用PLC改造大龄远洋货船机舱集中监测报警系统

Renovating the engine room centralized moniforing and alarming system of aged ships by using the PLC

本文对用PLC改造大龄远洋货船机舱集中监测报警系统进行阐述，介绍了硬件接线图及程序梯形图，总结了系统的特点。

The paper introduced the application of PLC in renovating the engine room centralized monitoring and alarming system of aged ships. Detailed presentation is given to hardware line connection diagrams, programming block diagrams, and summerized the advantages of the system.