存儲器主要有兩種：一種是可讀/寫操作的隨機存儲器RAM，另一種是只讀存儲器ROM、PROM、EPROM 和EEPROM。在PLC中，存儲器主要用于存放系統(tǒng)程序、用戶程序及工作數(shù)據。

    系統(tǒng)程序是由PLC 的制造廠家編寫的，和PLC的硬件組成有關，完成系統(tǒng)診斷、命令解釋、功能子程序調用管理、邏輯運算、通信及各種參數(shù)設定等功能，提供PLC運行的平臺。系統(tǒng)程序關系到PLC的性能，而且在PLC使用過程中不會變動，所以是由制造廠家直接固化在只讀存儲器ROM、PROM或EPROM中，用戶不能訪問和修改。

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TELEMECANIQUE 24-240V 10-200MA PHOTOELECTRIC SENSOR, XU9-M18MA230

ALLEN BRADLEY GUARDMASTER SAFETY SWITCH TLS1-GD2 101459

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FISHER 3-15PSI 4-20mA CURRENT TO PRESSURE TRANSDUCER (I/P) 3311 DS1J1 K5

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BIMBA 120V, 2-WIRE, 20mA, REED SWITCH MRS-.087-PBL-31 *NEW*

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SICK 10-30VDC 100MA ELECTRONIC PHOTO SENSOR, VL18-3P3140

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UFM TYPE-4 FLOW METER SN-IIF4GM-6-.99?C1.0-A1WR-1D

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CAPP SENSING PROBE 215 4T2-7700

TURCK 20-250VAC PROXIMITY SWITCH BI2-CRS260-ACZ3?0X2-B313/S

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DESTA CO PEPPEREL-FUCHS SENSOR KIT 82G80-E4

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BANNER MULTI BEAM SCANNER BLOCK SBDX1 16648

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NUMATICS ACTUATOR 1A, 6-24VDC HALL EFFECT SENSOR AH6-002

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WALKER SCIENTIFIC HAND-HELD GAUSSMETER MG-4D

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