针对铝冶炼企业沉降槽耙机负荷报警装置已不能达到实时监控的实际问题,设计了一套基于西门子公司S7-200 PLC在线微机监测报警系统。介绍了系统硬件组成、PLC控制程序的编制以及监控界面设计。该系统实现了同时在线监测2个烧结法分离沉降槽的耙机负荷,有效提高了设备的运转效率。实践证明,该系统稳定可靠,响应快,精度高。 Aiming at the actual situation that the aluminum smelter settling tank rake load alarm device can not reach the real-time monitoring, a set of on-line microcomputer monitoring alarm system based on Siemens S7-200 PLC is designed. Introduced the system hardware composition, PLC control program establishment as well as the monitor contact surface design. The system realizes the on-line monitoring of two rake load separated by sinter settling tank, which effectively improves the operation efficiency of the equipment. Practice has proved that the system is stable and reliable, fast response and high accuracy.