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2.38.3 Decision of DS open/close status
The PROT_COMMON function can determine the behavior and position status of a DS. Signal
configuration and settings for the DS position status are similar to that of the CB. Note that
settings and logics cited below are just available for the DS.
(i) Signal selection
Set either NO, NC, or Both for scheme switch [DS-Contact].
(ii) Contact supervision
When Both is set for scheme switch [DS-Contact], the auxiliary switch contact state of the DS
is supervised. Set On for scheme switch [DS-SV] when contact supervision is required. The
supervision period has to be set between 0 to 100 seconds for the setting [TDSSV].
(iii) Logic
Figure 2.38-2 shows the logic used to determine DS status and generates the output signal of
the DS state: DS_CLOSE or DS_OPEN. The supervision scheme logic to supervise the status
of the DS auxiliary switch contacts. This scheme logic is applied when BOTH is set for the
scheme switch [DS-Contact]. For the operation, the user should inject signals of DS states for
the following PLC connection points: ‘DS-NO CONT’, ‘DS NC CONT’ and others.
Figure 2.38-2 Scheme logic to determine DS status
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