在石油加工工业中，大型旋转机组是装置设备的重要组成部分，重油催化裂化气压机组的联锁-自保系统从满足工艺生产需求出发，考虑到安全性、可靠性、经济性、可扩展性等因素，采用了OMRON公司生产的CPM2AH型PLC进行系统构建，CPM2AH自带I/O接口，可以接36点输入，24点输出，输出形式是继电器，并且通过RS232C串口与PC机通讯，使生产过程表现稳定，动作可靠，在事故状态下对机组及生产装置实行了自我保护，杜绝了恶性事故的扩大和蔓延，取得了显著的效果。
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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