S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
A-1
A Parameter sets of signal modules
A
A.1 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 modifiable parameters (data record 1 and 28) to the addressed signal
module.
56 WR_DPARM Transfer parameters (data record 0, 1 or 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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