PLC control cabinets refer to programmable control cabinets, which are complete sets of control cabinets capable of controlling motors and switches. PLC control cabinets feature protection functions such as overload, short circuit, and phase loss protection.

PLC Control Cabinet Overview

The PLC integrated control cabinet features overcurrent, short-circuit, and phase-loss protection functions. It boasts a compact structure, stable operation, and comprehensive functions. It can be assembled according to the actual control scale, enabling single-cabinet automatic control or multi-cabinet systems connected via industrial Ethernet or fieldbus networks to form a distributed control system (DCS). The PLC control cabinet is adaptable to various industrial automation control scenarios of different sizes. It is widely used in industries such as power, metallurgy, chemicals, papermaking, and environmental protection wastewater treatment.

PLC Control CabinetFunction

PLC control cabinets can complete equipment and process automation control, achieving perfect network functions with stable performance, scalability, and strong anti-interference capabilities, serving as the core and soul of modern industry. They can be custom-designed according to user requirements, including PLC control cabinets and variable frequency cabinets, to meet user needs. They can also be paired with human-machine interface touch screens for easy operation. The equipment can also communicate via data transmission protocols such as DCS master station modbus, profibus, etc., and can be controlled and monitored by industrial computers, Ethernet, etc.

PLC Control CabinetStructure

A PLC control cabinet typically includes the following five components:

1. Air circuit breaker

A master air switch, this controls the power to the entire cabinet. Something every cabinet must have, I believe.

2、PLC

This depends on the engineering requirements. To put it simply, for smaller projects, a single integrated PLC might suffice. However, for larger projects, a modular, card-based system may be necessary, along with redundancy (i.e., two systems alternating use).

3. Power Supply

A 24VDC switch power supply; most PLCs come with a built-in 24VDC power supply. Determine whether you need this switch power supply based on actual necessity.

Relay

PLC instructions can be sent directly to the control loop, but may first be relayed through a relay. To illustrate, if your PLC's output is 24VDC, but the control loop diagram requires a 220VAC node supplied by the PLC, you will need to add a relay to the PLC output. This means the relay will actuate when the instruction is sent, and then the control loop node will be connected to the relay's normally open or normally closed contact. Whether to use a relay is also determined by the specific situation.

5. Wire Connectors

This is definitely a must-have for every container, configurable based on the number of signals. If it's just a plain PLC control cabinet, these items are typically required. If your control cabinet needs additional components, you can add them as needed. For instance, if you need to power certain on-site instruments or small control boxes, you might have to increase the number of circuit breakers. Or, if you need to connect the PLC to a host computer, you may need to add switches and the like. It varies depending on the situation.

PLC Control CabinetBrand

Key Brands: American AB, ABB, Panasonic, Siemens, Huaqiang, Mitsubishi, Omron, Delta, Fujitsu, Schneider, MITSUBISHI, Yonghong, etc.

PLC Control CabinetTerms of Use

Power Supply: DC 24V, Single-phase AC 220V, (-10%, +15%), 50Hz

Protection Rating: IP41 or IP20

Environmental Conditions: Temperature range between 0℃ and 55℃; prevent direct sunlight exposure; relative air humidity should be less than 85% (no condensation). Keep away from strong vibration sources; avoid frequent or continuous vibrations with frequencies between 10-55HZ. Avoid corrosive and flammable gases.

PLC Control CabinetApplication Fields:

Typical Applications: Constant-pressure Water Supply, Air Compressors, Fans and Pumps, Central Air Conditioning, Port Machinery, Machine Tools, Boilers, Papermaking Machinery, Food Processing Machinery, etc.