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

Omron CPM1 PLC ladder-logic "set/rset" vs "out/not out"

Omron CPM1 PLC ladder-logic "set/rset" vs "out/not out"

Omron CPM1 PLC ladder-logic "set/rset" vs "out/not out"

Lately my company has been using Omron PLCs which are programmed using ladder logic. We had this frustrating experience where we were using "out/not out" commands (one per relay, per block). The frustrating thing is, to put all these darn conditions in each individual network to control each individual relay. Our whole program uses these commands exclusively and it's a mess! Very tough to figure out how it works.

I went to program a new subroutine for machine diagnostics, just to cycle each movement and time the motion and report the results. So anyway, I looked through the manual and found out about "set/rset" which lets you turn on and turn off a relay based on computed input conditions, ie, end of stroke. I used these commands very successfully and the diagnostic program was completed and debugged (on site!) in only a day. We could have done the whole program this way but never knew about these commands.
Another command Omron has is "keep", anyone have experience? I haven't used it yet.


RE: Omron CPM1 PLC ladder-logic "set/rset" vs "out/not out"

Keep is exactly the same, and it works the same way as SET and RESET, the only difference is that you have both commands in one, this mean that two inputs, one to activate and the other to desactivate, if you activate both inputs, the reset input is priority.

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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