摘  要：本文以基于MODBUS通信协议的三相电量采集模块为研究对象，首先介绍了通用的MODBUS通信协议，然后以实例介绍了三菱L系列PLC同电量采集模块之间的RS485通信解决方案。

关键词：三菱L系列PLC   电量采集模块   MODBUS

Abstract: A three-phase power acquisition module based on MODBUS protocol is chosen as a research object, this paper first introduces the general MODBUS communication protocol, and then introduced an example that to realize the communication with MITSUBISHI L series PLC by RS485 mode.

Key words: MITSUBISHI L series PLC Power acqu