Limit switch to limit servo power on

    I'm wanting to wire in a limit switch into a DX200. I want to use said input to limit the servo power on unless its true. I also want to signal an alarm or message showing that this limit switch isnt operation engaged. Any input on how you would do it?

    Easily done in the ladder program. Use the Universal Input to drive the Specific Input (4xxxx) for whichever category Servo Off you want. Always though, think about a “get out of jail free card.” How to recover upon a switch failure.

    Since this is going through the ladder it is NOT safety rated. If you want safety rated the GSIN inputs would be used and a machine safety logic circuit written.

    An alarm might be easy or may require some digging in the ladder. Depending on the ladder you might be able to tie into an Auxiliary Relay (7xxxx) that is already mapped in the ladder or you get to write your own mapping. It possibly gets deep depending on what is currently in the ladder, but definitely doable.

    I know a thing or two, because I’ve seen a thing or two. Don't even ask about a third thing. I won't know it.

    I would only want to limit ext servo on. I want to be able to still turn servos on in teach. Basically I'm just putting a ladder stand on the fencing of the robot and I don't want the ladder left inside the work area of the manipulator or positioner. Requiring the ladder be removed from the cell didn't work. I'm trying this approach. So I need to use SIN#030 EXT SERVO ON?

    40045 is external servo on. Are you starting the robot from a plc, hmi, or push button? This requires the controller to be in Remote Mode to work. They could still start the system in Teach or Play Mode from the pendant unless you have PP SERVO ON PROHIBITED. You could also PROHIBIT PP START.

    Me, personally, I would probably go the servo off route. Servos are off in Play unless the limit switch is in the correct position.

    I know a thing or two, because I’ve seen a thing or two. Don't even ask about a third thing. I won't know it.

Advertising from our partners