描述
PLC控制系统的程序设计要点。PLC控制系统I/O分配，依据生产流水线从前至后，I/O点数由小到大;尽可能把一个系统、设备或部件的I/O信号集中编址，以利于维护。定时器、计数器要统一编号，不可重复使用同一编号，以确保PLC工作运行的可靠性。程序中大量使用的内部继电器或者中间标志位（不是I/O位），也要统一编号，进行分配。
RELIANCE ELECTRIC 45C-271 NSPP 45C271
RELIANCE ELECTRIC 3RA2003 USPP 3RA2003
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Expedited shipping available
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Reliance Electric Company 0-52808 Circuit Board USED
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RELIANCE ELECTRIC T18R1101F-YL USPP T18R1101FYL
RELIANCE ELECTRIC T18R1102N-VQ USPP T18R1102NVQ
