Commissioning and maintenance

Commissioning

Before the system is put into operation the safety functions must be tested/validated.

The STO-SBC function shall be activated/deactivated and the reactions shall be monitored (the reaction depends if used as emergency stop or prevention of unexpected start-up or another safety function).

  1. Safety wiring diagrams and the commissioning test shall be documented and stored (who,what,when)

  2. Define maintenance routines according to the need (see chapter maintenance)

Maintenance

IEC 61800-5-2:2016 requires to have a maintenance test for STO-SBC function. The frequency of testing depends on the required safety level:

  • one test per year for SIL 2 , PL d / category 3

  • one test per three months for SIL 3 , PL e / category 3

The maintenance test can be done by activating STO/SBC function through STO-SBC inputs and observe the reaction of the system.