• Test the safety function again after the change. Do the start-up
and acceptance test of the safety function.
• Document the tests and store the report into the logbook of the
machine.
Proof test interval
After the operation of the safety function is validated at start-up, the
safety function must be maintained by periodic proof testing. In high
demand mode of operation, the maximum proof test interval is 20
years. In low demand mode of operation, the maximum proof test
interval is 2 years (high or low demand as defined in IEC 61508,
EN/IEC 62061 and EN ISO 13849-1). Regardless of the mode of
operation, it is a good practice to check the operation of the safety
function at least once a year.
The person responsible for the design of the complete safety function
should also note the Recommendation of Use CNB/M/11.050
published by the European co-ordination of Notified Bodies concerning
dual-channel safety-related systems with electromechanical outputs:
• When the safety integrity requirement for the safety function is
SIL 3 or PL e (cat. 3 or 4), the proof test for the function must be
performed at least every month.
• When the safety integrity requirement for the safety function is
SIL 2 (HFT = 1) or PL d (cat. 3), the proof test for the function
must be performed at least every 12 months.
This is a recommendation and depends on the required (not achieved)
SIL/PL. For example, contactors, breakers, safety relays, contactor
relays, emergency stop buttons, switches etc. are typically safety
devices which contain electromechanical outputs. The FPTC-02 and
FSO modules and the STO circuit of the drive do not contain
electromechanical outputs.
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