Preface: Programmable controller referred to as PLC, is a microprocessor-based generation of general-purpose industrial controller. Because of its flexible control performance, simple and easy to use performance, can adapt to the reliability of various industrial environments, so in the field of industrial automation to take a wide range of applications.
In the large-scale automated production line commonly used to control the operation of the PLC, when the need for each relay only to perform a specific action, the use of traditional output control mode requires multiple PLC output point to control. Which takes up a lot of PLC output, so that the output control circuit becomes complex, in the troubleshooting took a lot of time also increased the cost of equipment.
This paper focuses on the principle of PLC output matrix control, and expounds its application in automation control.
Thesis content:
First, PLC matrix output application:
Our company is engaged in a garment dyeing and finishing machinery research and production company. In the actual production due to take into account the equipment of the automatic control requirements, often use the PLC to control the equipment. In the process of using the PLC, for example: in the electronic formula weighing machine used in the PLC to control more than 120 solenoid valves, if the use of traditional control mode to control the back to take back a lot of PLC output points. This increases the cost of the equipment. And PLC output matrix control can be a good solution to this problem.
Second, PLC output matrix control principle:
PLC output matrix control is a PLC output using the control load common wiring, the following Mitsubishi FX series, for example, the schematic diagram is as follows:
1, the working principle:
The following chapter will use the eight-point output PLC as an explanation, PLC output with Y0 ~ Y3 as output control solenoid valve DT1 ~ DT16, Y4 ~ Y7 output control intermediate relay KA1 ~ KA4, through KA1 to KA4 normally open contact output matrix Control signal and Y0 ~ Y3 combination of control solenoid valve action. The buttons SB1 to SB7 are signal input buttons.
When the solenoid valve DT1 is required, press the button SB1PLCY0 to output a signal to make the solenoid valve ready. At the same time press the button SB2 Y4 has output, the middle relay KA1 action, DC power module 24V power through the KA1 normally open contact and DT1 positive terminal DT1 action. Similarly, when the need for solenoid valve DT2 action only need to disconnect Y4 output Y5 output can be connected.
PLC output Y0 ~ Y3 can be parallel to the four-hole cable to the solenoid valves DT1 ~ DT4, DT5 ~ DT8, DT9 ~ DT12, DT13 ~ DT16 the negative side of the connection is as follows:
As can be seen, the circuit is to rely on two points off to achieve the purpose of control, which is the same as the matrix 4X4 can control 16 components, if you can use 8X8 64 components can be controlled. So that the output of the control components will be multiplied to be expanded.
I use the Mitsubishi FX series PLC as the production of equipment control, PLC points, the more expensive the more expensive, the use of PLC output matrix output can effectively reduce the cost of equipment, while the equipment wiring, maintenance and so on Can be more beautiful and convenient.
Third, the summary:
Through the experiment can know, PLC output matrix control can be very good savings
PLC output point, so that the equipment production costs and maintenance costs to a very good control.
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