There are specific timer modules in a PLC rack that are used for on-delay and off-delay functions. In addition to the timing function they provide one or more sets of contacts. PLC's were invented a decade before the first microprocessor. Some of what they do is more than a little bit arcane.Don't think it would be a Timer Input module as timing is done in the CPU, maybe a Temperature/Thermocouple Input module.
This is what they used to look like, Sam. Still around, but in much more compact DIN cases...I still remember loading PLC programming from a cassette tape deck but don't think I ever saw a timing module. They do make modules for just about anything you can think of or want though. If the print was better maybe we could look up the module model numbers...
Here, Sam: https://www.ebay.com/itm/ABB-Brown-...893599?hash=item48ecf1799f:g:wx8AAOSwvEFfWSv5Sure, I used lots of octal base relays and timers all the time before or in addition to PLCs. I was a big fan of A-B SLCs when they came out as really good, inexpensive, small PLCs that didn't cost more than a few octal base modules and did a whole lot more. But I can't remember a PLC timer module. Time to google and see what's out there... Hmmm... Didn't find one except for newer DIN rail stand-alone timer modules (instead of octal base) and references to the various internal PLC timer programming blocks.
EDIT: I think we are talking about 2 different things. What I am referring to is a module that sits in the PLC base itself. Which is also DIN-rail mounted but has slots for their basic modules to be plugged into the PLC base. When you filled up the base, some PLCs supported a second base w/its own power supply module but driven by the Logic of the first base/rack.
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