GL3NN

2 PV800s controlling one PLC

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Hi Guru's so today ive fitted a PV800 7" as a mirror of the original 10" PV800 but i have a problem, if i hit a maintained PB on either HMI the state will change from red (stop) to green (run) on that hmi but it doesnt change the state of the exact same button mirrored on the other HMI  am i missing something silly like a handshake?

 

as always any help will be awesome

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One HMI is commanding the bit to be OFF and the other HMI is commanding the same bit to be ON.

The general convention would be to use two separate bits. One bit for the Push Button (Value) and one for the Indication (Indicator).

Further more, you may want to perform your 'Maintained' condition in the PLC.

MrPLC_Latch.jpg.d6c3ebcda883f1aa502d364a

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Here's another approach in case there are conflicts with both HMIs trying to write to the same tag. All of the tags prefixed with "HMI" are momentary buttons on the HMIs. Both HMIs would read the "Running_Indicator" tag to display the status.

StartStop_2HMIs.PNG.8ec48e7aaa2629ad127a

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Thanks guys ive found another way to do it in CCW by setting the indicator tag the same as the write tag your input is much appreciated 

 

 

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