Siemens SINUMERIK 840D sl Function Manual page 276

Safety integrated

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Connecting sensors and actuators

8.5 Safe programmable logic

; End of program

These instructions simulate the output interfaces of the NCK-SPL and therefore "short-circuit"

the crosswise data comparison.

Commissioning

The logic used in this phase has a single channel structure and is therefore not safe!

The described minimum NCK-SPL must be replaced by a full NCK-SPL without any access

to $A_INSIP(D), ..., $A_MARKERSIP(D) when the PLC side is completed!

Additional diagnostic support:

● $A_STATSID: A value not equal to 0 means that an error has occurred in the crosswise

data comparison.

● $A_CMDSI[n]: n=1: 10x change timer value for long forced checking procedure pulses and/

or single-channel test stop logic.

● $A_LEVELSID: Indicates how many signals have different signal levels on the NCK and

PLC sides that can be presently detected.

● In addition, other NC variables or free R parameters can be written to monitor internal states

The following applies to all system variables of the NCK-SPL outputs: They can be written from

and read back to the SPL program.