描述
将分支电路(并联电路块)与前面的电路串联连接时使用ANB指令,各并联电路块的起点,使用LD或LDNOT指令;与ORB指令一样,ANB指令也不带操作元件,如需要将多个电路块串联连接,应在每个串联电路块之后使用一个ANB指令,用这种方法编程时串联电路块的个数没有限制,若集中使用ANB指令,最多使用7次。
梯形图的设计与编程方法
梯形图是各种PLC通用的编程语言,尽管各厂家的PLC所使用的指令符号等不太一致,但梯形图的设计与编程方法基本上大同小异。
一、确定各元件的编号,分配I/O地址
Nokia NIF4211KIT 2 Port V.35 cPCI Int IP740
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Cisco BPX 8620 Switch BPX-MMF-155-8-BC 8-Port MM Fiber
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Alcatel OS7-GNI2-U2 2-port Universal Gigabit Ethernet
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Cisco BPX8600 BPX-BCC-4V/B Bband Controller BAA6EEBCAA
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Lucent Stinger STGR-LIM-T1-8 8 port T1 interface module
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