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以西门子S7-200系列CPU214PLC和XK3102通用型称重仪表为例,介绍了基于PLC自由口通讯技术实现称重仪表与PLC之间的通讯方法及其通讯协议、硬件连接和软件设计等技术。在此基础上稍加改进,可应用到国内衡器界大多数具有串行通讯接口的通用型称重仪表上,使通用型称重仪表拓展使用到定量秤、配料秤、减量秤、非连续累计秤、灌装秤和网络化称量系统等许多工业计量领域,大大缩短了专用衡器的设计周期并降低了生产成本,具有一定的参考应用价值。
Taking Siemens S7-200 series CPU214PLC and XK3102 universal weighing instrument as an example, the paper introduces the communication method between weighing instrument and PLC based on PLC free port communication technology, its communication protocol, hardware connection and software design. On this basis, a slight improvement can be applied to the majority of the domestic weighing community with universal serial communication interface weighing instruments, the general expansion of the use of weighing instruments to quantitative scales, batching scales, weight scales, non-continuous Accumulated scales, filling scales and networked weighing system, and many other industrial measurement areas, greatly reducing the dedicated weighing instrument design cycle and reduce the cost of production, has a certain reference value.