Rockwell Automation 1747-ASB Remote I/O Adapter - Manual (Page 133)

Publication 1747-UM006B-EN-P - June 2003
Specifications A-5
RIO Scan Time Calculation (T
RIO
)
The RIO scan time is calculated by identifying the baud rate and
image size of each logical device on the RIO link. Locate the
corresponding time value in the following table. If you are using
multiple logical devices, add the time values together to determine the
total RIO scan time (T
RIO)
.
T
RIO
= T
adapter 1
+ T
adapter 2
+ T
adapter 3
Table 8.2 RIO Scan Times for Adapters
(1)
(1) The table shown above is based on PLC-5 processors. If another type of processor is used, refer to its user
manual for T
RIO
.
Adapter Size Baud Rate
57.6K 115.2K 230.4K
1/4 logical rack 6.0ms 3.5ms 2.5ms
3/4 logical rack 7.5ms 4.5ms 3.0ms
Full logical rack 9.5ms 5.5ms 3.5ms