Can multiple Logix PLC's control the same Ethernet I/O?

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A client recently asked me if multiple CompactLogix (or ControlLogix) processors could control the same Ethernet I/O. Since RSLogix5000 has supported Ethernet I/O, its been possible to setup two processors to control, or "own," the same remote rack of Ethernet I/O....
Rockwell Allen-Bradley's Logix-WP006 Table 1 - Adding I/O Online

ControlLogix support for adding I/O online

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A common client question of late is what are the abilities of the ControlLogix when is comes to adding I/O online. In certain industries, processes can't shut down as doing so would lead to loss of production or in extreme...
RSLinx USB Driver - RSWho finds L24

Plug and Play with Allen-Bradley Devices

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Plug and Play comes to the world of Allen-Bradley Industrial Automation. With a fairly recent copy of the free RSLinx Classic Lite, and A-B devices with USB ports, you simply plug the A-B USB product into your PC using a standard USB...
USB Cable Data Highway Plus - 1784-U2DHP

USB Cables For Use With Allen-Bradley (A-B) Products

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For decades we’ve relied on our laptop’s trusty Serial Port or PCMCIA Slot to communicate with legacy A-B devices. But when our old laptop dies, or a new one arrives, it's very unlikely to have either a Serial Port or PCMCIA...
Free Software Downloads From Rockwell Software Download Listing

Free Allen-Bradley (A-B) And Rockwell Automation (RA) Software (Part 2)

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UPDATE 10/31/2017: Try as I might, I can no longer find the software packages listed in this article anywhere online (the associated sites have been completely redesigned.) Where to get free software for Allen-Bradley (A-B) and Rockwell Automation (RA) products,...
Rockwell Automation Literature Library Homepage

How to get Allen-Bradley (A-B) and Rockwell Software (RS) Manuals and Documentation: Part 2

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Getting hard physical copies of manuals and documentation for Allen-Bradley and Rockwell Software products:   Click here to read part one of this article Yesterday we discussed how to get electronic copies of Allen-Bradley (A-B) and Rockwell Software (RS) manuals and documentation....
Rockwell Automation Literature Library Homepage

How to get Allen-Bradley (A-B) and Rockwell Software (RS) Manuals and Documentation: Part 1

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When using new products from Allen-Bradley or Rockwell Software, you’ll likely need to refer to the product documentation and manuals for product details. And if you still have the box the product came in, you’ll often find an installation...
RSL5K Controller Properties with Nonvolatile Memory Tab Circled

How to test the loading of Non-Volatile memory in your CompactLogix or ControlLogix

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Similar to other Allen-Bradley PLC's, the CompactLogix and ControlLogix Controllers give you three options for loading the Controller's memory "image" from non-volatile memory (CompactFlash, SD, etc.) These "load modes" are "User Initiated," "On Power Up," and "On Corrupt Memory." Below I'll walk...
Logix DateTime Off By Hours

Why your CompactLogix or ControlLogix Real Time Clock (DateTime) may be a few hours...

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A client recently called frustrated that the real time clock in his CompactLogix processor was always off by 4 hours. While I had heard this complaint in the past, since I hadn't run into it myself I needed to do a little research to understand what this client...