Logic Suggestion!

[lchamarthi 2]

Hi ALL, Hope things are going on smoth track. I would like to take suggestion from you guys for the following logic implementation. Please see the attachment for info. I want to turn on/off a Output for a input trigger pulse, as shown in attachment, Off for Toff1 and On for TOn1, again off for Toff2 and on for Ton2...like wise upto Ton4. User has a right to select any of the following. (by entering Non zero and zero for disabling TOff1& TOn1 (User enters 0 VALUE to all rest of the timers TOff2& TOn2, TOff3& TOn3, TOff4& TOn4) TOff1& TOn1, TOff2& TOn2 (User enters 0 VALUE to all rest of the timers TOff3& TOn3, TOff4& TOn4) TOff1& TOn1, TOff2& TOn2, TOff3& TOn3 (User enters 0 VALUE to timers TOff4& TOn4) TOff1& TOn1, TOff2& TOn2, TOff3& TOn3, TOff4& TOn4 Timing range: 1ms to 10msecs Can anybody suggest best way of doing logic? Thanks Lakshmi Application.bmp

[BobB 58]

Reference the set value of each timer to a data memory. The data memory can then be written to by the HMI or SCADA system. TIM 20 D2000 where D2000 holds the set value of the timer. Do not forget that the timers time down and if the set value is altered while the timer is active, the new set point will not be recognised until the timer resets.

[gtsuport 61]

Just a word of caution. You indicate that the timer values with be 1 - 10 millisecond. From past experience, this short a time value is very influenced by scan time. Also. make sure you are using the correct instruction. Standard timer instruction is 100 millisecond time base. Hope this will help. Edited 16 Sep 2006 by gtsuport

[BobB 58]

If I remember correctly, the manual refers to certain timer numbers that are to be used for TIMH (2 decimel place timers). Even then yes the timers will be affected by the scan time. What processor are you using? The faster the better in this case. Would suggest high end CS/CJ for some consistency in the timers.