变量（有时被称为标签）是被命名的数据存储区。在工程中的所有变量都在变量浏览栏中被列出。每一个变量都会占用一个PLC的内存空间，所有的PLC系列（PACSystems™ RX7i除外）必须为每一个变量内存地址（如%R00001）。
HONEYWELL Part Number 060-J161-02 Model 43A LOAD CELL,
ATLAS COPCO 4220 1560 05 TENSOR CONTROLLER CABLE
FANUC A03B-0807-C151 POINT MODULE, NNB
COOPER CLECO 3/8″ DRIVE RIGHT ANGLE PNEUMATIC NUTRUNNER
ALLEN BRADLEY SLC 500 ANALOG I/O MODULE 1746-NIO4V SER.
ZF FRIEDRICHSHAFEN 4152 058 206 SERVO GEAR HEAD
GSE TECH-MOTIVE 710ABS-CAL00 ABS CALIBRATOR MODULE
VISIOTEC 633901 VISIOSCAN PINHOLE INSPECTION LENS
ARO 46800-731-2 MULTI-DRILL
AEG MODICON REMOTE I/O PROCESSOR MODULE AS-J890-101
AEG MODICON CENTRAL PROCESSING UNIT MODULE PCB C916-100
SUMITOMO CNHJS-G105Y-35 SM-CYCLO SPEED REDUCER, NNB
ALLEN BRADLEY, 1203-SSS, SERIES B POWERFLEX CONVERTER,
MODICON AS-P120-000 AC POWER SUPPLY, NIB, SEALED
DWYER 4002 500 PSIG CAPSUHELIC DIFFERENTIAL PRESSURE GA
VICTOR PROFESSIONAL FM 370 / 1000-0258 THREE GAS FLOW M
BUSSMANN, FWP-700, 700 A, 700 V, LOT OF 2, IN BOX S
