There is a very common kind of circuit in Mitsubishi PLC - the persistence circuit. The insistence circuit means that when the external input switch is a button, it can be pressed through the insistence circuit to press the button to insist on the output, similar to the self-locking in the electrical diagram. Let's take Mitsubishi PLC as an example to write a sticking circuit.
First, we use X0 as the external input signal, and X0 is connected to the external button. Click the mouse on the right side of the left bus of the PLC software and enter "ld x0".
2. Insist that the circuit needs to have a button to control its disconnection, we choose to connect X1 to an external button to control its disconnection, and connect X0 with the normally closed contact of X1 in the PLC software, and enter "ldi x1".
3. Take Y0 as the output of the PLC, and input "OUT Y0" after the normally closed contact of X1.
Fourth, in the first step of the program, as long as the button is pressed, Y0 can have an output, and the output of the button is also disconnected when the button is released. As long as the normally open contacts of Y0 are connected in parallel at both ends of the X0 of the button, the output of Y0 can be maintained. Enter "OR Y0"
5. If you do not use the self-locking method to control Y0, you can use the set and reset commands to adhere to the output status, such as steps 4 and 6. After writing the program, press F4 to convert, and then press the test button to write the program to the imitation PLC.
6. Click the "Menu Start" of the test dialog box - relay memory supervision.
7. In the monitoring dialog box, the X and Y monitoring pages are called up, and click the Soft Component - Bit Soft Component window. At this time, you can click X0 and X2, double click X0 twice is equivalent to the function of the button, then find that Y0 has now insisted on the output status, press X1 again to exempt. Pressing X2 will make Y1 stick to the output, and pressing X3 will reset Y1.
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