Hello,
Need some advise on the following: Need to build a timed operation circuit. The operator will determine the time from the panel view by hitting a up or down pb to determin the on time and another pb to determine the off time which will show up in a box above the operators and state how long the the operation will be on and off. What I need to know is how to implement this design into the plc logix.
any help or examples would be very helpful

thank you

How about entering a numeric value on the panel view which is used within either a timer or counter within the PLC ladder logic.

Make sure that your units on the panel view are sensible for the operation you are doing.

i.e. don't try and get an operator to enter minute periods in seconds. Get them to enter the value direct in minutes.

Within the software then you could have a 60 sec self reseting timer which increments the minute counters for the on and off periods.

If the operator can get by with not using UP/DOWN pushbuttons it would be easier to use a numeric entry object.  If you write directly to the timers (via DH+) make sure you don't allow invalid entrys and fault the processor.  IF using RIO then do a LIM before moving the entered value.  If up/down pushbuttons are needed then make the value change faster if the operator holds the pushbutton down.  


DJ. Slick Willy

Make the timer preset a interger value ie N7:xx
the move (MOV) the requied time as set by the PV into this (n7)
after verifing it is within the limit range (LIM)