1756-IM16I/ABPLC模块
控制系统可以根据生产的需要将液位分为多段来设定，并分段显示，当液位为低*自动启动料泵加液，液位到达设定值时发出声光报警，并停泵；操作人员可通过确认按钮解除音响报警信号，闪烁灯光转平光；系统具有手动/自动两种控制方式，并设有试验功能。
目前在国内市场上有从美国、德国、日本等国引进的多种系列PLC，国内也有许多厂家组装、开发数十种PLC，故PLC系列标准不一，功能参差不齐，价格悬殊。在此情况下，PLC的选择应着重考虑PLC的性能价格比，选择可靠性高，功能相当，负载能力合适，经济实惠的PLC。本文介绍以四段液位控制对象为例，据对多种因素的分析比较及监控系统输入、输出点数的要求，选用日本立石（OMRON）公司C20P型PLC。
1756-IM16I/ABPLC模块
1756-IB32 VDC INPUT 32PTS
1756-IC16 VDC INPUT 16PTS
1756-IF16 ANALOG INPUT-CURRENT/VOLTAGE 16PTS
1756-IF6I ISOLATED ANALOG INPUT-CURRENT/VOLTAGE 6PTS
1756-IF8 ANALOG INPUT-CURRENT/VOLTAGE 8PTS
1756-IH16I VDC ISOLOTED INPUT 16PTS
1756-IM16I VAC ISOLATED INPUT 16PTS
1756-IN16 VAC INPUT 16 PTS
1756-IR6I ISOLATED RTD INPUT 6PTS
1756-IT6I ISOLATED THERMOCOUPLE/MV INPUT 6PTS
1756-IV16 VDC SOURCING INPUT 16PTS
1756-L1 LOGIX5550 PROCESSOR, 64KBYTE USER MEMORY
1756-L1K CONFORMALLY COATED LOGIX 5550 PROCESSOR W/160KBYTE BASE MEMORY
1756-L1M1 LOGIX5550 PROCESSOR, 512KBYTE USER MEMORY
1756-L1M1K CONFORMALLY COATED LOGIX 5550 PROCESSOR W/512KBYTE BASE MEMORY
1756-L1M2 LOGIX5550 PROCESSOR W/ 1M BYTE EXPANSION MEMORY
1756-L1M2K CONFORMALLY COATED LOGIX5550 PROCESSPR W/1MBYTE EXPANSION MEMORY
1756-L1M3 LOGIX5550 PROCESSOR WITH 2MBYTE EXPANSION MEMORY
1756-L1M3K CONFORMALLY COATED LOGIX5550 PROCESSPR W/2MBYTE EXPANSION MEMORY
1756-M02AE 2-AXIS MOTION MODULE
1756-M08SE 1756 8 AXIS SERCOS SERVO MODULE
1756-M1 LOGIX5550 512KBYTE EXPANSION MEMORY
1756-M1K CONFORMALLY COATED LOGIX5550 EXPANSION MEMORY
1756-M2 LOGIX5550 1MBYTE EXPANSION MEMORY
1756-M2K CONFORMALLY COATED LOGIX5550 EXPANSION MEMORY
1756-M3 LOGIX5550 2MBYTE EXPANSION MEMORY
1756-M3K CONFORMALLY COATED LOGIX5550 EXPANSION MEMORY
1756-MVI CLX MULTI VEND INTF
1756-MVID MULTI-VENDR INTF DEV KIT
1756-N2 EMPTY SLOT FILLER CARD
1756-OA16 74-265 VAC OUTPUT 16PTS
1756-OA16I 74-265 VAC ISOLATED OUTPUT 16PTS
1756-OA8 74-265 VAC 2 AMP OUTPUT 8PTS
1756-OA8D 74-132 VAC DIAGNOSTIC OUTPUT 8PTS
