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2 Description of the safety function STO
Festo – GDCP-CMMS-AS-G2-S1-EN – 1306NH – English 27
Delay time of the PNOZ s5 from Pilz
The delay time of the PNOZ s5 from Pilz must be set greater than the determined brake time; see calcu-
lation example. Otherwise, the drive would not brake in the defined manner, but would run out uncon-
trolled.
2.5 Testing the safety function
At each On-Off cycle of the machine, the safety switching devices PNOZ from Pilz check whether the
relays of the safety device open and close properly.
Since the safety switching devices can check all required functions only during activation and request of
the safety function, the safety function must be activated regularly and its function checked.
In addition, the “Acknowledgment of driver supply” signal must be checked for plausibility.