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profibus vs hardwired limit switches

profibus vs hardwired limit switches

profibus vs hardwired limit switches

(OP)
We are supplying an auma actuator and the client has said they want to use profibus. They have came back and said that for open and closed position a limit switch is required. Am I not right in saying that with profibus hardwired limit switches are not applicable? or would you still want to hardwire?

Thanks

RE: profibus vs hardwired limit switches

Ask the client what they are using the switch for. Maybe it isn't going to DCS - perhaps the switches drive local indicators or provide an interlock to a process drive, or something similar?

RE: profibus vs hardwired limit switches

Am I not right in saying that with profibus hardwired limit switches are not applicable?

yes, I would say you are ot correct. Profibus is simply a communications 'language' to tell something to do something. It has nothing to do with absolute open or closed position. for that you need some kind of absolute feedback; either an absolute encoder of some kind or limit sw;s as your customer is telling you.

RE: profibus vs hardwired limit switches

darn no edit button. shud have read:

yes, I would say you are NOT correct.

RE: profibus vs hardwired limit switches

Are you all trying to fit as many double negatives in your posts as possible!

RE: profibus vs hardwired limit switches

It is my experience that electrical actuators, when configured with a field bus interface (Profibus, AS-Bus etc) generally do not provide hardwired limit switches. The open/close and position status is sent over the field bus. Perhaps they are requesting the fully open/close position status be sent over the Profibus?

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