Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 16)

16 Rockwell Automation Publication 1715-UM001C-EN-P - March 2014
Chapter 1 Redundancy System Overview
1715 I/O Modules
Both digital and analog I/O modules are available for use in this system,
depending on your needs. I/O modules can be used singly or in pairs, providing
configuration in either Simplex or Duplex modes.
These are the 1715 modules that can be used in this system.
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 using a SIL 2 safety applications, see Chapter 6 and Chapter 7 .
System Architecture 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 additional 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.
Table 2 - Modules Available for the 1715 Redundant I/O System
Cat. No. Description
1715-AENTR x 2 A pair of Ethernet adapter modules
1715-IB16D A 16-channel digital input module
1715-OB8DE An 8-channel digital output module
1715-IF16 A 16-channel analog input module
1715-OF8I An 8-channel analog output module