alter the PLC program...

in the post before, I've put my PLC program, but while running the programme, it's not fulfil the specification for my main objective. So that, the programme have been alter by adding edge triggered wiping relay and remove the on delay from the programme.

Edge triggered wiping relay Short description

 An input pulse generates a pre-set number of output pulses with a defined pulse/pause ratio (re-trigger able), after a configured delay time has expired.

above is the programme that have been altered by adding edge triggered wiping relay where the pulse for the red line is about 20m which equal to 20 seconds.

above is the last result output while the programme run. after the 3 system function simultaneously ( water pump 1, water pump 2, exhaust fan) about 20 seconds, the last output will get out  with the green color where shows the smoke at the last stage are not dirt, if the smoke on the last stage still dirt, last sensor will shows the red color of LED. the red LED are not programme through PLC Logo because the sensor was in separate system. It just to show the smoke still dirt or not.