Internet PLC Forum
General => Technical support => Topic started by: Aaron Johnson on December 02, 2004, 09:15:19 AM
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Hi,
I am trying to measure the on-time of a pulse using input 3. I used PMON(1) intialization, and PULSEWIDTH(1) command function, moving the value to DM[1]. On the simulator, if I toggle input 3, the pulsewidth measurement does not write to DM[1]. I also tried writing to a 32-bit word without success. I have not tried this with the actual PLC yet.
Does this command require a multiple pulses, or is it a limitation of the simulator?
Pulsewidth should be from rising to falling edge of a single pulse, so if multiple pulses are required is the Tri-PLC averaging the pulsewidth over x number of pulses?
Thank-you for your help!
Aaron
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The simulator does not support any of the interrupt based functions such as pulse measurement or interrupt. It is the limitation of the simulator. TRiLOGI is intended to be a generic programming tool for the PLC so we did not want to make it tie only to the specific I/O sharing structure of the T100MD+ PLC (where input 3,4,5,6 shares with the pulse measurement, HSC and interrupt pins). If you download the code to the real PLC it should work.