Test inputs #SBC-A and #SBC-B separately from each other and together. The diagnostic feedback
may only be high level when both inputs #SBC-A and #SBC-B are requested. If the signal behaviour
does not correspond to expectations, the system must be transferred into a safe condition within the
reaction time. Time monitoring must be planned in the safety relay unit.
Testing of the SBC safety function with feedback over SBA is required at least 1x within 24 h.
•
Check SBA feedback dependent on the level SBC-A and SBC-B according to the following table.
#SBC-A (BR+)
#SBC-B (BR-Ext)
SBA
Low level
Low level
High level
Low level
High level
Low level
High level
Low level
Low level
High level
High level
Low level
Tab. 4 Check of all SBC levels
Evaluation of SBA
Recommendation: evaluation with every actuation.
•
Check SBA feedback at every request.
#SBC-A (BR+)
#SBC-B (BR-Ext)
SBA
Low level
Low level
High level
High level
High level
Low level
Tab. 5 Evaluation of SBC level
Timing SBC
Product overview
13
Festo — CMMT-AS-...-S1 — 2018-02