Use PLC adopts counter for motor starting stop - - programmable logic

1. A single button control motor starting stop.

(1) the counter to start stop control of motor, control circuit with a button ( X0。 When press the button X0, by M0 normally closed contacts make counter CO coil to count, count to 1 and equal to the value 1, CO contact action, Y0 coil electricity, to control the motor starting, although the first scan cycle Y0 contact closure, but M0 normally closed contacts disconnect, C0 not reset, release button X0, Y0 continue to electricity.

2. When the first press the button X0, CO in the coil to electricity, but has reached the set point, so no longer count, count value is 1, still because Y0 contact closure, CO, CO contact disconnect, yukio okamoto, lose electric coil, electric motor to stop. The second scan cycle M0 normally closed contacts disconnect, CO of coil electricity and release button X0, Y0 is not electricity. The diagram below:

2. A disk with PLUC control

(1) the rotation of the disk is controlled by a motor, for every turn 1 turn to press the start button after stop after 3 s, turn to stop after five laps.

2. The disc with a limit switch to detect rotating laps, control ladder diagram as shown in the figure below. Control principle is as follows: the disc in the initial state when under pressure limit switch X1 press the starting button X0, yukio okamoto, coil electricity and self-locking, rotating disk, limit switch X1 reset. Counter is reset to zero CO, M1 electric locking, the timer T0 access circuit.

(3) the disc rotate, when touch block encounter pressure and the lower limit position switch X1, the X1 normally closed contacts disconnect yukio okamoto, coil lifting self-locking, disc stalling, the X1 normally open contacts closed, M0 coil electricity, its role is in the second scan cycle MO normally open contacts closed, prepare for the next rotation. Counter CO count one more time. Timer TO electricity, a pulse delay 3 s, make Y0 coil electricity and self-locking, again the disc rotation. Disk every turn count, when the count value is 5, counter C0 normally closed contacts disconnect Y0 coil, all process is over.

M1 (4) the picture will T0 timer access after used for starting, in order to prevent the in situ X1 contact delay start automatically when closed.

3。 The use of high speed counter method is described below.

( 1) A phase a counting input high speed counter.

1. Phase one count of C235 ~ C245 input the serial number of the high-speed counter, a total of 11 points, their way of counting and contact action is the same as the ordinary 32-bit counter. Make and counting, when the count reached set value, contact action and maintain; Make count reduction, less than the set value is reset. The counting methods depends on the corresponding special auxiliary relay M8235 ~ M8245.

(2) the figure below shows a count as a phase type high speed counter. Figure ( 一) Only a count of C235 input X0, when closed X12 M8235 electricity, C235 way to count, instead of counting methods. When closed X12, C235 input X0 to count the pulse count, and 32-bit internal counter, as in counting mode, when the count is greater than or equal to value, C235 contact action. When X11 closed C235 reset.