AB RSlogix5000

[ajay34]

hello all..

i have a Question regarding AB PLC..i m new as expose to AB plc

1) how could i do online edit on logic?
i used to with GX *mitshubshi) or CX *omron which when we do online edit we no need to stop plc and just can download after edit
..
but with Ab what i do normally just stop the plc and go online
and download..i like to know if there way to do it with out stop plc

[Ken Roach]

Allen-Bradley controllers in general support online editing, but not partial program downloads.

This functionality differs substantially between product families; Are you using a PLC-5, SLC-500, MicroLogix, or a ControlLogix or CompactLogix controller ?

[jemcneil]

Some things you can edit online and some you can't under RsLogix 5000.

First off, load the program and go online as you normally do, leaving the processor in remote/run mode. You have to have the keyswitch on the processor in remote/run. If you don't know how to do this, you turn the key to RUN then back to REM and leave it there. When you get online your status indicator will show Rem Run - the default location is the upper left corner of the screen.

Now that you are online with the processor in the proper mode, you can add and delete rungs or parts of rungs as you see fit. You can also add tags and alias them to existing physical I/O or other tags. You can edit tags and change the name or description but once created you can't change the alias. Also there are some wierd rules about some tags you can't change at all that I am not going to go into here.

A few things to consider:
When adding or deleting rungs, please be sure that what you are changing is not going to cause unexpected operation of equipment that could get someone hurt. Adding a rung in this mode generally causes the processor to immediately execute the rung. Also, the RSLogix program will generally catch incomplete rungs and prevent you from compiling them but it does not check your logic - after all, the program has no idea what you are trying to do. Also the program will not catch an indirect addressing fault until it tries to step through the rung but by then it's too late and will fault the processor. (At least that's what it did on PLC 5 and SLC 500...I'm not so sure about RSLogix 5000 as I avoid indirect addressing anymore.)

Whew! Sorry about being long-winded but that's the basic concept. I'm sure others on here will have some to add to what I said or correct me on things I got wrong.

[ajay34]

ken >> using controllogix..

jemcneil...i could go online ..wht i m asking was there any shortcut to do edit online on ladder without stop PLC..same as GX(mithsubshi) or CX omron..

[sthompson]

Originally Posted by ajay34

ken >> using controllogix..

jemcneil...i could go online ..wht i m asking was there any shortcut to do edit online on ladder without stop PLC..same as GX(mithsubshi) or CX omron..

It is not necessary to stop the ControlLogix PLC to do Online Edits. Double Click on the left bar beside the Rung you want to Edit. Or you can navigate to the Rung you want to Edit, and hit the Enter Key. If you like using Keyboard Shortcuts, search for Keyboard in the RSLogix5000 Online Help.


Stu....

[ajay34]

when click right on mouse ..i could see list of like edit descreption ,monitor online ..

after dping edit and when i download to PLc from pc it stop the all the output ..that why i m asking is there why to download without stop plc after we edit any ladder logix

[sthompson]

Then you aren't Editing Online, you are Editing Offline, and then Downloading it. That is a big difference! The definition of Online Editing is making your changes while Online with the PLC and the PLC is in Run Mode. To date I haven't come across a PLC that you can Download the Program to while it is in Run Mode. I know for sure you can't with Omron, I haven't worked with the Mitsubishi, so I couldn't say, but I doubt it.

Stu....

[ajay34]

yes that what i been doing know..but for omron and mitsubhsi..it can be done doing online edit while the PLC in run mode..we no need to change the plc to stop..it can be done while online edit on ladder..

like i told i newly expose to AB plc

[sthompson]

The same applies to AB PLCs that support Online Programming, which the ControlLogix/RSLogix5000 does. Just go Online with the PLC, and follow the steps I mentioned previously. It is similar to the Omron, put the rung into Edit, make your changes, comfirm the Edits. The AB PLCs normally have one extra step, you can Test your Edits before committing to them. Then when you are happy you can Assemble the Edits, if you are unhappy with the results, you can Untest the Edits. The RSLogix5000 have a function to Confirm-Test-Assemble all in one step. It is the Right Arrow on the right side of the Edit Toolbar.

I think you need to do some reading, you can start here.

http://literature.rockwellautomation..._category.hcst


Stu....

[ajay34]

wow ..thanks ...i didnt see it..now i could do it .without stop the plc ..thanks and thank you for the study page ..

[sthompson]

Originally Posted by ajay34

wow ..thanks ...i didnt see it..now i could do it .without stop the plc ..thanks and thank you for the study page ..

Your Welcome. If you have specific questions as you get deeper into it, by all means, come back and post your question. Someone should be able to help you.

Stu....

[ajay34]

sorry for my poor english and question sthompson...
i m glad that ppl here willing to help and teach me out of the box..
are fimiliar with wincc seimens plc as well