梯形图沿袭了继电器控制电路的形式,它是在电器控制系统中常用的继电器、接触器逻辑控制基础上简化了符号演变来的,形象、直观、实用。
梯形图的设计应注意以下三点:
(一)梯形图按从左到右、从上到下的顺序排列。每一逻辑行起始于左母线,然后是触点的串、并联接,最后是线圈与右母线相联。
(二)梯形图中每个梯级流过的不是物理电流,而是“概念电流”,从左流向右,其两端没有电源。这个“概念电流”只是形象地描述用户程序执行中应满足线圈接通的条件。
(三)输入继电器用于接收外部输入信号,而不能由PLC内部其它继电器的触点来驱动。因此,梯形图中只出现输入继电器的触点,而不出现其线圈。输出继电器输出程序执行结果给外部输出设备,当梯形图中的输出继电器线圈得电时,就有信号输出,但不是直接驱动输出设备,而要通过输出接口的继电器、晶体管或晶闸管才能实现。输出继电器的触点可供内部编程使用。
2.语句表编程语言
指令语句表示一种与计算机汇编语言相类似的助记符编程方式,但比汇编语言易懂易学。一条指令语句是由步序、指令语和作用器件编号三部分组成。
3.控制系统流程图编程图
控制系统流程图是一种较新的编程方法。它是用像控制系统流程图一样的功能图表达一个控制过程,目前国际电工协会(IEC)正在实施发展这种新式的编程标准0AC001.9 Accessory
0AC201.91 Lithium Battery Set
0AC240.9 Accessory
0AC301.9 Accessory
0AC401.9 Encoder Adapter
0AC808.9 Industrial Ethernet Hub Module
0AC808.9-1 Ethernet Hub
0G1000.00-090 RS485 Bus Connector
0GH-IP161 Programmable I/O Processor IP161
0MC111.9 PCMCIA memory card 2 MB FlashPROM
0PS104.0 DIN Mounted Power Supply 24VDC PS 104
0PS1050.1 24 VDC Single-Phase Power Supply PS1050
0TB708.91 Accessory
1A0550.02 Accessory
2AI300.6 Analog Input Module AI300
2AI700.6 Analog Input Module AI700
2AI730.6 Digital Output Module AI730
2AO300.6 Analog Output Module AO300
2AO725.6 Analog Output Module AO 725
2AO900.6 Analog Output Module AO900
2AT300.6 Analog Input Module AT300
2AT600.6 Analog Input Module
2AT610.6 Analog Output Module AT610
2BM100.9 Dummy Module BM100
2BP101.3 Base Plate Module BP100
2BP110.3 Base Plate Module BP110
2BP200.4 Single Connection Plate
2BP201.4 4 Position Connection Plate
2BP202.4 Single Connection Plate
2BP210.4 Single Connection Plate
2BP300.4 Base Plate Module BP300
2CP100.60-1 CPU Module CP100
2CP104.60-1 CPU Module CP104
2CP200.60-1 CPU Module CP200
2CP210.60-1 CPU Module CP210
2DI400.6 Digital Input Module DI400
2DI425.6 Digital Input Module
2DI426.6 32 inputs 24 VDC DI 426
2DI725.6 Digital Input Module DI725
2DI825.6 Digital Input Module DI825
2DO426.6 Digital Output Module
2DO428.6 Digital Output Module DO 428
2DO430.6 Digital Output Module DO 430
2DO600.6 Digital Output Module DO600
2DO700.6 Digital Output Module DO700
2DO710.6 Digital Output Module DO710
2DS100.60-1 Intelligent I/O Processor DS100
2DS101.60-1 Intelligent I/O Processor DS101
2EX100.50-1 Bus Controller Module EX 100
2EX200.50-1 Bus Controller Module EX 100
2EX301.5 Expansion Slave Module EX 301
2EX302.5 Expansion Module (Master) EX302
2IF100.60-1 Interface Module IF100
2IF101.60-1 Interface Module IF101
2ME913.90-1 Memory Module 1
2NC303.60-1 Ultrasonic Transducer Processing Module NC303
2NW100.50-1 Profibus Network Module
2PS425.9 Power Supply Module 24 VDC PS 425
2PS740.9 Power Supply Module
2TB120.9 Terminal Block 20-pin TB120
2TB140.9 Terminal Block 40-pin TB140
3AI350.6 Analog Input Module
3AI375.6 Analog Input Module 8 Inputs AI375
3AI775.6 AI775 Analog Input Module AI775
