PLCs (Programmable Logic Controllers) and Industrial PCs (Industrial Control Computers) are both important components in the field of industrial automation, but there are some significant differences between them. Here are some of the main differences between them:
First, the function and purpose:
PLC is a specialized digital controller, mainly used for control and execution functions in industrial automation. It is mainly discrete signal input and output, logic operations, data acquisition and control execution.
An industrial control computer is a more generalized computer device used in a variety of fields such as industrial automation control, robot control, and visual inspection. Through free programming, it can realize a variety of complex control functions.
Second, programmability:
PLC programmability is mainly reflected in the use of specialized PLC programming language, such as ladder diagrams (Ladder Diagram) or structured text (Structured Text). These programming languages are easy to learn and use, but relatively more limited.
Industrial computer can be programmed using a variety of programming languages, such as C + +, Visual Basic, etc., with a higher degree of programming flexibility, but programming may be relatively difficult.
Third, the hardware and interface:
PLC hardware interfaces mainly include RS485 and Ethernet interfaces, as well as specialized communication modules for the CPU and the connection of sensors and actuators connected to the sub-station for data communication.
Industrial control computers, on the other hand, usually have a variety of communication interfaces, such as PCI, PCIE, serial port, Ethernet port, USB, etc., for data interaction with other devices.
Fourth, stability and reliability:
PLC is designed specifically for industrial environments, its hardware and software after rigorous testing and verification, has a high degree of stability and reliability, suitable for industrial environments for long periods of stable operation.
Although the industrial computer also has a certain degree of stability and reliability, but because of its greater emphasis on versatility, so in some industrial environments may not be as stable as PLC.
Fifth, the price:
Because of the generality and high performance of industrial control computers, its price is relatively high.
PLC performance is limited, but the price is relatively low, suitable for use in cost-sensitive industrial applications.