Throughput Introduction; Rio Network Throughput Components - Allen-Bradley 1747-SN User Manual

A–2 Specifications

Throughput Introduction

Processor Scan
Scanner
Processor
SLC Local Chassis
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.
Publication 1747 6.6 - July 1996
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-SN Series B Scanner
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 scanner's output delay time
the scanner's input delay time
input module delay times
output module delay times
Scanner Scan
RIO Scan
Outputs to Modules
Inputs from Modules
ASB Module I/O Module
Remote Chassis
Inputs to Modules
Input Device
ASB Backplane Scan
I/O Module
Remote Expansion Chassis
Outputs from Modules
Output Device