Table 7: Modbus Registers

Reg#

Meaning

Readable

 

Writeable

40001

Concentration value as calculated by sensor

X

 

 

 

(RTUsensor_out), Channel 1

 

 

 

40002

Sensor status (RTUsensor_stat), Channel 1

X

 

 

40003

Temperature of sensor element housing in Kelvin

X

 

 

 

(RTU temperature), Channel 1

 

 

 

40004

RFU, Channel 1, always read as 0x0000

X

 

 

40005

RFU, Channel 1, always read as 0x0000

X

 

 

40006

Concentration value as calculated by sensor

X

 

 

 

(RTUsensor_out), Channel 2

 

 

 

40007

Sensor status (RTUsensor_stat), Channel 2

X

 

 

40008

Temperature of sensor element housing in Kelvin

X

 

 

 

(RTU temperature), Channel 2

 

 

 

40009

RFU, Channel 2, always read as 0x0000

X

 

 

40010

RFU, Channel 2, always read as 0x0000

X

 

 

40011

Concentration value as calculated by sensor

X

 

 

 

(RTUsensor_out), Channel 3

 

 

 

40012

Sensor status (RTUsensor_stat), Channel 3

X

 

 

40013

Temperature of sensor element housing in Kelvin

X

 

 

 

(RTU temperature), Channel 3

 

 

 

40014

RFU, Channel 3, always read as 0x0000

 

 

 

40015

RFU, Channel 3, always read as 0x0000

 

 

 

40016

Concentration value as calculated by sensor

X

 

 

 

(RTUsensor_out), Channel 4

 

 

 

40017

Sensor status (RTUsensor_stat), Channel 4

X

 

 

40018

Temperature of sensor element housing in Kelvin

X

 

 

 

(RTU temperature), Channel 4

 

 

 

40019

RFU, Channel 4, always read as 0x0000

X

 

 

40020

RFU, Channel 4, always read as 0x0000

X

 

 

**40021

Transmitter Status

X

 

 

40022 To 40090

RFU

 

 

 

40091

Initialize Quick calibration, channel 1 to 4

X

 

X

40092

Initialize Normal Calibration, channel 1 to 4

X

 

X

NOTE: Alarm points can be set up through MPDBUS registers 40093 to 40096

 

40093

Channel 1 high alarm limit

X

 

X

40094

Channel 1 low alarm limit

X

 

X

40095

Channel 2 high alarm limit

X

 

X

40096

Channel 2 low alarm limit

X

 

X

40097

RFU, Channel 3 high alarm limit

X

 

X

40098

RFU, Channel 3 low alarm limit

X

 

X

40099

RFU, Channel 4 high alarm limit

X

 

X

40100

RFU, Channel 4 low alarm limit

X

 

X

40101

Reset latch relays

 

 

X

*RFU – Reserved for future use

**The transmitter Status register (Register 40021) is a bit flag register. Table 8 on next page, shows the detailed meaning of each bit in the register.

38

MAN-0076 Rev 05 Millennium II December 07, 2012

Net Safety Monitoring Inc

Page 38
Image 38
Emerson M22, M21 user manual Reg# Meaning Readable Writeable

M22, M21 specifications

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