Installation guide

68 Estimating Network Performance
890 USE 100 00
BP85 Bridge Plus Queueing
Messages which must pass through multiple bridges will be queued (if
necessary) within the first bridge, but will not be queued within any
subsequent bridges in the transaction path. Figure 29 shows an
example.
CONTROLLER
A
PEER
PROCESSOR
MODBUS PLUS NETWORK
CONTROLLER
B
PEER
PROCESSOR
MODBUS PLUS NETWORK
PEER
PROCESSOR
MODBUS PLUS NETWORK
PEER
PROCESSOR
BRIDGE PLUS
PEER
PROCESSOR
PEER
PROCESSOR
BRIDGE PLUS
ORIGINATION
DESTINATION
Figure 29 BP85 Bridge Plus Queueing
A message from controller A to controller B must pass through two
Bridge Plus devices. If a path is not available in the first bridge, the
message will be queued and given a path when one is available. If the
second bridge does not have a path when it receives the message, the
message will not be queued further. An error code will be returned
from the second bridge and can be sensed by the application program in
controller A.