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PLC Health Monitoring & Reporting Sys 3-11 Manual EPM40002083-001 Rev -
3.4 Flash Head Status Reporting Relay Installation Wiring
The PLCHMR features eight (8) configurable status reporting outputs. Each output
connects to a form-c relay via three screw terminal connections. Each screw terminal
connection is uniquely tied to one of the relay’s contacts. In accordance with Figure
3.4-1:
1) Terminal labeled #1 connects to the normally-open contact
2) Terminal labeled #2 connects to the common contact
3) Terminal labeled #3 connects to the normally-closed contact,
Typically each discrete alarm reporting connections is made to the site’s alarm
monitoring system uses terminals 1 & 2. Using the typical connection ensures that a
fail/fault indication is reported in the event that power is interrupted to the SG-60 High
Intensity Strobe Light System.
Each relay’s state is controlled uniquely by its software Tier Reporting Mechanism
(TRM). The TRM is software configurable and enables the operator via a menu to
combine tier related flash-heads into a group that can be associated with a TRM. (See
Section 3.7.3 for additional details on software configuration)
The two operating states (activated/deactivated) of each relay represent the state of its
corresponding TRM. The TRM’s two states are Flash/OK and Fail/Fault. The TRM
state FLASH/OK represents a normal operation alarm level and is indicated by an
activated relay. The TRM state Fail/Fault represents an abnormal operation alarm level
and is indicated by a deactivated relay.
For example:
Assume that all the flash-heads on tier #1 are operating normally when some event
causes a tier’s flash-head to malfunction. While all of the flash-heads on tier 1 are ok,
TRM #1 is set to FLASH/OK and relay #1 is activated. After the fault event occurs
causing a flash-head on the tier to malfunction, then TRM #1 would automatically
change to the Fail/Fault state which would de-activate relay #1.
An activated relay cause the normally-open contact to be closed allowing any signal
applied to the common contact(#2) to appear on the normally-open contact (#1). For a
deactivated relay the normally-close contact is closed allowing any signal applied to the
common contact (#2) to appear normally-closed contact (#3).