLs in a Daisy Chain Configuration Figure 14 Multiple M2A XLs 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 Ju...

Страница 51: ...A XL automatically returns to normal operation NOTE If the M2A XL 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 relea...

Страница 52: ... to normal operation NOTE All M2A XLs on a Modbus network must be configured with the same baud rate and parity and each M2A XL must have a unique slave ID For an M2A XL 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 settin...

Страница 53: ...gisters 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 12 Ope...

Страница 54: ... 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 Energized T...

Страница 55: ...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 the alarm ...

Страница 56: ...conds 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 Register 36 Register 36 is calibration month upper byte and...

Страница 57: ...r access level 0 None 1 Alarm Reset Function Code 16 Write Registers There are 21 registers in Function Code 16 that can be used to write to the M2A XL This manual only describes Register 16 because it can be used to reset an alarm condition For a complete description of Function Code 16 see Appendix C Function Code 16 Registers on page 63 Register 16 Register 16 performs the same function as the ...

Страница 58: ...58 Chapter 8 RS 485 Modbus Output 65 2662XL 04 M2A XL Transmitter ...

Страница 59: ...includes sensor CSA version 71 0616 65 2662XL 04 M2A XL 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 0151RK 02 Calibration cylinder H2S 25 ppm in nitrogen 58 liter 81 0151RK 04 Calibration cylinder H2S 25 ppm in nitrogen 34 liter aluminum 81 1050RK Regulator with gauge and knob 0 5 lit...

Страница 60: ...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 XL 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 Configu...

Страница 61: ...trip If the PWR SIG terminal strip connections and one or more relays are used route the connections to the M2A XL 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 for the ...

Страница 62: ...XL 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 63: ... 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 an inte...

Страница 64: ...econds 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 Supported Modb...

Страница 65: ...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 Configuration Ch...

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