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S7-300 Module data

Manual, 06/2017, A5E00105505-AJ

522

Parameter sets of signal modules

A.1 Principles of programming signal modules in the user program

Parameter assignment in the user program

You have programmed the modules in

STEP 7

In the user program, you can use a SFC:

● to assign new parameters to the module, and

● transfer the parameters from the CPU to the addressed signal module

Parameters are stored in data records

The signal module parameters are written to data records 0 and 1; for certain analog input

modules, these are also written to data record 128.

Editable parameters

You can edit the parameters of data record 1, and then transfer these to the signal module

using SFC55. The CPU parameters are not changed by this action!

You cannot modify any parameters of data record 0 in the user program.

SFCs for programming

SFCs available for programming signal modules in the user program:

Table A- 1 SFCs for programming signal modules

SFC no.

Identifier

Application

55 WR_PARM Transfer the programmable parameters (data record 1 and 28) to the addressed

signal module.

56 WR_DPARM Transfer the parameters (data record 0, 1

128) from the CPU to the addressed

signal module.

57 PARM_MOD Transfer all parameters (data record 0, 1

and

128) from the CPU to the addressed

signal module.

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