Safe Software Relay - Siemens SINUMERIK 840D sl Function Manual

8.5.8

Safe software relay

General
The standard SPL block "safety software relay" is designed to meet the requirements of an
Emergency Stop function with safe programmable logic. However, it can also be used to
implement other similar safety functions, e.g. to control a protective door.
Figure 8-34
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Function diagram of the safety relay
Connecting sensors and actuators
8.5 Safe programmable logic
277