Functional Features
Power Supply: It inputs 24V DC power and outputs 5V DC power, providing the required 5V power and corresponding grounding for the I/O rack. The 5V DC power is used for the microprocessor system and as the control current of the I/O module. It is generated by the 24V DC power supply of the system through the 24V DC/5V DC power supply module controlled by the clock marked F7126.
High Reliability: HIMA’s H41/51g system adopts a CPU quadruple structure (QMR). The four microprocessors form a redundant control unit with 2 identical CU modules, and adopt a dual 1002D structure, namely 2004D structure. It has a powerful fault – tolerance function, so that any component failure in the system will not affect the normal operation of the system. Compared with the traditional triple structure, its fault – tolerance function is more perfect.
Diagnostic Function: Each I/O module can automatically store 500 diagnostic messages, and the processor module can automatically store 2500 diagnostic messages. The maintenance log will record all operation information, such as reinstallation, download, operation, stop, forced operation, etc. Moreover, all diagnostic information can be transmitted to DCS, which is convenient for users to monitor the system and troubleshoot faults.
Communication Function: It supports open communication structures, such as RS485, Profibus and Ethernet OPC, etc., which can facilitate data interaction and communication with other devices or systems, and realize a wider range of system integration and control.

Application Fields
Chemical Industry: In chemical production processes such as fertilizer projects, it is used in the SIS system (Safety Instrumented System) of ammonia synthesis plants and urea plants to ensure the safe and stable operation of the production process and prevent safety accidents caused by abnormal process parameters or equipment failures.
Other Industrial Fields: It can also be applied to other industrial fields with high safety requirements, such as petroleum, natural gas, electric power, pharmaceutical industry, etc. It is used to realize the safety control and protection of key equipment and process flows, and ensure the reliability and safety of the production process.