Multilin 750 Logic
Multilin 750 Logic
(OP)
We have seperate Transformer Mechanical Alarms being hard wired to Logic Inputs in SR 750 relay (Logic Input 3 through Logic Input 7). See attachment.
We want to develop an "OR" logic within SR 750, so that in the event of any of these Mechanical Alarms going high, a common target relay needs to go high. We then want to read the status of this common relay as "Transformer Common Trouble" in Modbus ( RS485 link has alrady been established between DCS & the relays ).
Is it possible to do this? If yes, how....
We want to develop an "OR" logic within SR 750, so that in the event of any of these Mechanical Alarms going high, a common target relay needs to go high. We then want to read the status of this common relay as "Transformer Common Trouble" in Modbus ( RS485 link has alrady been established between DCS & the relays ).
Is it possible to do this? If yes, how....





RE: Multilin 750 Logic
You'll probably have to take care of the name of the alarm on the other end of the Modbus cable. I suspect you may be able to re-map the Modbus register to a user register as well.
The 750 is getting a bit long in the tooth and has fairly limited configuration/programming options compared with present generation protective relays.