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Safety Relay or Safety PLC — Which to Choose?

Choosing between a safety relay and a safety PLC by number of safety functions, required SIL/PL and flexibility.

4 min readUpdated: 2026-07-07

For a few (1-3) simple safety functions a safety relay is economical and sufficient. For many functions, complex logic or frequent changes, a safety PLC provides flexibility.

Safety relay
1-3 functions, fixed logic, cheap
Safety PLC
Many functions, programmable, scalable
In both cases the required SIL/PL must be set by risk analysis and the chosen component chain must meet it.

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