本文描述了基于西門子通訊模塊CP-340 的PLC 與MAN B&M 柴油主機通訊的船舶自動監控系統設計與應用。通過西門子可編程控制器S7-300 及CP-340 通訊模塊，并基于RS-422 現場總線協議對船舶柴油機的滑油壓、油溫、淡水壓力、燃氣溫度等模擬量和水位、油艙高位等開關報警量進行監控，并顯示在機艙控制臺的各儀表和顯示器上，實現了船舶機艙的自動監控。經在大中型船舶機艙中的實際應用表明，該監控系統功能完善、性能優良、可靠性高，完全能夠滿足船舶航行的要求標準。
關鍵詞： 船舶柴油機；PLC（S7-300）； 通訊模塊（CP-340）；現場總線(RS-422）
Abstract: This article described design and application of the automatic monitoring system of shipping based on communication of CP-340 module and MAN B&M diesel. According to programmable controller S7-300 and CP-340 module, analog quantities such as the oil pressure to the shipping engine, temperature of oil ,freshwater pressure, temperature of gas-fired, etc and the switch amounts such as water level, etc are controlled based on RS-422 local bus, and they are displayed on monitor. It is shown that the system with high function, good property and high reliability can meet the requirement of Shipping sails.
Keywords: shipping engine；PLC；S7-300；CP-340；RS-422