Appendix
A.3 Application examples for functional safety (STO / SS1-t)
Power Module PM330
Hardware Installation Manual, 12/2018, A5E32844552B AF
131
● LED 1 DEVICE is OFF
-> fault
● LED 2 OUT is OFF
-> the safety circuit is not enabled
● 3SK1 power supply missing
● Short or cross-circuit faults at the 3SK1
– Between the cycle outputs
– In or to the power supply
– In the input circuit (sensor circuit)
– In the enable circuits
– In the feedback signal circuit
Safety relay 3SK1 Advanced or 3SK1112… being used
Scenario 3:
● LED 1 DEVICE lights up green
– -> power supply, power up and configuration are OK
● LED 2 OUT is OFF
– -> the safety circuit is not enabled
● LED 3 IN is OFF
-> close sensor circuit through 2 channels
● LED 3 IN flashes green
– LED 4 SF is OFF -> START button not pressed
– LED 4 SF flashes red-> simultaneity for 1x2 channel sensor not met
– LED 4 SF flashes red-> time monitoring for two-handed start violated
● LED 3 IN flashes yellow
– LED 4 SF flashes red -> short-circuit T1/T2 with respect to ground or 24 V
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