I/O Modules (Fm, Cp Modules) - Siemens SINUMERIK 828D Function Manual

P3: Basic PLC Program for SINUMERIK 840D sl
13.5 Starting up the PLC program
However, it is normally sufficient to recompile the organization blocks (OBs) and the instance data blocks of the
S7 project. This means before upgrading, only the sources for the organization blocks and the instance data
blocks have to be generated.
NC tags
The latest NC VAR selector can be used for each NC software version (even earlier versions). The variables can
also be selected from the latest list for earlier NC software versions. The data content in DB 120 (default DB for
variables) does not depend on the software status. That is, variables selected in an older software version need
not be reselected when the software is upgraded.
13.5.8

I/O modules (FM, CP modules)

Special packages for STEP 7 are generally required for more complex I/O modules. Some of these special
packages include support blocks (FCs, FBs) stored in a STEP7 library. The blocks contain functions for operating
the relevant module which are parameterized and called by the user program. In many cases, the FC numbers
for the CP and FM module handling blocks are also included in the number range of the basic program for the
840D.
What can one do in these conflicts?
The block number of the basic program must remain unchanged. The block numbers of required handling blocks
can be assigned to free numbers using STEP 7. These new blocks (with new FC numbers) are then called in the
user program with the parameter assignments required by the function.
Basic Functions
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0