Changes In Cfc - Siemens SIMATIC PCS 7 Operating Manual

Changes, tracking changes, and acceptance

9.3 Changes in CFC

Checking the hardware before downloading
Before downloading the changes - and in particular, before downloading hardware
configuration changes with HCiR - make sure that no errors are present in the system.
● The HCiR procedure involves stopping a CPU, performing the download, and then
restarting the CPU.
● Immediately after the transition to RUN Redundant, the other CPU is stopped and
restarted, during which time it is updated to the current configuration.
● If there is an error in a redundant component (e.g. the interface module of the ET 200M),
this can cause the connection to a PROFIBUS slave to fail and input/output modules to
be passivated.
9.3 Changes in CFC
Changing the user program
Before you make changes to the standard or fail-safe program of an S7 F/FH systems, make
sure that you can also download and check these changes. Changes to the standard or fail-
safe program cannot be compiled or downloaded as part of a separate process. Therefore,
you must follow the sequence below in full to make changes:
● Change CFC
● Check
● Compile
● Download
● Offline/online comparison
● Test
● Document
To change or add a fail-safe function, open the relevant CFC or add a new one.
Runtime groups
When a new CFC is added, the system creates a new runtime group with the same name.
Check whether its insert position in the editor is the position you require.
When deleting safety functions, empty F-runtime groups may arise, which also have to be
deleted. To do this with PCS 7 V7.0 and higher, execute the following command in the CFC
editor: "Edit > Delete Empty Runtime Groups".
With PCS 7 V6.1, activate the option "Delete Empty Runtime Groups" when compiling.
Before inserting blocks, establish the predecessor block. When inserting blocks, make sure
that the sequence of the blocks corresponds to the signal flow. If necessary, change the
block sequence in the runtime editor. The "Optimize run sequence" function does not
optimize F-runtime groups. These are excluded from optimization.
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Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB