The PLC control cabinet is a programmable cabinet that allows for control of motors and switches through electrical signals.
Overview
The PLC integrated control cabinet boasts several protection functions, such as overload protection, short circuit protection, and phase loss protection. It has a compact design, stable operation, and comprehensive features. The cabinet can be configured to meet specific control requirements and can be combined to form larger control systems.
The PLC control cabinet is versatile and can be used in a variety of industrial automation settings. It is widely used in industries such as electric power, metallurgy, chemical, paper, and environmental sewage treatment. The PLC control cabinet allows for both equipment automation and process automation control, resulting in optimized network functions. Its stability, scalability, and strong anti-interference capabilities are crucial to modern industry.
The PLC control cabinet can be customized to meet user needs, and can be paired with a human-machine interface touch screen for ease of use. The device can communicate with other systems through data transmission protocols such as Modbus, Profibus, and other industrial computer and Ethernet-based communication protocols.
Typical applications of the PLC control cabinet include constant pressure water supply systems, air compressors, fan pumps, central air conditioners, port machinery, machine tools, boilers, paper machinery, food machinery, and more.
Structure
The PLC control cabinet typically consists of the following five components:
- Air Switch: This is the main power control for the entire cabinet and every cabinet must have one.
- PLC: The PLC used should be selected based on the project requirements. For smaller projects, an integrated PLC may suffice, while larger projects may require modular or card-type PLCs, and even redundancy (i.e., two sets that can be used alternately).
- Power Supply: A 24VDC switching power supply is typically required. Most PLCs come with a 24VDC power supply, but whether it is needed or not depends on the specific project requirements.
- Relay: The PLC can directly send commands to the control loop, but it may also be routed through a relay first. For example, if the PLC output is 24VDC but the control loop requires 220VAC for the node, a relay must be added to the PLC output. The relay is activated when the command is issued, connecting the node of the control loop to the normally open or normally closed point of the relay. Whether or not to use a relay depends on the specific situation.
- Terminals: These are essential for every cabinet and the number of terminals required depends on the number of signals that need to be configured. For a simple PLC control cabinet, a basic set of terminals is required. However, if additional features are needed, such as supplying power to on-site instruments or connecting to a host computer, additional open spaces or switches may be necessary.
