PLC Programming - Need Help With My Program!

[elpohl]

Hello there! I made a program that has a Timer (TON) at the beginning of the process that activates under 2 conditions. Everything works perfectly, the only problem is that once the cycle is complete, I can't start it all over again! We need to reboot the PLC in order to accomplish that. I suppose there's an easier way hehe, so I need some assistance with that.

BTW, I have the program, but how could I post it here?

- We use Rockwell Software for a 1500 Analog Micrologix.

Thanks very much!

 

[jraef]

You probably forgot to program a Reset input to that timer. Read your instructions for setting up a timer. You need to place in an input or event or reference bit of some sort that will reset the timer when you are done.

Interesting that the MicroLogix will apparently allow you to do that. RSLogix would not allow you to run the program if you forgot to program an element of a timer like that.

 

[controlsdude]

I agree
at end of cycle, this bit or numeric value will oneshot a reset(res) to the timer.

 

[elpohl]

You know, now that I remember, we did apply a (RES) at the end, but somehow theres something wrong...

Our system uses a conveyor belt and an optical sensor that "reads" faulty pieces. Once detected, the conveyor is stopped with a relay, and 4 cylinders pick up the piece and toss it outside. Once the cycle is done, the conveyor does start again, but the sensor won't read the piece again. Its kinda weird... it would be much easier if someone would take a look at the program, but again, how can I share it? :S

 

[jde777]

What kind of sensor is "reading" the faulty piece. It sounds like you are setting the fault but not unlatching or un-sealing the rung that triggers the fault.

 

[elpohl]

Its an optical sensor. Unlatching? Unsealing? Dang, I'm having a hard time with those concepts... my classes are in spanish hehe. But... that sounds like it may be the issue...

 

[ADMIRALKEN]

Post your question in the forums at

http://www.mrplc.com,

that board allows you to post your program. Then someone can take a look and tell you exactly what's wrong with it.