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Sensor input or manual emulation input


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Hi!

I have an external 4-20ma loop water pressure sensor to tell me the level of the water. This external input would be referred to during normal operation.

For the initial "on-site" set-up of parameters and maintenance thereafter, I need to have the source of the water level data NOT come from my external sensor thru the linearization FB , but from my "% of water" button in the HMI ... to set the emulated water level at will.

How would I code a "switch" of the input sources?

 

Thanks!

 

 

 

 

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