hey yo all!! i was kept on trying to get the pwm from the PLC, by configuring the i/o and write directly to the memory registers., i skipped teh ladder,
TODAY I LOAD THE PLC's I/O configuration and look at it , i found out that in the past, i did not update teh i/o from teh PC to the PLC!! how stuPid of me.
after doing that, yes, i got the beautiful square wave pwm out, (finally) with duty of 4ms out of T=10ms, i use the value as calculated , thanks
next, my professor told me to cascade the 3plc and obtain 3phase shifted 120DEGREE pwm signal , .
phew,,, at least now, i got something good to submit in my report due next week..
i reli appreciate the advices given, steve, jesper, rast, every1 in this thread ,
Thanks, i learn my lesson now.
never ever giv up