描述
在PLC内部存储器中有专用于输入状态存储的输入继电器区,各输入设备(开关、按钮、行程开关或传感器信号)的状态经由输入接口电路存储在该区域内,每个输入继电器可存储一个输入设备状态。PLC中使用的”继电器”并非实体继电器,而是”软继电器”,可提供无数个常开、常闭触点用于编程。每个”软继电器”仅对应PLC存储单元中的一位(bit),该位状态为”1″,表示该”软继电器线圈”通电,则程序中所有该继电器的触点都动作。输入继电器作为PLC接收外部主令信号的器件,通过接线与外部输入设备相联系,其”线圈”状态只能由外部输入信号驱动
Set of 4 Motorola Symbol MC9090-G WiFi Barcode Scanner
SYMBOL MOTOROLA RD5045-20511010-US KIT:RD5000-
LOT OF 3 SYMBOL, MOTOROLA MC7090-PK0DCRFA8WR, WM5,
Symbol / Motorola VC5090 Vehicle Mounted Mobile Compute
Lot 100 Batteries For Symbol Motorola 216731501 MC5040
SYMBOL MOTOROLA AP-5181-1304C-WR AP-5181:802.11A+G
Lot 100 Batteries For Symbol Motorola BTRY-MC35EABO2
Lot 100 Batteries For Symbol Motorola 82-90129-01 NEW
Lot 100 Batteries For Symbol Motorola 829012901 MC35
Symbol Motorola MC7094 Barcode HandheldScanner MC70 NEW
Symbol Motorola MC5040 -2D – MC50 – NEW – PIM Keyboard