PLC control cabinet refers to the programmable control cabinet, the control cabinet refers to the complete set of control cabinet, can realize the control of the motor, switch electric cabinet. PLC control cabinet with overload, short circuit, lack of phase protection and other protection functions.
PLC control cabinet introduction
PLC integrated control cabinet with overload, short circuit, lack of phase protection and other protection functions. It has compact structure, stable work and complete function. Can be combined according to the actual control gauge size, not only can achieve a single cabinet automatic control, but also can achieve a multi-cabinet through industrial Ethernet or industrial fieldbus network composition of distributed (DCS) control system. PLC control cabinet can adapt to various sizes of industrial automation control occasions. It is widely used in electric power, metallurgy, chemical industry, papermaking, environmental protection sewage treatment and other industries.
PLC control cabinet function
PLC control cabinet can complete equipment automation and process automation control, achieve perfect network function, stable performance, scalability, strong anti-interference and other characteristics, is the core and soul of modern industry. PLC control cabinet and frequency conversion cabinet can be designed according to user needs to meet user requirements, and can be matched with man-machine interface touch screen, to achieve the purpose of easy operation. The device can also communicate with the host computer of DCS bus modbus, profibus and other communication protocol data transmission; Industrial computer, Ethernet and other implementation of control and monitoring.
PLC control cabinet structure
PLC control cabinet generally includes the following five parts:
Air switch
A general air switch, this is the power control for the entire cabinet. Believe that every cabinet must have one thing.
PLC
This should be chosen according to the project needs. For example, if the project is small, it can be directly an integrated PLC, but if the project is relatively large, it may need modules, card type, but also may need redundancy (that is, two sets of alternate use).
The power supply
A 24VDC switching power supply, most of the PLC is its own 24VDC power supply, according to whether really need to determine whether to the switching power supply.
relay
In general, PLC can directly send instructions to the control loop, but it may also be transferred by relay. For example, if your PLC outlet is charged 24VDC, but your control loop diagram needs PLC for the node is 220VAC, then you have to add a relay at the PLC outlet, that is, when the command is issued relay action, but then let the control loop node connected to the relay normally open or normally closed point. The use of relays also depends on the situation.
terminal
This is definitely a must in every cabinet and can be configured depending on the number of signals. If just a simple PLC control cabinet is basically the need for these things, if you need to have other things in the control cabinet will see the situation increase. For example, you may need to power certain field meters or small control boxes, you may need to increase the number of switches. Or if you want PLC to connect to the top computer, you may need to add switches. It depends.
