Interfaces to automation systems
8.2 Modbus interface
SITRANS SL
Operating Instructions, 12/2010, A5E01132948-04
137
8.2.2
SITRANS SL Modbus map for gas measurement
Information from the SITRANS SL can be transferred to a PC/PG via the Modbus.
Measurement values, status signals and also signals of analog and digital inputs and outputs
are thus available for further usage.
Overview of used register numbers (Standard Modbus)
Modicon-modbus-
address
Type
Data Address
Description
30001
Input Register (R)
0
Process data
30101
Input Register (R)
100
Device Status
40001
Holding Register (R+W)
0
Input process data
Example
The first Holding Register, number 40001, has the Data Address 0000. Offset is 1.
Overview of used register numbers (Enron Modbus)
Modicon-modbus-
address
Variable type
Data Address
Description
3001
16 bit Short integer (R+W) 3000
Process data
5001
32 bit Long integer (R+W)
5000
Process data
7001
32 bit Floating point (R+W) 7000
Process data