Input, Output And Configuration Files For The; Very High Speed Counter On; Controlnet; About The Controlnet Adapter - Allen-Bradley 1794-VHSC User Manual

Chapter Objectives

About the ControlNet
Adapter
Communication Over the
FLEX I/O Backplane

ControlNet

Adapter
Network
Allen-Bradley Spares
Input, Output and
Configuration Files for the

Very High Speed Counter on

ControlNet
In this chapter you will learn about:
ControlNet Adapter
I/O structure
safe state data
communication fault data
idle state behavior
input data behavior upon module removal
This module must be used with the FLEX I/O ControlNet adapters
(cat. no. 1794–ACN15 series B and –ACNR15 series B or later)
which support extended data transfer (EDT). These adapters
interface up to 8 FLEX I/O modules and a ControlNet processor or
scanner. The adapter can support ControlNet real–time data
connections to individual modules or module groups. Each
connection is independent of the others and can be from different
processors or scanners.
One 1794-ACN15/B and -ACNR15/B ControlNet adapter can
interface up to eight terminal base units with installed FLEX I/O
modules, forming a FLEX I/O system of up to eight slots. The
adapter communicates to other network system components
(typically one or more controllers or scanners, and/or programming
terminals) over the ControlNet network. The adapter communicates
with its I/O modules over the backplane.
I/O Module
Inputs
Read
Status
Outputs
Write
Configuration
Slot 0
Data is exchanged scheduled (when mapped) or unscheduled (using
CIO instructions).
I/O Module
0
Inputs
Read
Words
Status
Outputs
Write
Words
Configuration
15
Slot 1
4
Chapter
I/O Module
Inputs
Status
Outputs
Configuration
Slot 7