Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 177)

ASCII Module
PLC-2 Family Processors
Appendix A
AĆ9
Example Problem 1
A PLC-2/30 programmable controller is controlling 4 I/O racks in remote
configuration (Figure A.4). An ASCII module is located in each rack.
Assume that 64 words are transferred in each read and two words are
transferred in each write operation and that the ladder diagram program
contains 4K words (K=1024). There are no other block transfer modules
in the system.
Figure A.4
Remote System Example
PLC-2/30
1772-SD
1771-AS
1771-DA
Rack No. 1
1771-AS
1771-DA
Rack No. 2
1771-AS
1771-DA
Rack No. 3
1771-AS
1771-DA
Rack No. 4
10,000' System
11840
What is the worst case time between two consecutive read block transfers
from the same module in this system?
Solution