The PLC cycle scanning work step ( In ac motor relay control circuit, for example).

1 cycle mixer PLC controller work requires several steps (' experience' Generally for 5) Several steps in order, the 'scan' 1 times the time, referred to as the 'T' scan cycle. Pieces in pieces the typical values of T = 10 ms program, the longer the greater the T. Pieces T is too big, can lead to PLC controller control. 【 Case 1 - in the background 1 】 Ac motor - — Relay lengths ( Rev. Stop) Control circuit - — M electricity if the motor rotates, the contactor KM of self-preservation contact suddenly loose, M? Contactor - — Text symbols KM - — Main contact rated current is big, is used to control the electric main current of the circuit and power - — The auxiliary contact ( Rated current 3 a or 5 a) - to - auxiliary circuit thermal relay - — Text symbols FR - — The heating element - series in - electric main circuit - — The heating element of the current action - setting into - the rated current of the motor - — The physical contact - for - auxiliary circuit - — Heating element [ Power cuts] To wait for 3 to 5 min, physical contact [ Can be automatically reset or manual reset]
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