Rockwell Automation 1747-BSN Backup Scanner Module - Manual (Page 167)

Publication 1747-UM010B-EN-P - September 2003
Specifications A-3
RIO Network Throughput Components
The following components affect RIO network throughput:
•
the total SLC processor scan time
•
the total RIO link scan time
•
adapter(s) backplane scan time(s)
•
the backup scanner’s output delay time
•
the backup scanner’s input delay time
•
input module delay times
•
output module delay times
Calculating Throughput The 1747-BSN Backup Scanner’s throughput is determined by using
the formulas provided in this section.
Discrete I/O Throughput without Block Transfers (T
dm-nbt
) Present
The information in this section is used to calculate the discrete
throughput of the 1747-BSN Backup Scanner if there are no BTs
occurring on the RIO link to any chassis.
If BTs are present on the RIO link you must use the Discrete I/O
Throughput with Block Transfers (T
dm-bt
) Present section to determine
your throughput.
RIO Scan
Processor Scan
Scanner Scan
Scanner
Processor
I/O Module
I/O Module
ASB Backplane Scan
SLC Local
Chassis
ASB Module
Outputs from Modules
Output
Device
When the SLC control program detects that the remote input has
been turned on (via the scanner input image), it activates the
remote output device (via the scanner output image). Throughput
is then defined as the time between when the remote input
device is activated to when the remote output turns on.
Outputs to Modules
Inputs to Modules
Remote Chassis Remote Expansion
Chassis