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Thursday, 7 May 2015

Troubleshooting Allen Bradley PLC with RSLogix Emulate 500

Troubleshooting Allen Bradley PLC with RSLogix Emulate 500

Here are a few of the most common problems people have with RSLogix Emulate, and how to get around them.

Q. When I run a project in RSLogix Emulate, my system seems to slow down drastically.  What's wrong?
Answer: The software runs your ladder logic projects as fast as it can.  Sometimes, that means that the software will "take over" your computer's CPU.  You can stop this from happening changing the Priority setting in the Emulation Settings dialog.

Q. Timers are not updating.
Answer: You may need to increase the priority of the running program.  Change the Priority setting in the Emulation Settings dialog.

Q. The screen does not refresh fast enough.
Answer: You may need to increase the priority of the running program.  Change the Priority setting in the Emulation Settings dialog.

Q. Why do I keep getting a "watchdog timer" fault?  There isn't that much ladder logic in my project.
Answer: Because the software isn't the only program being run on your computer, the emulator runs projects slower than a programmable controller will run them.  You can adjust the watchdog timer setting in the Fault Options dialog.

Q. RSLogix Emulate doesn't seem to perform exactly like my PLC-5 or SLC 500 processor. 
Answer: The software does not perform all of the functions of a PLC-5 or SLC 500 processor.  Check the Emulator exceptions list.  If you are seeing behavior that can't be explained from that list, please contact Rockwell Software Technical Support.

Q. What's wrong with all my I/O instructions?
Answer: The software doesn't know about I/O.  Most instructions having to do with I/O operations are not executed.  Check the Emulator exceptions list.  For a more detailed description about how the software works, see the What RSLogix Emulate does topic.

Q. Why can't I see emulated projects in RSLinx or WINtelligent LINX?
Answer: Make sure you have configured a communications driver for the RSLogix Emulate product you are using.  See the Communications setup topic for more information.

Source : Rockwell Software Inc.
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