Modbus Registers - Emerson Net Safety Millennium II Reference Manual

Monitoring and outputs
June 2016
6.4.1

Modbus registers

Reg# Meaning
40001 Concentration value as calculated by sensor (RTUsensor_out), Channel 1
40002 Sensor status (RTUsensor_stat), Channel 1
40003 Temperature of sensor element housing in Kelvin (RTU temperature), Channel 1
40004 RFU, Channel 1, always read as 0x0000
40005 RFU, Channel 1, always read as 0x0000
40006 Concentration value as calculated by sensor (RTUsensor_out), Channel 2
40007 Sensor status (RTUsensor_stat), Channel 2
40008 Temperature of sensor element housing in Kelvin (RTU temperature), Channel 2
40009 RFU, Channel 2, always read as 0x0000
40010 RFU, Channel 2, always read as 0x0000
**40021 Transmitter Status
40091 Initialize Quick calibration, channel 1 to 2
40092 Initialize Normal Calibration, channel 1 to 2
40093 Channel 1 high alarm limit
40094 Channel 1 low alarm limit
40095 Channel 2 high alarm limit
40096 Channel 2 low alarm limit
40101 Reset latch relays
RFU – Reserved for future use
** The transmitter Status register (Register 40021) is a bit flag register. The following table shows the detailed meaning
of each bit in the register.
Bit Meaning
0x0000 Normal Sensor operation – no fault or alarm has happened
0x0001 Channel 1 sensor fault status tripped. Communication Fault, Calibration Fault, etc
0x0002 Channel 1 Low Alarm tripped
0x0004 Channel 1 High Alarm tripped
0x0008 Channel 2 sensor fault status tripped. Communication Fault, Calibration Fault, etc
0x0010 Channel 2 Low Alarm tripped
0x0020 Channel 2 High Alarm tripped
0x0040 Channel 1 needs Calibration
0x0080 Channel 2 needs Calibration
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NOTE: Alarm points can be set up through Modbus registers 40093 to 40096
Reference Manual
MAN-0076, Revision 09
Readable Writeable
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Monitoring and outputs