×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

PLC5-80E/E Force LED Steady Amber

PLC5-80E/E Force LED Steady Amber

PLC5-80E/E Force LED Steady Amber

(OP)
I have a PLC-5/80E/E that has a steady force LED illuminated. There are NO comms either from the DH+ or the RS232 ports. The Processor LED is steady red. I've tried leaving the power off with the battery disconnected overnight. However, the problem still exists.

I took the CPU board out and installed it in a PLC5-80B/E just to see what would happen. The CPU appeared to boot but the Processor LED blinked red/green indicating it was trying to flash and there were still no comms. I let it go for about 10 minutes with no change.

Has anyone run across this problem? It looks like someone shut down the CPU with the forces enabled but should that alone disable the DH+ and RS232 comms?

Any help appreciated.


CTG

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources