用户程序存储器用于存放用户载入的PLC应用程序，载入初期的用户程序因需修改与调试，所以称为用户调试程序，存放在可以随机读写操作的随机存取存储器RAM内以方便用户修改与调试。
通过修改与调试后的程序称为用户执行程序，由于不需要再作修改与调试，所以用户执行程序就被固化到EPROM内长期使用。
PLC运行过程中需生成或调用中间结果数据(如输入/输出元件的状态数据、定时器、计数器的预置值和当前值等)和组态数据(如输入输出组态、设置输入滤波、脉冲捕捉、输出表配置、定义存储区保持范围、模拟电位器设置、高速计数器配置、高速脉冲输出配置、通信组态等)，这类数据存放在工作数据存储器中，由于工作数据与组态数据不断变化，且不需要长期保存，所以采用随机存取存储器RAM。
Siemens 6SE7021-6ES87-2DA0 Breaking Unit 6SE70216ES872DA0
PARKER PR322H0001 PISTON RING KIT 3-1/4"
7 BUSSMANN FUSETRON FRS-R-7 FUSES FRSR7
BANNER ENGINEERING IAM.753S FIBER OPTIC CABLE IAM753S
MATHESON FM-1000-VI METER J1-4A111-J703 FM1000VI
DAYTON 1XLL9 CENTRITUGAL COOLANT PUMP 3500 RPM, 2 HP, V
AJAX MAGNETHERMIC 72011A25 TEMPERATURE MONITOR BOARD
SQUARE D 8536-SAG11 AC MAGNETIC STARTER SER. B 8536SAG11
MICRON POSITION TRANSDUCER
APPLETON LB150-M MALL IRON UNILET LB150M
SIEMENS 6ESHD01-0AB0 ANALOG OUTPUT MODULE 6ES73325HD010AB0
TESCOM DIAPHRAM SENSED PRESSURE REGULATOR
SLO-SYN 230-TH TRANSLATOR DRIVE MODULE 230TH
SMC NCGLN20-UIA950095 CYLINDER NCGLN20UIA950095
5 BUSSMANN KTS-R-100 FUSES KTSR100
MGE S TOPAZ P8 POWER CONDITIONER S
ABB DSQC-323 MEMORY BOARD 3HAB5956-1
3 HUBELL HBL9330 RECEPTACLES
SUN HYDRAULICS CBEA-LHV VALVE CBEALHV
3 URD CTL-12-S56-10L CTL SENSOR CTL12S5610L
MEASUREX POWER SUPPLY WITH COMMUNICATION BOARD REV. C
3 FUSETRON FRS-R-6/10 FUSES FRSR610
ABB TAYLOR 6002BZ10200A MEMORY BOARD 6002BZ10200A-1335
CUSTOM CONTROL SENSORS 611GM1787 PRESSURE SWITCH
VERSA VALVES CGS-4232-NB1-228L-D024 SOLENOID VALVE CGS4232NB1228LD024
PARKER L SOLENOID AIR CONTROL VALVE
EFECTOR IS5045 PROXIMITY SWITCH IS-3002-BPOG
RELIANCE ELECTRIC AUTOMAX SA500 AC POWER MODULE
NSK 130BAR10-SFYNDBLP4A SUPER PRECISION BEARINGS 130BAR10SFYNDBLP4A
3 SPRECHER & SCHUH D7P-MP44 PUSHBUTTON D7PMP44
SAWAMURA DENKI SS32G-H3RLN A90LM DC GEARED MOTOR
GARDNER DENVER 180 DEGREE THERMO ELEMENT VALVE
HYSTER REPAIR KIT
LOT OF 36 ALLEN BRADLEY 1492-J6 TERMINAL BLOCKS
FAR SYSTEMS TAU-CPU01 A CPU CARD TAUCPU01A
PARKER L VALVE
