基于MMS协议的设备间通信和任务同步

Communication and Tasks Synchronization between Devices Based on the MMS Protocol

ＣＩＭＳ环境是多进程和多任务的，必须实现进程间的任务同步．ＭＭＳ是支持ＣＩＭＳ中制造设备和自动化系统之间通信的标准语言，但在ＭＭＳ服务定义和协议规范中不存在明显的同步概念．针对这个不足之处，本文在简要介绍ＭＭＳ协议和设备间通信的基础之上，给出了采用ＭＭＳ信号量和事件对象及相应服务实现ＣＩＭＳ环境中多任务同步的方法．

CIMS environments are multi processing and multi tasking ones, so it is of essence to accomplish tasks synchronization between processes. MMS is a standard tool for communications among manufacturing devices and automation systems in CIMS. Unfortunately, there is no explicit synchronization concept in the MMS service definition and protocol specification. In this paper, we first give a survey of MMS protocol and communications among various devices. Next, we propose an approach to implement the tasks synchronization in CIMS environments using MMS semaphore object, event object and corresponding services.