1785-BCM/C 是一款备份通信模块 （BCM）

1785-BCM/C 是一款备份通信模块 （BCM）

Allen-Bradley 1785-BCM 是与 PLC5 控制器平台一起使用的传统通信模块。该模块是一个单插槽机箱，用于提供从主 PLC 处理器到备用 PLC5 处理器的通信冗余和切换功能。该模块能够通过高速串行链路 （HSSL） 提供高速 Data Highway Plus （DH+） 和远程 I/O （RIO） 通信备份，切换速度高达 1.2 兆波特。

1785-BCM 还具有一个高达 4K 字的内部缓冲区，能够在不同事件（如电源故障、处理器错误（包括 1785-BCM 合作伙伴模块故障））时启动切换。此外，在手动从 RUN 切换到 PROGRAM 模式、REMOTE RUN 到 REMOTE PROGRAM 转换以及 REM RUN 和 REMOTE TEST 模式更改期间，也可能发生切换。

1785-BCM 兼容各种 PLC5 处理器，如 PLC-5/15 系列 B、-5/20、-5/25、-5/30、-5/40 和 -5/60 处理器。它安装在 1771 I/O 机箱上，键控位置介于 8 和 10 之间或 34 到 36 之间。它需要使用目录号为 1771-WG 的接线臂，以便快速端接到 1785-BCM 的通信线。

使用 BCM 时，不允许将输入和输出模块安装在安装处理器和 BCM 的同一机箱中。I/O 模块必须远程安装，充当分布式 I/O 站。

1785-BCM/C 是一款备份通信模块 （BCM）

The Allen-Bradley 1785-BCM is a legacy communication module used with the PLC5 controller platform. The module is a single slot chassis designed to provide communication redundancy and switching from the main PLC processor to the standby PLC5 processor. The module is capable of providing high-speed Data Highway Plus (DH+) and remote I/O (RIO) communication backup over a high-speed serial link (HSSL) with switching speeds of up to 1.2 megabytes.

The 1785-BCM also has an internal buffer of up to 4K words, capable of initiating the switch in the event of different events such as power failure, processor error (including the failure of the 1785-BCM partner module). In addition, switching may also occur during manual switching from RUN to PROGRAM mode, REMOTE RUN to REMOTE PROGRAM conversion, and REM RUN and REMOTE TEST mode changes.

The 1785-BCM is compatible with various PLC5 processors, such as PLC-5/15 Series B, -5/20, -5/25, -5/30, -5/40, and -5/60 processors. It is mounted on a 1771 I/O chassis with keying positions between 8 and 10 or 34 and 36. It required a link arm with catalog number 1771-WG to quickly end to the 1785-BCM communication line.

When using BCM, the input and output modules are not allowed to be installed in the same enclosure where the processor and BCM are installed. The I/O module must be installed remotely, acting as a distributed I/O station.