Internet PLC Forum
General => Technical support => Topic started by: Ken on January 13, 2003, 07:11:23 AM
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Hello everyone,
Has anbody ever had to assemble a current or voltage sensing relay. My situation in which I require it is as such. I have a master slave configuration wired together using a four conductor cable. Two of the wires are for RS 485 communication and the other two are power from the vicinity of the slave feeding the master. The current is currently switched on the hot side of the master PLC. In other words +12VDC from the area of the slave enter the comm/power cable and connect to a SPST switch then to the PLC and the ground or 0VDC is fed back to the vicinity of the slave via 1 of the remaining 3 conductors in the cable. What I need to do is sense this current and drive a relay that powers the slave. I hope this makes sense, if anyone can help me out it would be greatly appreciated.
Thanks,
Ken Talley