[raybbr]

When you "programmers" can read seven different ladder logic programs with up to 24,000 rungs, troubleshoot them write them and understand every machine they are being used on - give me a call....

;^)

[dayglored]

Ah, ladder logic! Yes, indeed... in the mid 1980's I designed industrial process control systems that were intended (in some applications) to replace ladder logic controllers. So we often found ourselves in a position of supporting a customer who had a controller, wanted to replace it with our more general-purpose machine, and needed help converting the ladder logic into the process-control BASIC that was the native language of our box.

It was.... ahem.... [cough]... a "learning experience".

I must ask, what in heaven's name type of application requires 24,000 rungs???

[Don W]

That’s the system in use at the laundry I worked at, for the folders, spreaders and stackers. We converted a bunch of proprietary (read XPnsive) controllers to Allen-Bradley central control.

Quite easy to follow, once you understand how it works. Installing the sensors was the longest part of the job, debugging was done in a couple of minutes per machine type once the full program was written.