3AI780.6 Analog Input Module
3AM050.6 Analog Mixed Module
3AM051.6 Analog Input Module
3AM055.6 AM055 Analog Mixed Module
3AM374.6 AM374 Analog Mixed Module
3AO350.6 AO350 Analog Ouput Module AO350
3AO775.6 Analog Output Module AO775
3AT350.6 AT350 RTD Input Module
3AT450.6 AT450 Analog Input Module
3AT652.6 Analog Input Module
3AT660.6 Thermocouple Input Module
3BM150.9 BM150 Dummy Module BM150
3BP150.4 2005 Backplane - 15 Slots
3BP150.41 2005 Backplane 15 slots
3BP151.4 2005 Backplane 12 Slots
3BP151.41 2005 Backplane 12 Slots
3BP152.4 2005 Backplane 9 Slots
3BP152.41 2005 Backplane 9 Slots
3BP155.4 2005 Backplane 6 Slots
3BP155.41 2005 Backplane 6 Slots
3CP151.9 CP151 Control Processor Module
3CP152.9 CPU Module
3CP153.9 CP153 CPU Module CP153
3CP260.60-1 CP260 CPU Module CP260
3CP340.60-1 CPU Module
3CP340.60-2 CPU
3CP360.60-1 CPU Module
3CP360.60-2 CP360 CPU Module
3CP380.60-1 CPU
3CP382.60-1 CPU
3DI450.6 Digital Input Module
3DI450.60-9 DI450 Digital Input Module
3DI475.6 Digital Input Module
3DI476.6 Digital Input Module
3DI477.6 DI477 Digital Input Module DI 477
3DI486.6 DI486 Digital Input Module
3DI486.6-1 Digital Input Module
3DI695.6 Digital Input Module
3DI875.6 Digital Input Module
3DM455.60-2 DM455 Digital Mixed Module
3DM476.6 DM476 Digital Mixed Module 25450144312503290200
3DM486.6 DM486 Digital Mixed Module
3DO479.6 DO479 Digital Output Module DO479
3DO480.6 DO480 Digital Output Module
3DO486.6 DO486 Digital Output Module
3DO487.6 Digital Output Module
3DO650.6 Digital Output Module DO 650
3DO690.6 Digital Output Module
3DO750.6 DO750 Digital Output Module
3DO760.6 Digital Output Module DO760
3EX150.60-1 Remote I/O Master Module
3EX250.60-1 Remote I/O Save Controller
3EX282.6 Bus Controller Module
3EX350.6 EX350 I/O Master Controller
3EX450.66-1 Profibus DP Master Bus Control Module
3EX450.66-2 Profibus DP Master Bus Control Module
3EX450.76-1 Fieldbus Module
3EX450.77-1 Fieldbus Module
3IF050.6 Interface Module
3IF060.6 Interface Module IF060 IF060
3IF152.60-2 IF152 Programmable Interface Processor
3IF260.60-1 Programmable Interface Processor Module
3IF613.9 Interface Module IF613
3IF621.9 Communication Module
3IF622.9 Communication Module
3IF648.95 ARCNET IF648 Interface Module IF648
3IF661.9 Communication Module
3IF671.9 Profibuse Interface Module
3IF672.9 IF672 Interface Module IF672
3IF681.86 Communication Module
3IF681.96 Interface Module
3IF686.9 Communication Module
3IF722.9 Communication Module IF722
3IF761.9 Communication Module
3IF762.9 Communication Module
3IF766.9 Communication Module
3IF771.9 Communication Module
3IF772.9 aPCI Interface Module
3IF779.9 aPCI interface module 1 RS232 interface 2 CAN in
3IF781.9 Communication Module
3IF782.9-1 Communication Module
3IF786.9 Communication Module