用以存放用户程序即存放通过编程器输入的用户程序。PLC的用户存储器通常以字（16位/字）为单位来表示存储容量。同时，由于前面所说的系统程序直接关系到PLC的性能，不能由用户直接存取。因而通常PLC产品资料中所指的存储器型式或存储方式及容量，是对用户程序存储器而言。
常用的用户存储方式及容量型式或存储方式有CM0SRAM，EPR0M和EEPR0M。信息储存常用盒式磁带和磁盘。
CM0SRAM存储器是一种中高密度、低功能、价格便宜的半导体存储器，可用锂电池作为备用电源。一旦交流电源停电，用锂电池来维持供电，可保存RAM内停电前的数据。锂电池寿命一般为1―5年左右。
运行用户程序
AUTONICS ATE-30S (2EA) TIMER
PepperL + Fuchs, MPD4HD, Photoelectric Sensor Switch
Mitsubishi, FR-A024-0.75K-UL, Freqrol-A024 Inverter 3PH 1HP 5A VFD Drive Motor N
Honeywell Sensotec LFH 2000lb load cell loadcell sensor
Sensotec DM Meter Display
Allen Bradley 806-A12 Reversing Drum Switch A12C Starter Contactor Mill
KEYENCE FU-37 SENSOR
ORIENTAL 4RK25GN-A (UNCLEAN) MOTOR
Parker, PVP2330R210, Variable Volume Hydraulic Pump
Allen Bradley, 100-FA13, Auxiliary Contact 1NO 3NC
Sommer Automatic GP1810NC-B/05 JE/72455 Robot Gripper
PANASONIC MSMA5AZC1Q AC SERVO MOTOR
Allen Bradley, 802M-KX, Limit Switch Operating Head Plunger Roller
Cle Forge 940 High Speed Drill Taper Shank Morse Bit 25/32" 32HS .78125 USA HSS
Sensotec ZZG 7 Pressure Transducer 3000psig 0-10VDC Honeywell
SANYO DENKI (UNCLEAN) STEPPING MOTOR
Sunx, FX-7J, Photoelectric Sensor Switch
Tyco Keystone Valve Actuator F79U 003 221 952 79U 010 Avid AL-011-D00 740CWP
Dwyer Model 2002 Magnehelic Pressure Gauge
Beckhoff, KL2012, Analog Input Terminal
IWAKI FDC-1 PUMP CONTROLLER
Advance Ballast RCN2S8635M F96T8/HO High Output T8 120v
Allen Bradley, 802T-H1TP, Oiltight Limit Switch
Pacific Scientific, P70360-PNN, Stepper Motor Control Drive Controller
Honeywell, ST7800 C 1003, Purge Timer 7Sec
ORIENTAL 2CSMGK-101 (UNCLEAN) MOTOR
10 Ten bag Roto Bore Rotobore .318" drill bit boring
Panasonic Nachi MDM212Q2V AC Servo Motor 2.1kW Ser.# N
Allen Bradley, 1494F-L1, Door Hardware Kit Type 12
Allen Bradley, 20DD3P4A3EYNACHNE, PowerFlex 700S Drive 3.4A 3PH 480VAC VFD Varia
ORIENTAL MBM 3GN3K AC MAGNETIC BRAKE MOTOR
Parker PSM-A12 80230 Step Module Memory Sequencer
Allen Bradley 1756-ENET/A Ethernet TCP/IP interface PLC
Magnecraft, Relay Socket Base 10A 300V Struthers Scheider
Advantage Electronics 918500 Board Module 3B08312 3074
SUNX FX-7 SENSOR
Turck, PKG 3Z-2, U Pico Fast Connector Cable Wire Snap-on Picofast
Turck, BI 3U-EM12E-AP6X2-H1141/S1589, Proximity Switch Sensor
Rexroth RS-485 Output Card Module V1.07 Siemens
Allen Bradley, 100-SA10, Aux Auxiliary Contact Contactor Block 1NO
ORIENTAL 3RK15GN-A (WITHOUT CONNECTOR) MOTOR
Grayhill 70M-ODC5 Output Module 2.5-10VDC 3A 0536 Rev.H
Fanuc A16BC Processor CPU Board
Adsens Tech, CS-18P-QD, Quick Disconnect Sensor
Nordson, M style Hose Extension Cable Electric Cordset 15m 50ft
YASKAWA SGMAS-04ACA4C VRSF-LB-S9C-400 (BROKEN) MOTOR
Cutler-Hammer C383PS2403 Power Supply 24VDC 300MA 81.000.3000.0 WRS-T