Working Principle of HIMA Z7126

1. Quadruple Redundancy Hardware Architecture

• If all four results are consistent, the system is determined to be normal, and control commands are output;
• If a single processor shows a result deviation, a majority voting mechanism (3 out of 4 consistent results are sufficient) is used to isolate the faulty unit and ensure correct output;
• If the deviation exceeds the fault-tolerance range, a safety response (such as output cutoff or entry into a safe state) is triggered immediately to prevent hazardous output.
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2. Safety Logic Operation and Signal Processing

• The program complies with the IEC 61131-3 standard and supports programming methods such as ladder diagrams and function block diagrams;
• It conducts validity verification on input signals (e.g., open-circuit detection, signal timeout judgment) to filter out abnormal data;
• According to preset logic, control commands are output to actuators (e.g., valves, motors) to implement safety control (such as emergency shutdown and interlock protection).

3. Fault Detection and Fault-Tolerance Mechanism

• Hardware level: Real-time monitoring of the status of components such as processors, memory, power supplies, and communication interfaces. Faulty components are automatically isolated once detected;
• Software level: Regular execution of verification programs to check program integrity (preventing code tampering) and operation consistency;
• Communication redundancy: Supports dual-channel Ethernet, CANopen, and other communication interfaces to ensure uninterrupted communication with I/O modules and upper-level computers.

4. Safe State Guarantee

• Cut off all output signals to prevent hazards caused by incorrect control commands;
• Send fault alarm information to the upper-level computer via indicator lights and communication interfaces;
• Retain fault memory to facilitate subsequent diagnosis and maintenance.

Z7126 HIMA PDF

Cert_DNV_HIQuad_X_Type_Approval_TAA000032E_E_E_PU00013623 (1)

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