Rockwell Automation 1785-BCM_BEM, D17856.5.4 PLC-5 Backup Communication Module User Manual - Manual (Page 30)

Installing Your PLC-5 Backup System
Chapter 3
3-7
The 1785-BCM series B module switch assembly SW1 is preset at the
factory to operate:
with another 1785-BCM series B module
in the Fast Data-Transfer mode. Fast data-transfer mode means that
when the secondary module receives a data block, it immediately
enables it to be read by the secondary processor.
Figure 3.3
1785-BCM Series B Switch Assembly SW1
Switch Assembly SW1
Top View
Toggle pushed
toward top
OFF (open).
Toggle pushed
toward bottom
ON (closed).
19085
Table 3.E
Setting 1785-BCM Series B SW1 Switches
When: Set this switch: To this position:
the other 1785-BCM module is a series A 1 1 ON (closed)
OFF (opened)
OFF (opened)
OFF (opened)
2 1 OFF (opened)
ON (closed)
ON (closed)
OFF (opened)
ON (closed)
OFF (opened)
the other 1785-BCM module is a series B 1 OFF (opened)
you want fast data transfer 2 2 ON (closed)
you want the secondary BCM module to enable
BTRs to the secondary PLC-5 processor only
when all blocks of a multi-block segment have
been received 2 2 OFF (opened)