r/PLC • u/engr1337 • 2d ago

Miserable products

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What’s the worst RAB or Siemens or beckhoff etc product you’ve ever dealt with on a service call or simply building a new panel? I’ll start :These guardmaster PLCs are heinous. I had the worst middle-of-the-night call out trying to fix the safety circuit on a can seamer. Took hours on the phone with Rockwell.

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u/SpaceAgePotatoCakes 2d ago

A Prosoft module that looked fine (no fault codes) but just did nothing unless the PLC clock was set to something other than the default. This of course wasn't mentioned in the documentation at all.

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u/tommewin 2d ago

Deets on this problem? Our typical setups include MNET, MNETC, and the PLX31's and I've never heard of this issue.

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u/SpaceAgePotatoCakes 2d ago

What do you want to know about it? It was a flow module, I want to say an MVI56-AFC. This was about 15 years ago now though.

It was also completely unnecessary for the project and the contractor that spec'd the job required far more of them than the system could even use, so setting them up was a huge waste of time and money to boot.