Rockwell Automation 1747-BSN Backup Scanner Module - Manual (Page 173)

Publication 1747-UM010B-EN-P - September 2003
Specifications A-9
The total increase in the RIO scan time (T
btx
) is equal to:
T
btx
= sum of T
ri
for all logical racks
Example Discrete I/O Throughput with Block Transfers Present
An SLC 5/03 is using a backup scanner to control a 115.2K baud RIO
link that has 3 adapters and 4 logical devices.
Adapter #1 (1747-ASB module):
•
starting logical rack 0, logical group 0
•
12 logical groups (1 1/2 logical racks)
•
one 8 word and two 4 word BT write/read modules in logical
rack 0
•
one 2 word BT write/read module in logical rack 1
Adapter #2 (1771-ASB module):
•
starting logical rack 2, logical group 0
•
2 logical groups (1/4 logical rack)
•
one 64 word BT write/read module
Adapter #3 (1771-ASB module):
•
starting logical rack 2, logical group 2
•
2 logical groups (1/4 logical rack)
•
one 32 word BT write/read module