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PLC EXTENSION MODULE INTERFACE METHOD USING MULTI-DROP SERIAL COMMUNICATION TECHNIQUE
PLC EXTENSION MODULE INTERFACE METHOD USING MULTI-DROP SERIAL COMMUNICATION TECHNIQUE
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机译:基于多点串行通讯技术的PLC扩展模块接口方法
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摘要
The present invention relates to a method for an effective extension module interface of a programmable logic controller (PLC) which manages multiple extension modules by using a new serial communication technique rather than a technique of requesting/responding. According to the present invention, a PLC extension module interface method using a multi-drop serial communication technique can reduce CPU waiting times needed to occupy and release a transmission (Tx) line to share the transmission line, which connects a reception terminal of the CPU to a transmission terminal of each of multiple modules in a PLC system controlling the multiple modules by using a serial communication technique. Accordingly, the CPU can drastically reduce delays in communication with each of the modules and consequently can reduce response time of the entire system due to effects of reducing the duration of the cycle thereof.
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