在石油加工工業中，大型旋轉機組是裝置設備的重要組成部分，重油催化裂化氣壓機組的聯鎖-自保系統從滿足工藝生產需求出發，考慮到安全性、可靠性、經濟性、可擴展性等因素，采用了OMRON公司生產的CPM2AH型PLC進行系統構建，CPM2AH自帶I/O接口，可以接36點輸入，24點輸出，輸出形式是繼電器，并且通過RS232C串口與PC機通訊，使生產過程表現穩定，動作可靠，在事故狀態下對機組及生產裝置實行了自我保護，杜絕了惡性事故的擴大和蔓延，取得了顯著的效果。
GE Versamax IC200ALG325 is an analog output module, 13 bit voltage 8 channel. The GE Versamax IC200ALG325 provides eight analog voltage outputs ranging from either –10vdc to +10vdc (bipolar) or 0v to +10VDC (unipolar). The GE Versamax channels are 8 single-ended, one group.
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