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SERIAL COMMUNICATION TRANSFORMATION METHOD OF PLC AND TRANSFORMATION SYSTEM THEREOF
SERIAL COMMUNICATION TRANSFORMATION METHOD OF PLC AND TRANSFORMATION SYSTEM THEREOF
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机译：PLC的串行通讯转换方法及其转换系统
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摘要
A serial communication transformation method for a PLC(Programmable Logic Controller) and a transformation system thereof are provided to enable a user to selectively assign the communication methods of RS-232C and RS-485(422) with a simple operation by mounting a converter circuit into a PLC communication device, thereby improving user's convenience and reducing cost. A serial communication transformation method for a PLC comprises the following steps of: initializing a communication device(S20); assigning a method for an external interface by recognizing mode setting information(S30); reading a setting value by an external mode setting switch or a switch value set by a program in a main CPU and ordering the enable of disable of an internal circuit(S40); and allocating a port by selectively driving one of a RS-422 circuit and a RS-232C circuit according to the order and driving the transceiving unit of the selected circuit(S50,S60); and storing a parameter value in a memory and continuously performing communication until power is off again(S70).
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