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As for the power supply, the power supply of PLC not only supplies power to PLC itself, but also supplies power to external instruments. In addition, the number of I / O modules (or expanded I / O modules) of PLC itself changes, so the change of load is relatively large. In terms of planning, we can only think according to the biggest consideration. However, because the power supply is a power equipment, it is easy to heat up. The temperature rise of the power equipment will further affect the functions of other surrounding equipment, especially when the over-current or over-voltage condition exists, it will burn out the components. However, if the margin is too large, the cost will be added a lot, Power supply module is a relatively easy to show some of the fault. In general, the problem to be solved is not only to select high-quality equipment, but also to consider a large enough margin in terms of planning at the expense of some costs.

Some of the communication, PLC in the use of some of the most customer complaints, PLC communication generally has a serial port (RS232, RS485), Ethernet, and industrial field bus network port. Because most of these communication methods come from personal computers, many standard communication interface standards are not very suitable for industrial field, such as voltage level, fault tolerance rate and so on. Therefore, the communication port presents the probability comparison of the problem. From the perspective of product planning, it is a very challenging task that how to enhance the adaptability of communication port to the outside world through the planning of software and hardware, and how to reduce the external interference to PLC internal communication through adopting various anti-interference methods. What's more, since it's communication, it must involve protocol issues, and it will also involve the other party of communication, such as computer, human-machine interface, other PLC, frequency converter, field intelligent instrument or intelligent equipment, etc. many communication failures are caused by the problem of communication object or communication parameter setting, rather than the real failure of PLC, This is to test the level and experience of the technicians who are responsible for debugging in the device and use of PLC.

Although the proportion of connector in the cost of PLC is not very large, it is the component that often presents fault in the process of using PLC. Poor touch is the most common phenomenon. Even if the terminal of PLC is well planned, if the user is not very careful in wiring, it will also present the problem of poor touch. If the identification of the terminal is not very clear and eye-catching, maybe the wiring personnel will be distracted, and the wrong line will be connected. If the strong current is connected to the signal terminal, the damage of PLC will be formed immediately.