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Model 5100-28-IT Combustible Gas Sensor Module
Page: 44
8.7 APPENDIX G: MODBUS MEMORY MAP
Table 8 - 1: Modbus Memory
Map
Register Description Read/ Comments
Write
40001 Concentration R Gas concentration multiplied by Gas Scale (e.g. 209 = 20.9%)
40002 Temperature R Temperature in degrees Celcius scaled by a factor of 10
40003 Alarm Relay R/W
Boolean indicating the Alarm relay status (0 = No Alarm, 1 - (High) Alarm).
Clearing bit will reset alarm.
40004 Warning Rel ay R/W Boolean indicating the Warning relay status (0 = No Alarm, 1 - Warning Alarm). Cleari ng bit will reset alarm.
40005 Warning Setpoint R/W Warning Alarm set point, used for activating Low Alarm multiplied by Gas Scale
40006 Alarm Setpoi nt R/W Alarm set point, used for activating High Alarm multiplied by Gas Scale
40007 CCC detail R e.g. 0001, 0007, etc
40008 Software Revi sion U R e.g. 201 denotes version 2.01
40009 Software Revi sion L R e.g. version aA is denoted by 0x6141
40010 Modbus Map Revisi on R e.g. version 2 is denoted as v2 = 0x7602
40011 Trouble Bits R 0 = no trouble
40012 Trouble R 1 for any trouble, 0 = no trouble
40013 Alarm Immediate R Like 40003, but neve r latched
40014 Warning Immediate R Like 40004, but never latched
40015 Serial Number U R Serial Number - 24 bits (presently set to Random ID)
40016 Serial Number L R
40017 Run time U R In seconds
40018 Run time L R In seconds
40019 Gas (MAX) value R Gas concentration multiplied by Gas Scale
40020 Model R Read as 51028 for IR, 51002 for Cat Bead, 51005 for TOXIC H2S etc.
40021 Range RW
40022 Units RW 1 = %LEL, 2 = %VOL
40023 Modul e Status R
A bit is defined for each of the following states:
(no bit set also means some sort of trouble)
Module State - In Calibration (0x40) = cal failed
Module State - In Calibration (0x20) = cal passed
Module State - In Calibration (0x10)
Module State - Trouble (0x08)
Module State - Warming (0x04)
Module State - RUN (ALARM) (0x02)
Module State - RUN (0x01)
40024 Gas Scale R Value like 1, 10 or 100
40025 Cal Concentration level R/W Gas concentration value used during calibration, multipli ed by Gas Scale
40026 Calibration due, in days R Gets reset to 365 / 180 if cal successful, Less then 0 = calibration due
40027 Calibration Count R Counter increments if cal succe ssf ul (0 = not calibrate d)
40028 Display Gas Output R Gas value seen on display (i .e. useful during calibration)
40029 Gas (MIN) value R Minimum gas value multiplied by Gas Scale
40030 Alarm Time U R In seconds
40031 Alarm Time L R
40032 Warning Time U R In seconds
40033 Warning Time L R
40034 Trouble Time U R In seconds
40035 Trouble Time L R
40036 Max Gas Time U R In seconds
40037 Max Gas Time L R
40038 Min Gas Time U R In seconds
40039 Min Gas Time L R
40040 Rotary Switch R Module address (If value < 16, the value refl ects position of rotary switch)
40041 Restart Count R Restart count
40042 Alarm Relay Action Setup RW Alarm Relay Action Setup - Latch/Sentry/Non-latch
40043 Warning Rel ay Action Setup RW Warning Relay Action Setup - Latch/Sentry/Non-latch
40044 4-20mA CalibOut Value R
40045 4-20mA TroubleOut Value R
40046 Gas Factor RW Applies only to -02
40047 Force V alue RW
40048 Modul e Number RW
40049 Command Register RW
0 indicates command failed, 1 = passed, supported commands:
Lock keys = 101
Unlock keys = 102
Abort calibration = 103
Apply zero gas = 104
Apply span gas = 105
Ack alarms = 106
Reset sensor = 107
Cl ear mem = 108
Speed up startup = 109
Clear eeprom = 110
Force address disp= 111
Clear address disp= 112
40050 Last command executed R Displays last executed command from register 40049
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