Common Parameters For Instructions - Siemens SIMATIC S7 System Manual

How to change IP parameters and PROFINET IO device names
In the following example, both the "addr" and "nos" (Name of station) subfields are changed.
In the CPU "Properties", "Ethernet address" page, the "Set PROFINET device name using a
different method" radio button must be clicked to enable you to change the PROFINET
device name using the "T_CONFIG" instruction after the program is downloaded.
Table 10- 28 How to change IP parameters and PROFINET IO device names
10.2.2.7

Common parameters for instructions

REQ input parameter
Many of the Open User Communication instructions use the REQ input to initiate the
operation on a low to high transition. The REQ input must be high (TRUE) for one execution
of an instruction, but the REQ input can remain TRUE for as long as desired. The instruction
does not initiate another operation until it has been executed with the REQ input FALSE so
that the instruction can reset the history state of the REQ input. This is required so that the
instruction can detect the low to high transition to initiate the next operation.
When you place one of these instructions in your program, STEP 7 prompts you to identify
the instance DB. Use a unique DB for each instruction call. This ensures that each
instruction properly handles inputs such as REQ.
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
103BCommunication
10.2 PROFINET
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