Fundamentals - Siemens SINUMERIK 840D sl Function Manual

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Fundamentals

These signals must be logically combined (interlocked) in a safety-related, freely

programmable form in order to be able to flexibly process safety-related external process

signals and safety-related internal input and output signals. The "Safe Programmable Logic"

(SPL) handles this task as an integral system component.

● Logic operations implemented by the user are cyclically processed.

● Instructions are effective in all operating modes.

● The PLC program immediately starts to execute the instructions after the control has booted.

● The SGE/SGA must be supplied by the machine manufacturer - both in the drive monitoring

channel as well as in the NCK monitoring channel.

● The NCK-SPL is written as ASUB using the synchronized actions CNC function. The PLC-

SPL is written as PLC user program.

In order to check that the two SPLs (PLC and NCK) are functioning, the system program

arranges cyclic data comparison between the PLC and NCK.

Safety Integrated

Function Manual, 12/2017, 6FC5397-4BP40-6BA1

Safe programmable logic

Connecting sensors and actuators

8.5 Safe programmable logic