Allen Bradley Micro timer problem
Allen Bradley Micro timer problem
(OP)
I am using an Allen-Bradley Analog Micro controller for self-cleaning filters. It has an ingenious program that steps to a higher diferential pressure if the cleaning is unsuccessful and steps back when the cleaning is successful. This part works very well. The problem I am having is with a 24hr timer which is built with T4 timers and counters. Instead of self-cleaning every 24hrs it self-cleans every 48 hours. I would be glad to send someone a ladder diagram if they think they can decipher the problem.
Swinney
Swinney





RE: Allen Bradley Micro timer problem
pankau42@yahoo.com
RE: Allen Bradley Micro timer problem
lsrcrr@bellsouth.net
RE: Allen Bradley Micro timer problem
send to automation_mann at yahoo.
I created a similar program that refers to the status files in the processor. The S2:40 file contains the hour and the S2:41 file contains the minute. Using a GEQ compare instruction, I latch a bit for the start time. I then used an EQU instruction to unlatch that bit to cease the cleaning mode. I can provide an example... Works great, the only problem... the processor time does run behind real time, so I usually loose 5 minutes a month... I have an update function coded in my HMI program to fix that.
RE: Allen Bradley Micro timer problem