User guide

Hardware Planning
108
890 USE 108 00 August 2001
Planning a Stacked Drop Layout
Overview of
Stacked Drop
Layout
Backplanes in a drop may also be stacked on two DIN rails and connected by a BXT
201 (30-pin female-to-female connectors) bus extension cable, or a BXT 203 (30-
pin female-to-male connectors) bus extension cable. There may be either one or two
racks on each DIN rail. (See Using a BXT 201 Cable (30-Pin Female-to-Female
Connectors), p. 108 if using a BXT 201 cable; see Using a BXT 203 Cable (30-Pin
Female-to-Male Connectors), p. 111 if using a BXT 203 cable.)
Using a BXT 201
Cable (30-Pin
Female-to-
Female
Connectors)
A DTA 200 primary backplane and up to three secondary backplanes may be
mounted in a drop. The four backplanes can be stacked in two rows on two DIN rails
and connected via a BXT 201 bus extension cable.
Note that there can be only one BXT 201 cable per system.
CAUTION
Case 1 and Case 2 are the ONLY legal configurations
Due to the I/O module addressing method used, the stacked drop
layouts shown in Case 1 and Case 2 are the ONLY legal configurations!
Failure to observe this precaution can result in injury or
equipment damage.
Note: The BXT 201 cable connectors are polarized and must be connected
properly-the A connector must be attached to the top backplane, and the B
connector must be attached to the bottom backplane.