Access Commands For Distributed I/O - Siemens SIMATIC S5 Manual

9.1.4

Access commands for distributed I/O

Overview You can access the addresses of the distributed I/O as follows:
Process image or
You cannot access inputs or outputs via the process image or load/transfer
load/transfer com-
commands unless you assigned the inputs and outputs beforehand with
mands
COM ET 200 Windows.
Appendix B contains a list of all the commands for the various CPUs and
address areas. Appendix B also contains a list of rules that you must observe
in order to maintain data consistency.
Mixed-mode ad-
You can mix the various modes of addressing to suit your application. Define
dressing
"Linear", "P-page" or "Q-page" as the addressing mode in the "Master
parameters" dialog box in COM ET 200 Windows. This mode then applies
for all DP slaves assigned to the DP master in question.
If you mix the modes of addressing linearily or mix page addressing with
FB IM308C, the following applies:
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
IM 308-C – addressing, diagnostics and use of the FB IM308C
Via the process image or with load/transfer commands
Via the standard function block FB IM308C
Inputs can be read either with the FB IM308C or by linear or page ad-
dressing.
If you have addressed outputs using linear or page addressing, you cannot
simultaneously use the FB IM308C to address these outputs.
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