AB Micrologic RSS file

I have been trying to write a program for a AB Micrologic 1500 to start up a chipper / blower system, and am getting to the point of frustration. I have had no formal training, but I understand PLC and thier functions. It seemed fairly simple until I started trying to make it "better". I have attached a zip file with 2 programs. One is very simple, and the other (mine) that I am having problems with. Any help would be appreiciated.

Snow,
you have to point people to what the problem is
Dont expect them to sit and make guesses. Life is too short allready.

I don't know the problem. I have no way to test it other than looking at the ladder. In my mind it should work, but there are errors in the ladder that I can't figure out. Maybe I am over looking something simple. I just don't know.

OK, I guess you mean that the program won't verify.
Check the help text in window below the ladder view:
[attachment]

Use the Bit Level!!

You need to specify logic the bit level, or in other words....
In ladder line 20 as an example....

Your logic uses a N/C T4:11, but does not specify WHAT you are monitoring....

Are you looking for T4:11/DN or T4:11/TT, or T4:11/EN bits?

Instruction bits: 13 = DN (done)
14 = TT (timer timing bit)
15 = EN (enable bit)

Once you specify these bits the program will verify properly. As for your logic, I have not spent any time looking at your possible faults.

I try to develop using State Logic, which is a more concise way of programming.

Let me know if you require any additional assistance.

To write an address for a timer use this example:

T4:0/dn

To delete unused lines (rungs) highlight on the left, press the delete key on your computer.

Attached is a copy of your file with the verify errors cleared.
I did not check the logic for correctness, use for information purposes.

Version???

What version of RSLogix500 was your file written in?

I am stuck with version 4.5 (I can upgrade at my own expense) & when I try to open your file it crashes RSLogix500 with a file format error.

Version?

Greg,

I used Ver 5.2 to make the edited file I posted.

Sid

Snow Dog said:

I have had no formal training, but I understand PLC and thier functions.

Click to expand...

That's a start. However, since you're working with A-B products, you need to understand A-B's nomenclature - specifically in this case, the function of delimiters.

The timer you're trying to use lives in an area of memory called a file. This file has been defined to hold timer structures. It is the fifth file in the processor's memory area, hence the term "T4", numbering from zero. If you wanted a new group of timers set aside to handle some function of your machine you could create a new file called T15 which would also hold only timers.

Now, within this T4 file are individual timers, with preset words, accumulated value words, and control bit words. To examine the contents of the elapsed time for the first timer in this file the address is T4:0/ACC. The ':' delimiter separates the file address and the specific timer address. The '/' delimiter separates the timer and the particular part of the timer you're interested in. To check if a timer is timed out, that is, is the done bit turned on(?), the address is entered as: T4:0/DN. As in,

   T4:0/DN

-----] [----

Counters are addressed pretty much the same way.

Hope this helps.