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touch bit with non builtin HMI's

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Hello Members,

I'm working with PLC  USC- B5-T42 and HMI USL-050-B05. I have created an enegry saving mode that switches certain things off when the machine has been idle for over 30 minutes. 

In order to wake the machine back up again I though i would use the "touch bit" .  The touch bit however doesnt work, I can press all over the HMI and the bit doesnt change state. 

Is it the case that the touch bit only works for the built in HMI and not via VNC?

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