Thread View: comp.protocols.misc
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Started by Rajiv Arora
Wed, 02 Sep 1992 17:17
What are "Allen-Bradley PLC protocols" ??
Author: Rajiv Arora
Date: Wed, 02 Sep 1992 17:17
Date: Wed, 02 Sep 1992 17:17
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The subject line says it all. A potential employer has indicated that they work with Allen-Bradley PLC protocols. Now I'm a networking person myself, but obviously I let somethings slip through the cracks! I have no idea what PLC refers to, and what type of protocols these are, i.e. MAC, network, transport, etc. Perhaps someone from Allen-Bradley reads this group?! 8-) I haven't found any mention of these protocols in the usual text books (Halsall, Stallings, Tanenbaum). Can anyone refer me to a book that talks about this stuff? -- ****************************************************************************** * Rajiv Arora Email: rajiv@bongo.cc.utexas.edu * * Phone: (512) 795-9015 * ******************************************************************************
Re: What are "Allen-Bradley PLC protocols" ??
Author: jsanchez
Date: Fri, 04 Sep 1992 14:38
Date: Fri, 04 Sep 1992 14:38
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PLC stands for Programmable Logic Controller which is a manufacturing term for computer controlled machine. This is sorta like a robot but not exactly the same. Anyway, from what I know PLCs talk to computers over dedicated async serial lines and download code with a simple send block/ack type of protocol. At least that is how they worked a few years ago. -- Jim Sanchez Hughes LAN Systems - Bellevue, WA (206)828-7417 Internet: jim@hls.com OR jsanchez@polari.online.com UUCP: ..!uunet!polari!jsanchez
Re: What are "Allen-Bradley PLC protocols" ??
Author: Randall Atkinson
Date: Sun, 06 Sep 1992 15:01
Date: Sun, 06 Sep 1992 15:01
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PLC does stand for "Programmable Logic Controller". A PLC is not a robot or a mechanical device. Rather a PLC is a small real-time computer/controller with I/O ports. They are usually programmable in a language called "ladder logic" (which is rather like older electrical relay diagrams, not coincidentally) and are often programmable in other languages as well. Robots or other mechanical devices can be controlled by PLCs if the I/O port is wired to the mechanical device properly. The protocol used to communicate between a general-purpose computer and a PLC varies by vendor, though MAP is becoming commonplace.
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