存储区还包括 PLC 内部各类软设备(逻辑线圈、计时器、计数器、数据寄存器和累加器等)的存储区。该存储区又分为具有失电保持的存储区域和无失电保持的存储区域，前者在 PLC 断电时，由内部的锂电池供电，数据不会遗失；后者当 PLC 断电时，数据被清零。

BICOM 34 CONTROLLER

JOHNSON CONTROLS P72AA-27C OPEN LOW PRESSURE CONTROL, N

GRINNELL LC-8501-3 SERIES 8000 BUTTERFLY VALVE, 2.5″, 2

ALLEN BRADLEY 802M-NX22, LIMIT SWITCH BODY ONLY, 24 VDC

LIFT TECH 328914-03, PENDANT STATION, 4 BUTTON, ENCLOSU

WIDELL 164907, PIPE DIE, M68 X 4.0, HSS, 8 FLUTE, 2.450

WIDELL M46 X 3.0, PIPE DIE, HS, 6 FLUTE, 1.735″ ID

DWYER 4001C 500 PSIG CAPSUHELIC DIFFERENTIAL PRESSURE G

GE FANUC 16 POINT RELAY OUTPUT MODULE IC693MDL940G MIS

PARKER 932679Q 10Q OL FILTER ELEMENT, NIB

USON DUAL HI TRANSDUCER CONVERTER MODULE 432A301B

USON SINGLE HI TRANSDUCER CONVERTER MODULE 432A301B

FANUC ROBOTICS ER-2 COMMUNICATION INTERFACE BOARD A20B-

SOLA 24V 10A ELECTRONICALLY PROTECTED DC POWER SUPPLY S

PARKER 932679Q 10Q TM FILTER ELEMENT, NIB