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Interfaces to automation systems
8.2 Modbus interface
SITRANS SL
Operating Instructions, 12/2010, A5E01132948-04
145
Modbus addresses 5000 ... 5999
Long Integer registers
Access to long integer data is an extension of the Gould Modbus ASCII protocol. Long
Integer registers are read using function code 03
Table 8- 9
Long Integer registers
Enron
Modbus
address
Access
Data Address
Description
5001
read
5000
Component 1 – Concentration
Alarm
5002
read
5001
Component 1 – Transmission
Alarm
5003
read
5002
Component 3 – Pressure
Alarm
5004
read
5003
Component 4 – Temperature
Alarm
5101
read
5100
Component 1 – Concentration
Measurement counter
5102
read
5101
Component 1 – Transmission
Measurement counter
5103
read
5102
Component 3 – Pressure
Measurement counter
5104
read
5103
Component 4 – Temperature
Measurement counter
Modbus addresses 7000 ... 7999
Floating Point registers
Access to floating point data is an extension of the Gould Modbus ASCII protocol. Floating
point registers are read using function code 03 or set using function code 16.
Table 8- 10 Floating Point registers
Modicon-
modbus-
address
Type
Data Address
Description
7001
read
7000
Component 1 – Concentration value
7002
read
7001
Component 2 – Transmission value
7003
read
7002
Component 3 – Pressure output value
7004
read
7003
Component 4 – Temperature output value
7101
write
7100
Component 1 – Pressure input value
7102
write
7101
Component 1 – Temperature input value