My input card needs a -24vdc input. I need to add a bypass selector switch. I took -24vdc to switch then out to plc input. I got no signal. To jerry rig it, I came off of my selector switch with -24vdc to the common terminal of a relay and under the same terminal to the plc input. I then took +24vdc to coil of relay. This works but looks like **** and I dont need the relay. A little enlightenment would be greatly appreciated. Thank You.
slc 500 source input
- Thread starter joeb1
- Start date
bernie_carlton
Lifetime Supporting Member + Moderator
Please state the exact part number of the input card. Make sure you have the wiring diagram for that particular card.
In general a sourcing input card will have the plus side of your 24VDC power supply attached to a common point. The low side of the 24VDC power supply is sent to your switch then back to the input.
In general a sourcing input card will have the plus side of your 24VDC power supply attached to a common point. The low side of the 24VDC power supply is sent to your switch then back to the input.
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