Rockwell Automation 1785-BCM_BEM, D17856.5.4 PLC-5 Backup Communication Module User Manual - Manual (Page 23)

Understanding the 1785-BCM
Hardware Components
Chapter 2
2-7
Through its connection with the I/O chassis backplane, the 1785-BCM
module can execute block transfer read (BTR) and block transfer write
(BTW) instructions from a PLC-5 processor. With the inherent
block-transfer queuing capabilities of the PLC-5 processor, multiple
block-transfer instructions per program scan can be executed to the same
1785-BCM module.
This chapter described the hardware components of the 1785-BCM
module. Now that you are familiar with the module and some of the
backup concepts for the PLC-5 backup system as described in chapter 1,
you are ready to install the backup system. Chapters 3 and 4 describes
installation procedures for the PLC-5 backup system (1785-BCM and
1785-BEM modules, respectively).
I/O Backplane Interface
What to Do Next