Recent content by bobc02

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    Looking for a 12-24 VDC PLC to Control Two 48 VDC Motors

    I'm looking for a PLC, suitable for a hundreds of deployments in a office setting. I'm hoping people will review my minimum requirements, and offer suggestions. 1) Control two 48 VDC Motors that are reversible - reverse through a separate 12 VDC Contactor Relay connected to PLC outputs. 2)...
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    Ladder Diagram for Motors Control - Need Help With Limit Switches

    Thanks @MWO, that timing technique seems like good advice. I will look into it. Right now, the PLC (Finder OPTA) is failing me, so I'm looking for a replacement. Will be posting, asking for suggestions.
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    Ladder Diagram for Motors Control - Need Help With Limit Switches

    While testing the hardware, I found that the motors keep running when the momentary switches are released. I need them to quit working when released. So I changed the "seal in" coils to Positive, which seems to work - see attached. What do you think? NOTE: The Momentary switch is a keyed switch...
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    Ladder Diagram for Motors Control - Need Help With Limit Switches

    Thanks very much, MWO! I've attached my changes based on your suggestions, and it's working fine. I now understand how "seal in" works. Bob
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    Ladder Diagram for Motors Control - Need Help With Limit Switches

    I'm developing my first PLC Ladder Diagram to control two motors(left & right) that turn screw jacks that move from a stowed position, to a deployed position - see attached. The DC motors are reversible, to rotate the screws from stowed to deployed, and back. There are four limit switches (stow...
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