I have an application with a device that generates an alarm output which I plan to wire to a relay and use the NC contact on that relay to provide a remote alarm signal to a DCS. My concern is if the relay coil fails the NC contact will not open and the alarm condition will not be detected by the DCS.
Is there a means to detect if the coil fails? I am not overly concerned since this is an remote alarming function only but I wonder how this can be accomplished is the function were to interlock with equipment.
I've looked at safety relays but I do not see where this is an application for those.
The device generating the alarm is not configurable to switch "low", i.e. to maintain the alarm output then de-energize under alarm conditions.
Is there a means to detect if the coil fails? I am not overly concerned since this is an remote alarming function only but I wonder how this can be accomplished is the function were to interlock with equipment.
I've looked at safety relays but I do not see where this is an application for those.
The device generating the alarm is not configurable to switch "low", i.e. to maintain the alarm output then de-energize under alarm conditions.