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。
存储容量与速度尽管国外各厂家的PLC产品大体相同
Auburn 42148 Ignitor Free Shipping!
Honeywell AQ2524M2 Boiler Control Panel
Numatics 082SA415M011Z Valve
Cisco N7K-C7018-FAB-1 Switch Fabric Module #7
Getty's Permanent Magnet DC Servo Motor ,
Micromatic Textron Servo Drive, MMC9314-M2-24, MMC93H,
Carrier HH 57ZC 003 Differential Enthalpy Switch HH57ZC003 Free Shipping!
Westinghouse P-YSA89X 32.1600.649-00 Electrocom PLC PCB Board
Telemecanique 2 HP Altivar 5 Variable Frequency Drive ATV452U15N SERIE 452, 45 2
Topworx Go Switch Leverless Limit Switch DCD358 Free Ship!
Honeywell R Input Module NO BOX
Total Source HY185872 SY31719 Spherical Bearing
10" SCA 3-Jaw Lathe Chuck, A8 Mounting, Made in Sweden,
Mannesman Rexroth 3WE6A60/EW110N9K4 Directional Control Valve
Savin 888124 Type 1036 Yellow Toner Cartridge OEM
URB 22218MBC3W33 Spherical Roller Bearing
Cutler Hammer D300AIM420C Analog Input
ASCO TM10A32B Pressure Switch
EASOM ESL ROTARY LIMIT SWITCH
Mitsubishi Circuit Board, FX884A, BN624A730G52,
Festo FENGKF Pnuematic Guided Cylinder
Eaton Vickers Manifold Valve 301174 TMW0413
ABB Kent Taylor 547TB01244A Transmitter
GE Fanuc #8F AC Servo Motor, # A06B-0348-B356,
OPTO 22 G4D32RS Remote Digital 32 Channel I/O Unit Mistic Circuit Board G4RS
Digital Equipment BN34A-4E ST to SC 4.5m Dual Fiber Optic Cable Free Shipping!
Omron 3G2A3-OD411 Module
Lg Qty PHD CVAS6V 32 X 35 -DB PNEUMATIC CYLINDER
Namco Controls Limit Switch EA Snap-Lock EA
Eaco Variphase 4050S2-XX-X-N Soft Start Motor Starter Series C V2 50HP 460V
READ DESCRIPTION Honeywell Advanced Communication Module
Force 10 Force10 PCB Board OPEN PACKAGING
Parker AP02B2YR35ANLSPD024D-6T Valve
OEM Genuine Ricoh G Cyan Developer Unit
Western Reserve Controls 1771-JMBJ Circuit Board PCB Free Shipping!
30 day Crouse Hinds CES2213 Receptacle excellent condition
Hauhinco S3P3310/E3-3IN Medium HFA 320(p) Bar Hydraulic Valve READ DESCRIPTI
ESW Electronic Systems Of Wisconsin Rev A PCB Board
Numatics 252SS43AM000061 252SS400M000061 Valve
Siemens EWSD S30810-Q1330-XX-5/01 Module
Brad Harrison MPIS 410P801 Multi-Port Interconnect System Mini-Change 8 Port
Mitsubishi Control Unit Rack, # UF01B, Meldas-M2A, * * * * * *
Toshiba / Tosnuc Transistor Servo, # ACTS40B,
Fanuc AC Spindle Servo Unit, A06B-6044-H018, A20B 22J,
Fanuc A16BA Board,
Parker UHP 07+442VFVF-Q 07-442VFVF-Q Valve
Yaskawa Hicup DC Servo Motor w/ Brake, UGHMED-20-TMA2,
