1715 I/O Modules In Sil 2 Applications; System Architecture; Termination Assemblies; Base Unit Structure - Rockwell Automation Allen-Bradley 1715-AENTR User Manual

Chapter 1 Redundancy System Overview

System Architecture

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Table 1 lists the 1715 modules that can be used in this system.
.
Table 1 - Modules Available for the 1715 Redundant I/O System
Cat. No.
1715-AENTR x 2
1715-IB16D
1715-OB8DE
1715-IF16
1715-OF8I

1715 I/O Modules in SIL 2 Applications

With the inclusion of diagnostics for the CIP messaging channel, the 1715
Redundant I/O system can be used for SIL 2 safety applications. For
information about SIL 2 safety applications, see
The 1715 Redundant I/O System operates with a pair of 1715-AENTR adapters.
When designing your control system by using the 1715 Redundant I/O System,
you can use digital and analog I/O modules in one of these ways:
• One I/O module in Simplex mode
• One I/O module with the option to add a second module
• A pair of I/O modules that work in Duplex mode
You must decide the layout of your I/O before building your system, but you
can add more I/O at any time.
The use of termination assemblies communicates the I/O mode of operation
you choose (Simplex or Duplex) to your system through the backplane (the
adapter and I/O base units).

Termination Assemblies

The termination assembly (TA) matches your software configuration for
simplex or duplex. Attached to an I/O base, the TA can start in any slot and can
span multiple connected bases. When modules are used in Duplex mode, one
module can be absent and the system still runs.

Base Unit Structure

The adapter base unit is always the leftmost base unit in the connection chain.
The total length of the base unit connection chain, including all expansion
cables cannot exceed 10 m (32.81 ft).
An adapter always occupies slot 0 or 1.
An adapter base unit can support up to 8 I/O base units (up to 24 I/O modules).
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Description
A pair of Ethernet adapters
A 16-channel digital input module
An 8-channel digital output module
A 16-channel analog input module
An 8-channel analog output module
Chapter 7 and Chapter 8.