Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 50)

50 Rockwell Automation Publication 1715-UM001C-EN-P - March 2014
Chapter 2 Installation Instructions
Analog Output Termination Assemblies
Analog output termination assemblies support these features:
• Eight output channels for a simplex/duplex configuration
• Industry-standard field device connections at the terminal blocks
• Analog output channels provide 4…20 mA DC for external field devices
• Duplex termination assembly provides increased fault tolerance for output
channels
There are two types of analog output termination assemblies:
• A 1715-TASOF8, 8-channel simplex TA that provides termination for 8
single-ended analog output channels and mates with a single 1715-OF8I 8
-channel analog output module
• A 1715-TADOF8, 8-channel duplex termination assembly provides fault
tolerant operation for 8 analog output channels through inter-module
communication and by routing the output source current from two
modules to the same field device
IMPORTANT The dual termination assembly does this by supporting inter-module
communication for current sync operation and by routing the channel outputs
from two 8-channel analog output modules in parallel to 8 field device.
Therefore, each field device receives a current source from a channel on each of
two modules. So if one module fails, or one or more channels fail on a module,
the outputs from the second module continues to supply the field devices.