Modbus Registers - Emerson Net Safety SC311 Reference Manual

Reference Manual
00809-0100-4311
4 Output
4.1 Alarm and fault outputs
Sensor alarm and fault outputs are generated by the Net Safety
transmitters based on communication with sensors; however, some output values,
registers, etc. may vary depending on sensor type. The default alarm levels (points) for the
sensor are: 20 percent for the low level and 40 percent for the high level.
4.1.1 Other available outputs
All available outputs are associated with the Net Safety
These outputs are: 4-20 mA output, relay output, RS 485 Modbus
HART
Reference Manual
Manual
4.1.2

Modbus registers

Table 4-1
Table 4-1: Modbus Registers
Register #
40001
40002
40003
40009
40101
40102
40104
(1) To calibrate sensor, enter channel number.
(2) To zero sensor, enter channel number.
Note
For the Net Safety
the sensor and 1 in register 40104 to zero the sensor.
Net Safety SC311
®
communication output. Refer to the Net Safety Millennium II Basic Transmitter
or the Net Safety Millennium II Multichannel Transmitter
for more information.
below shows the user accessible Modbus registers and meaning.
Meaning
Concentration value as calculated by
sensor
Sensor status
Sensor temperature
Select target gas
Resets the sensor
Initialize zero & span
(2)
Zero only
™
Millennium II Basic Transmitter enter 1 in register 40102 to calibrate
™
Millennium II series transmitters.
Readable
X
X
X
X
(1)
Output
May 2019
™
Millennium II series
®
(RTU) output and
Reference
Writeable
X
X
X
X
15