HIMA F8652X CPU module
We know that reliability is very important for industrial production. Every producer wants to keep his production line in good condition, but the fact tells us that it is impossible. We can try to avoid equipment problems and reduce the possibility of problems. At this time, the PLC control system is much better than the original relay control. In fact, we can see this from the appearance of both sides. After all, there are more circuits in the relay control system, and the installation and removal are more complex. Many lines are densely interwoven, which is not only easy to damage the lines due to mutual friction, but also easy to interfere with the signal electromagnetic wave in the other line. The PLC equipment is relatively simple and rule-based, and is not easy to be damaged by self-interference.
CPU module
CPU module is mainly composed of microprocessor (CPU chip) and memory. In the PLC control system, the factory CPU module is equivalent to the human brain. It continuously collects input signals, executes user programs, and refreshes the output of the system; Memory is used to store programs and data.
2. I/O module
Input module and output module are referred to as I/O module. They are the eyes, ears, hands and feet of the system and the bridge between external field devices and CPU modules.
The input module is used to receive and collect input signals, and the switch input module is used to receive slave buttons; Switch input signals from selector switch, digital dial switch, limit switch, proximity switch, photoelectric switch, pressure relay, etc; The analog input module is used to receive continuously changing analog current and voltage signals provided by potentiometers, tachogenerators and various transmitters.
The switch output module is used to control the output devices such as contactor, solenoid valve, electromagnet, indicator light, digital display device and alarm device, while the analog output module is used to control the actuator such as regulating valve and frequency converter.
The working voltage of CPU module is generally 5V, while the input/output signal voltage of PLC is generally higher, such as DC 24V and AC 220V. The spike voltage and interference noise introduced from the outside may damage the components in the CPU module or make the PLC unable to work properly. In the I/O module, optical coupler, photoelectric thyristor, small relay and other devices are used to isolate the internal circuit and external I/O circuit of PLC. In addition to transmitting signals, I/O modules also have level conversion and isolation functions.
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