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Siemens SIMATIC S7-1200 Sicherheitsprogrammierung Manualline

3 Methods for Safety Programming

3.1.2

Call levels of F-FBs/F-FCs

For standard user programs, the number of call levels is limited depending on the

CPU. For safety programs, you can use a maximum of eight call levels. A warning

appears when this limit is exceeded and an error message is displayed for pure FC

and multi-instance call chains.

System instructions ("ESTOP1", "SF_DOOR", etc.) are not included in the number

of call levels.

Note

On the system side, functions are mapped as FBs with a multi-instance call in

the protection program; this is the reason why an error message is also

displayed for FC call chains with more than eight call levels.

The program structure in

relatively flat so that the safety program remains within the limit specified here.

3.1.3

Call sequence of the blocks in the Main Safety

Recommendation

Within the Main Safety, call blocks in the following sequence:

1. Receive blocks from other CPUs (F-CPU-F-CPU communication)

2. Error acknowledgment/reintegration of F-modules/F-channels

3. Evaluation block of the sensors

4. Operating mode evaluation

5. Logic operations, calculations, evaluations, etc.

6. Control blocks for safe actuators

7. Send blocks to other CPUs (F-CPU-F-CPU communication)

Safety Programming Guideline

Entry ID: 109750255,

V1.0,

Figure 3-1

10/2017

shows one way of keeping the call levels