描述
读输入阶段。每次扫描周期的开始，先读取输入点的当前值，然后写到输入映像寄存器区域。在之后的用户程序执行的过程中，CPU访问输入映像寄存器区域，而并非读取输入端口的状态，输入信号的变化并不会影响到输入映像寄存器的状态，通常要求输入信号有足够的脉冲宽度，才能被响应。
Allen Bradley 1745-M1/1745M1 Ser B Memory
One-day shipping available
ALLEN BRADLEY 1745-E101 PROGRAMMABLE CONTROLLER
Expedited shipping available
Allen Bradley 1745-E101 1745E101 SLC 100 Expansion Unit
1745-E151/A ALLEN BRADLEY SLC-150 EXPANSION UNIT
ALLEN BRADLEY 1745-LP101 PROGRAMABLE CONTROLLER
ALLEN BRADLEY 1745-C1 USPP 1745C1
Allen-Bradley SLC 100 PLC cat 1745-E101
NEW Allen Bradley SLC PLC Programmer Cable 1745-C1 B
1745-E101 Allen Bradley SLC 100 Expansion Unit 1745E101
ALLEN BRADLEY 1745-800 USPP 1745800
ALLEN BRADLEY 1745-850 USPP 1745850
Allen Bradley 1745-PCP Remote Comms. Power Supply
ALLEN BRADLEY PROCESSER UNIT, PART.# 1745-E101, SER. A
