Communication processor and Modbus TCP
13.5 Modbus communication
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1169
As of version V4.1 of the S7-1200 CPU together with STEP 7 V13 SP1, the CPU extends the
capability of Modbus TCP to use enhanced T-block instructions.
For this reason, the S7-1200 supports two sets of PtP instructions:
● Legacy Modbus TCP instructions (Page 1250): These Modbus TCP instructions existed
prior to version V4.0 of the S7-1200.
● Modbus TCP instructions (Page 1171): These Modbus TCP instructions provide all of the
functionality of the legacy instructions.
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