Operating Instructions
Modular Safety Control System MSC
86
(Translation of the original operating instructions) 2121331-04-04/19
Example of usage with an external relay Example of usage with only an internal relay
Figure 74: Examples of usage
Category 2. Outputs with a category 2 relay with OTE (Output Test Equipment) outputs. Each module AZ-FO4 / AZFO4O8
can have up to four of these outputs.
OTE: The OTE (Output Testing Equipment) output is normally "1" (TRUE), except if there is an internal error or a malfunction
in conjunction with the feedback loop for external contactors (FALSE).
Properties:
Ì Internal relays are always monitored.
Ì Monitored external device monitoring contacts (EDM).
Ì The output can be configured for a manual or automatic restart. The external device monitoring (EDM) cannot be activat-
ed with a manual start, only with an automatic start. If, however, a manual start is required with external device monitor-
ing, special logic must be used. (See information below)
Figure 75: Relay output cat. 2
Output for external K time monitoring
Ì Enable: This is necessary for category 2 configurations for signaling dangerous failures as per
EN13849-1:2006/DAM1 (in preparation).
Ì External K time monitoring: normally ON.
If there is a fault in the internal feedback or the external device monitoring (EDM) --> OFF.
This signal makes it possible to stop hazardous movements, or at least to indicate the fault to the operator.
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