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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.
