APPS: Control valve drive's signalling status

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==> Automation List post by Mik...
To view or reply to this thread: http://www.control.com/thread/1230150278


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APPS:  Control valve drive's signalling status
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Hello,

I'm reading a specification about control valve drives (http://www.auma.com). I have found something very interesting to me. In addition to limit switches that can signal open or closed status to the PLC, it also have possibility to signal torque open and torque closed switch.

I'm not sure how this is determined. For example if valve is opening and hit an obstacle on the way before it opens totally, it needs to signal torque open signal.

I wonder how this works? How drive's electronics can determine this state?

Thanks for the help.
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