Problem of pulse output inside of interruption program

[elenercom 1]

Hi everybody, Please help me to solve this problem. I use FX3U-32MT and try to generate pulses ( with one of instructions PLSY, PLSV or DRVI,..) to rotate a servo motor. everything is OK when a program is without interruption. Problem is when the above mentioned instructions are inside of interrupt program, they can be executed only once after PLC is switched to RUN (I used high speed counter set interruption). Program check is OK. PLC has no error. Although output Y0 , instruction activation flag and output busy flag are OFF, the instruction can not be executed again. Your help is highly appreciated. Thank you for reading.

[JRoss 84]

I've never put motion control instructions inside an interrupt routine. How are you triggering the interrupt? You may need to do some sort of housecleaning work after each time you use the interrupt routine, to reset flags etc. Because the interrupt routine doesn't run all the time, it may leave things undone.

[elenercom 1]

Thank you for your reply. I use the high speed counter set instruction where the destination device is an interrupt pointer. Each time, after pulse output has stopped, I tried to reset flags concerned to output Y0. It still does not help. Actually I can do the same thing with servo set in speed mode to avoid that problem. Anyway I think it should be also OK in positioning mode.

[Sergei Troizky 26]

What do you call "instruction activation flag"? See 8.2.1 Cautions on subroutines and interrupt routine- Countermeasures against latches of devices used in subroutines (or interrupt routines) in the Programming Manual. It does not mention your instructions directly, but I am almost sure this is your problem. Edited 22 Oct 2011 by Sergei Troizky

[elenercom 1]

M8348 is called positioning instruction activation flag of Y0 output. I was familiar with cautions in 8.2.1. I can handle output or timer inside interrupt program without any problem. Such a pity that there is no example on high speed output inside an interrupt routine. Thank you for your comment

[Sergei Troizky 26]

I did not mean you having problems with timer. I mean that your problem is of the same nature.When all the pulses are done, you must execute the instruction as false in the main program, otherwise it remains active forever.