本教材采用常用的两种编程语言，一是梯形图，二是助记符语言表。采用梯形图编程，因为它直观易懂，但需要一台个人计算机及相应的编程软件；采用助记符形式便于实验，因为它只需要一台简易编程器，而不必用昂贵的图形编程器或计算机来编程。
虽然一些的PLC还具有与计算机兼容的C语言、BASIC语言、专用的语言（如西门子公司的GRAPH5、三菱公司的MELSAP），还有用布尔逻辑语言、通用计算机兼容的汇编语言等。不管怎么样，各厂家的编程语言都只能适用于本厂的产品。
l编程指令：指令是PLC被告知要做什么，以及怎样去做的代码或符号。从本质上讲，指令只是一些二进制代码，这点PLC与普通的计算机是完全相同的。同时PLC也有编译系统，它可以把一些文字符号或图形符号编译成机器码，所以用户看到的PLC指令一般不是机器码而是文字代码，或图形符号。常用的助记符语句用英文文字（可用多国文字）的缩写及数字代表各相应指令。常用的图形符号即梯形图，它类似于电气原理图是符号，易为电气工作人员所接受。
GE FANUC COMMUNICATIONS CONTROL MDL IC693CMM311F
FC1A-D1A1E IDEC MICRO-1 MICRO CONTROLLER NEW
REGENT’S CONTROLS INC. WATCHGUARD 120 SENSING RELAY NEW
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3G2A5-OA121 OMRON OUTPUT UNIT
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501-03410-01/50?2-02947-01 GIDDINGS & LEWIS ENCODER CARD
55700 MAS100 D14/D04 MURR ELEKTRONIK I/O MODULE NEW
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86-24-262 SOLA CUSTOM RECTIFIER POWER SUPPLY NEW IN BOX
137693 MILLER VOLTAGE BOARD NEW IN BOX
SQUARE D COMBINATION MOTOR CONTROLLER W/DISCONNECT
PC-1984-120 MODICON PROCESSOR MODULE 4K MEMORY
MAQ1-00300-000-?5-00 BARBER COLMAN TEMPERATURE CONTROL
C500-CT001, 3G2A5-CT001 OMRON COUNTER CONTROLLER
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473-0-0336 ROBOTRON FIRING BOARD
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SICK WS12-2D430 PHOTOELECTRIC EMITTER NEW WARRANTY
C500-ID213, 3G2A5-ID213 OMRON INPUT UNIT
RAPID AIR 69100033 REV. D CONTROL BOARD NEW
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RAPID AIR 69100035 PWB REV. B CONTROL BOARD NEW?
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8210G095 ASCO RED HAT VALVE NEW IN BOX
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LIVINGSTON WELDWISE 2400 THE POD RESISTANCE WELD MODULE
IC610MDL180A GE/FANUC RELAY OUTPUT MODULE NEW IN BOX
D3-16TD1-1 PLC DIRECT OUTPUT CARD NEW IN BOX
501-03438-00 P#502-02959-00 GIDDINGS&LEWIS AC INPUT BD
WILLIAMSON FIBERVIEW 1100 HIGH TEMPERATURE SENSOR?
FEDERAL PACIFIC ELECTRIC BUSWAY UNIT 60AMP
652-8-3000 ATC-TENOR TIMER
BARKSDALE MODEL#0428-030 USD7 PRESSURE TRANSDUCER NEW
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176B8013 DANFOSS ELECTRONIC DRIVE
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HELM INSTRUMENT CO. INC. STRAIN GAIN HT400 TRANSDUCER
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SAS AUTOMATION RPL 6 SENSOR LOGIC BOX AND LOGIC
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NOLATRON SERIES 4470 ANTI-TIEDOWN SWITCH MONITOR NEW
1600-PM3-05/(3)?1652-48-70-USD SCR POWER CONTROLLER
1600-PM2-01/(2)?1652-48-70-USD SCR POWER CONTROLLER
R46121 SKAN A MATIC AMPLIFIER W/TIME DELAY NEW IN BOX
8501XMO40V02 SQUARE D AC MASTER RELAY NEW IN BOX
