PLC Control Cabinet

PLC control cabinet refers to the programmable control cabinet, which can realize the electrical cabinet controlled by the motor and switch.

PLC Control Cabinet


The PLC integrated control cabinet has protection functions such as overload, short circuit and phase loss protection.

It has a compact structure, stable operation and complete functions.

It can be combined according to the actual control size.

It can realize automatic control of single cabinets, and can also realize multi-cabinet distributed control (DCS) control system through industrial Ethernet or industrial field bus network.

PLC control cabinet can adapt to industrial automation control occasions of various sizes.

Widely used in electric power, metallurgy, chemical, paper, environmental sewage treatment industries.

The PLC control cabinet can complete equipment automation and process automation control to achieve perfect network functions.

The characteristics of stable performance, scalability, and strong anti-interference are the core and soul of modern industry.

PLC control cabinet, frequency conversion cabinet, etc. can be designed according to user requirements, to meet user requirements, and can be matched with human-machine interface touch screen for easy operation.

The device can be connected with the data transmission of the DCS bus host computer modbus, profibus and other communication protocols; the control and monitoring realized by the industrial computer and Ethernet.

Typical applications: constant pressure water supply, air compressors, fan pumps, central air conditioners, port machinery, machine tools, boilers, paper machinery, food machinery, etc.


The PLC control cabinet generally includes the following five parts:

Air switch

A total air switch, this is the power control of the entire cabinet.

I believe that every cabinet must have one air switch.


This should be chosen according to the needs of the project.

For example, if the project is small, it can be directly an integrated PLC.

However, if the project is relatively large, it may require modules and card-types, and may also require redundancy (that is, two sets of alternate use).

Power supply

A 24VDC switching power supply.

Most PLCs come with a 24VDC power supply.

Depending on whether you really need it or not, you need this switching power supply.


The general PLC can directly send the command to the control loop, but it may also be relayed by the relay first.

For example, if the output of your PLC is 24VDC, but the picture drawn in your control loop needs 220VAC for the node, then you must add a relay to the PLC output, that is, the relay is activated when the command is issued, then the node of the control loop is connected to the normally open or normally closed point of the relay.

It is also possible to choose whether or not to use the relay depending on the situation.


This must be something that is essential for every cabinet, depending on the number of signals that can be configured.

If you just need a simple PLC control cabinet, you need these things. If you need other things in your control cabinet, you can see the situation increase.

For example, if you are likely to supply power to some on-site instruments or small control boxes, you may have to increase the number of open spaces.

Or if you want the PLC to connect to the host computer, you may need to add the switch.

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