Contact US

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!

*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

Allen Bradley PLC

Allen Bradley PLC

Allen Bradley PLC

HELLO fellows

What could I do if a PLC losses a program during operation ? sometimes the PLC does not allow me to download the program. I have checked the path,network, and status LEDs, it is fine.

RE: Allen Bradley PLC

A-B has made a lot of different PLCs over the years with a lot of different options and processor packages. It would be helpful to know which one. As a general speculation though, if it can "lose" the program at all, you must be speaking of one with RAM memory, which requires a battery to keep it alive when power is off. So the first thing that comes to mind is that your on-board RAM battery is dead, they last about 5 years. The second issue would be that for some reason, you are getting power interruptions from your power supply, either because your line supply is erratic or you have a loose connection or some other issue with your power supply. You need to have both problems in order to lose a program and you must fix both of them. Replacing the battery alone will keep your PLC from losing the program, but the loss of power, even momentarily, can be causing other havoc.

"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington

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! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close