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Re: More than one PCM (Pneumatic Control Module)?
There are no rules against running more than one PCM, provided only one is connected to the bottom of the PDP. (You can have up to 3 on a single PDP Wago circuit.)
Don't worry about the compressor circuit. If there's nothing connected to the pressure switch input, the compressor power won't be enabled, since the pressure switch is normally closed.
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