1747-6.22, Backup Scanner User Manual

A-186 Specifications
Throughput
Introduction
Processor Scan
Scanner
Processor
SLC Local
Chassis
Publication 1747-6.22
Scanner Scan
RIO throughput is defined as the time between when an input event
occurs at an I/O module in an RIO chassis to when an output event
occurs at an I/O module within the same RIO chassis. There are three
types of throughput concerning the 1747-BSN Backup Scanner
Module and its RIO network:
• discrete throughput (time from discretely mapped input to
discretely mapped output) without block transfers (BTs) present
• discrete throughput (time from discretely mapped input to
discretely mapped output) with BTs present
• BT throughput (time from when a BT is enabled to when the BT
successfully completes)
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
RIO Scan
Outputs to Modules
Inputs to Modules
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.
ASB Module
I/O Module
Inputs to Modules
ASB Backplane Scan
I/O Module
Remote Chassis Remote Expansion
Chassis
Outputs from Modules
Output Device