PLC control cabinets refer to programmable control cabinets, which are complete sets of control cabinets capable of controlling motors and switches. PLC control cabinets are equipped with 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 either single-cabinet automatic control or a distributed control system (DCS) with multiple cabinets via industrial Ethernet or fieldbus networks. 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 achieve equipment and process automation control, providing perfect network functions with features such as 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. Additionally, they can be paired with human-machine interface touchscreens for easy operation. The equipment can also communicate via data transmission protocols such as DCS bus master, modbus, and profibus; and can be controlled and monitored through industrial computers, Ethernet, and other means.

PLC Control CabinetStructure

PLC control cabinets generally include the following five components:

1. Air Circuit Breaker

A master circuit breaker, which controls the power for the entire cabinet. Something every cabinet must have, I believe.

2、PLC

This depends on the engineering requirements. For instance, if the project is small, it might just be a single integrated PLC. However, for larger projects, a modular, card-based system may be necessary, along with redundancy (meaning two sets alternating in use).

3. Power Supply

A 24VDC switching power supply. Most PLCs come with an integrated 24VDC power supply. Decide whether to include this switch power supply based on the actual need.

Relay

Generally, PLCs can directly send commands to the control loop, but they may first be relayed through a relay. To illustrate, if your PLC's output is 24VDC, but the control loop diagram requires a 220VAC supply from the PLC, you must add a relay to the PLC output. This means that when the command is issued, the relay operates, and then the control loop node is connected to the normally open or normally closed contact of the relay. Whether to use a relay is also determined based on the situation.

5. Terminal 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, adjust accordingly. 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 higher-level computer, you may need to add switches and the like. It varies depending on the situation.

PLC Control CabinetBrand

Major Brands: U.S. AB, ABB, Panasonic, Siemens, Inovance, Mitsubishi, Omron, Delta, Fujitsu, Schneider, Hikvision, Yung-Ho, and more.

PLC Control CabinetTerms of Use

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

Protection Level: IP41 or IP20

Environmental Conditions: Temperature range of 0℃-55℃; prevent direct sunlight exposure; relative air humidity should be less than 85% (no condensation). Keep away from sources of strong vibration; prevent 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.