GE 8521-EB-MT On site interface module
Many hardware components are affected by various factors, and 8521-EB-MT may undergo different changes. Therefore, the internal fault tolerance processing of 8521-EB-MT is already a large workload. Programming in these areas of 8521-EB-MT does not have certain rules and precedents to follow, and relies entirely on experience.
In addition, regarding some external environmental impacts, 8521-EB-MT includes electromagnetic interference, temperature changes, signal errors, communication errors, and various signal exceeding changes. 8521-EB-MT also has human operation errors, such as programming errors, wiring errors, and operational errors; It is necessary to carry out necessary fault-tolerant planning, which relies on experience accumulation.
The reliability of a product is originally reflected in its failure rate, and the lower the failure rate, the higher the reliability. To reduce the failure rate, PLC manufacturers first need to identify the factors that cause the failure, which requires analyzing the internal structure and external environment of the PLC.
From the internal structure of PLC, it can be divided into two major parts: software and hardware, and software is further divided into underlying software, user software, and programming software; Hardware is divided into several parts, including CPU, power supply, I/O, communication, connectors, and mechanical structure.
Firstly, analyze the failure rate of PLC hardware. Due to the special program structure of PLC, the magnitude of failure rate in CPU and I/O circuits is primarily related to hardware construction planning, selection of raw materials, and production process.
The selection of hardware planning and meta equipment primarily depends on the level and experience of research and development, and after several generations of product use, problems can be identified. For manufacturers with a certain history and scale of use, this can be well controlled.
In terms of production process, manufacturers with their own production lines can analyze the characteristics of their own production lines through repeated production, especially the shortcomings of the production process. Therefore, even if there are problems with the first two batches of each product, they can diagnose the faults to improve and improve the production line. Therefore, there are not too many problems in this regard.
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