Martinas Posted July 23, 2013 Report Share Posted July 23, 2013 Hello, Iam new here, recently i started use Unitronics for my projects, so i have question. 1. Can i use PWM FB for not-high speed digital output? I want control heater. Cycle time will be about 10s, duty cycle depends from PID output. I read examples, some forum threads..but i did not found accurate answer . Iam asking for a help. Best regards Quote Link to comment Share on other sites More sharing options...
Emil Posted July 23, 2013 Report Share Posted July 23, 2013 Hi Martinas, In FB PWM cycle time is given in ticks of 2.5 ms. There is no theoretical limit for number of ticks and this way - the sycle time. For example - you can srt cycle time 4000 ticks of 2.5 ms, wich means it will be 10 seconds. You can drive any digital output from FB PWM, including relay. I hope thhis answers your quesiton. Quote Link to comment Share on other sites More sharing options...
Martinas Posted July 23, 2013 Author Report Share Posted July 23, 2013 You wana say 2.5 ms its system scan time? for example if i give 4000 units (cycle time) and 500 units ( duty cycle), then system will understood that i want scan 4000 times and 50% of scans will have value 1 in memory bit? Thanks for your response Quote Link to comment Share on other sites More sharing options...
MVP 2021 Joe Tauser Posted July 26, 2013 MVP 2021 Report Share Posted July 26, 2013 Yes - the output will be on for 50% of the total cycle time (4000 x 0.0025 = 10s) -> 5 seconds. Joe T. Quote Link to comment Share on other sites More sharing options...
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