PLC output matrix control principle - Database & Sql Blog Articles

First, plc matrix output application:
Our company is a company engaged in the research and production of garment dyeing and finishing machinery. In actual production, due to the automatic control requirements of the equipment, the PLC is often used to control the equipment. In the process of using PLC, for example, PLC is used to control more than 120 solenoid valves in the electronic formula weighing and dropping machine. If the traditional control method is used for control, it will occupy a lot of PLC output points. This increases the cost of the device. The matrix control of the PLC output can solve this problem very well.
Second, the principle of PLC output matrix control:
The PLC output matrix control is a wiring method for controlling the load common terminal of the PLC output. The following uses the Mitsubishi FX series as an example. The schematic diagram is as follows:

1, working principle:
The following chapter will use the 8-point output PLC as an explanation. The PLC output uses Y0~Y3 as the output control solenoid valve DT1~DT16, Y4~Y7 output control intermediate relay KA1～KA4, and the normally open contact output matrix through KA1 to KA4. The control signal is combined with Y0 to Y3 to control the action of the solenoid valve. The buttons SB1 to SB7 are signal input buttons.
When the solenoid valve DT1 is required to be actuated, pressing the button SB1PLCY0 outputs a signal to prepare the solenoid valve. At the same time, when button SB2 is pressed, Y4 has an output, and intermediate relay KA1 operates. The DC power supply module 24V is powered by the KA1 normally open contact and the DT1 positive terminal is turned on by DT1. Similarly, when the solenoid valve DT2 is required to operate, it is only necessary to turn off the Y4 output and turn on the Y5 output.
The PLC output terminals Y0~Y3 can be connected to the solenoid valves DT1~DT4, DT5~DT8, DT9~DT12, DT13~DT16 by the four-hole cable. The connection is as follows:

As can be seen from the figure, the circuit relies on the on and off of two points to achieve the purpose of control. This can control 16 components by using 4X4 like a matrix. If 8X8 is used, 64 components can be controlled. The control elements thus output are expanded exponentially.
Our company uses Mitsubishi FX series PLC as the control for equipment production. The more points of PLC, the more expensive the price is. The matrix output of PLC output can effectively reduce the cost of equipment, and at the same time make the wiring and maintenance of equipment. Can be more beautiful and convenient.
Third, summary:
Through experiments, we can know that PLC output can be saved by matrix control.
The PLC output point makes the production cost and maintenance cost of the equipment very good.