Online editing function in RSLogix software allows PLC programmers to monitor and correct the logic live. You can see all the instantaneous values which makes it a good debugging tool as well. You can make logic modifications such as insert, edit and delete logical instructions. Zone markers (denoted by red colour in the rung number) are affixed as you enter editing, insert and test mode.
General rule of thumb is that lower case zone markers indicates that modifications are only in the computer memory. And uppercase zone markers denotes that the modifications are in the processor memory. Once the logic modifications are successfully tested, compiled and assembled, the zone markers disappears.
This is what a zone marks looks like, and I will flag each of the zone marker as we progress through this demo below.
Lets Get Started
Go online with the controller.
Once online with the PLC, the textbox will turn green.
Open you ladder logic and scroll down to the rung that you want to edit.
Double-click on the rung number. For our example, it is rung #25. The rung will turn red with “e” as a notation. Below the “e” rung, RSLogix has duplicated the rung with “r” notation.
Make the necessary modification to your logic, and once you are done, click on rung #25 (the rung that you modified) which should turn the column red. For our example here, we are deleting the GEQ and LEQ instruction.
Click on the “Accept Current Rung Edits” icon/button.
Click on the “Test Edit” icon/button.
Click on the “Yes” button to acknowledge test edit function.
Click on “Assemble Edits” icon/button.
Finally, click on “Yes” button.
Your modification has been written to PLC online.
Now the world is your oyster…. more like the RSLogix500 is your oyster.