X80 Rack Extender Module
Original instructions
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Physical Description
A BMXXBE1000(H) rack extender module contains a LED diagnostic panel, a pair of connectors for the X bus extender cables, and a set of switches for addressing the X80 extended racks. 
1
rack extender module LEDs 
2
female 9-pin SUB-D connectors for bus cables 
3
rack address switches
Rack Address Switches
Assign a unique address to each X80 extended rack. Use the 4 microswitches on the side of the rack extender module to set each rack address.
Switch
Rack Address
0
1
2
3
4
5
6
7
1
OFF
OFF
OFF
OFF
ON
ON
ON
ON
2
OFF
OFF
ON
ON
OFF
OFF
ON
ON
3
OFF
ON
OFF
ON
OFF
ON
OFF
ON
4
Not used
By default, the rack extender module is set to address 0 (all switches OFF). Address 0 is reserved for the main rack, which contains the CPU or an adapter module (CRA module) in the case of X80 RIO drops. You can assign addresses 1 through 7 to the X80 extended racks in any order. Assign a unique rack address to each extended rack.
NOTE:
A collision can occur if you assign:
  • the same rack address to more than one X80 extended rack
  • address 0 to any rack other than the main local rack
When a collision happens, one of the racks with the duplicate rack address does not operate.
To recover from a collision:
Step
Action
1
Turn OFF the power supplies in the racks that have an address mismatch.
2
Set unique, correct rack addresses via the address switches on the rack extender module.
3
Reapply power to the racks.
Rack Extender Module LEDs
The LEDs on the rack extender module provide information about the rack in which it resides:
LED
Pattern
Indication
RUN (green)
ON
Module is functioning normally.
OFF
  • The power supply is no longer present.
  • An error has been detected in the extender module.
COL (red)
ON
Rack address collision detected:
  • Two or more racks have been assigned the same rack address.
  • A rack that does not contain the CPU has been assigned address 0.
OFF
Each extended rack has a unique address.
0 to 7 (green):
ON or OFF
Rack address.
Confirm that each extender module has only one address LED set to ON.
Module Consumption
This table shows the power consumed by the BMXXBE1000 extender module:
Consumption/Power Type
Description
consumption on 3.3 Vdc power supply
22 mA
dissipated power on the 3.3 Vdc rack power supply
73 mW
consumption on 24 Vdc rack power supply
160 mA
dissipated power on the 24 Vdc rack power supply
3.84 W