Configuring and Parameterizing
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Read/ Write Extension
Use case:
Connection of Modbus RTU Servers with more than 12 registers, which have to be read or written.
Extension of the read or write command to a Modbus RTU Server, which has been configured in
the preceding SCB.
Fig. 71: Example – write extension
Parameters 1st SCB
Value
Meaning
Server address
1
Address of the Modbus RTU Server from which data
have to be read
Number reg. read access
12
Number of registers to be read
Read access
read input registers
(FC 4)
Start address for read
access
30001
Address of the 1st register which has to be read.
Parameters 2nd SCB
Value
Meaning
Server address
0
Not defined, automatically set
Number reg. read access
12
Number of registers to be read additionally
Read access
Write extension
Defines this SCB as extension for the preceding SCB.
Start address for read
access
0
Not defined, automatically set
Start address for read
access
0
1. SCB
write extension
