Siemens SIMATIC S7-300 Reference Manual page 470

Parameters stored in data records
The parameters of the signal modules are located in data records 0 and 1; for
some other analog input modules, in data record 128 as well.
Modifiable parameters
You can change the parameters of record 1 and pass them to the signal module
using SFC 55. The parameters set on the CPU are not changed when you do this!
You cannot modify the parameters of data record 0 in the user program.
SFCs for parameter assignment
The following SFCs are available for assigning parameters to the signal modules in
the user program:
Table A-1
SFC
No.
55
56
57
Description of the parameters
The following sections contain all the modifiable parameters for the various module
classes. The parameters of the signal modules are described:
• In the on-line help of STEP 7
• In this reference manual
You will find the parameters that can be adjusted for the signal module
concerned in the specific sections for the different signal modules.
Further references
An in-depth description of the principle of assigning parameters to signal modules
in the user program and a description of the SFCs that can be used for that
purpose will be found in the STEP 7 manuals.
A-2
SFCs for assigning Parameters to Signal Modules
Identifier
WR_PARM Transfer modifiable parameters (data record 1 and 28)
to the addressed signal module.
WR_DPARM Transfer parameters (data record 0, 1 or 128) from the
CPU to the addressed signal module.
PARM_MOD Transfer all parameters (data record 0, 1 and 128)
from the CPU to the addressed signal module.
Application
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03