Pulse program of the PLC program of ladder diagram

(1) the cycle adjustable pulse generators
As shown in Figure 5-6 using a continuous cycle adjustable pulse timers T0. X0 normally open after closing, for the first time when scanning to T0 normally closed contact, which is closed, and T0 the coil after 1s delay T0 normally closed contacts disconnect. T0 normally closed contacts disconnect the next scanning period when scanning to T0 normally closed contacts, because it is already fractured, T0 coil power, T0 normally closed contact with the back closed. So, in the next scanning period when scanning to T0 normally closed contact, and T0 coil, repeat above, T0 normally open continuous closed, broken, produces the pulse width for a scanning cycle, pulse cycle for continuous pulse 1s. Change the setting value of T0, you can change the pulse period.

5-6 cycle adjustable pulse generators
A) ladder diagram b) sequence diagram
(2) pulse generator with adjustable duty cycle
As shown in Figure 5-7 for the use of two timers, pulse, pulse for 5 seconds, duty to 3:2 (on-time: time). The on-time 3s, set by the timer T1, disconnect time of 2s, set by timers T0 and Y0 as pulse output.

5-7 duty adjustable pulse generators
A) ladder diagram b) sequence diagram
(3) sequence pulse generator
As shown in Figure 5-8A three pulse the timer results in a set order of the ladder program, pulse waveform in the order as shown in Figure 5-8B. When X4 connected, T40, delay, and Y31 power, timing L0S, T40 normally closed contacts disconnect Y31 to power down. T40 normally open contact closure, T41, delay and Y32 power when T41 timed 15s to Y32 power. T41 normally open contact closure and T42 time delay. Y33 power on T42 time 20s to Y33 power. If the X4 is still active, pulse start order until X4 disconnected. When X4 is off, all power and timer, reset timer contacts, all power outputs Y31, Y32, Y33.

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