Rockwell Automation 1756-OF8H ControlLogix HART Analog I/O Modules - Manual (Page 83)

Rockwell Automation Publication 1756-UM533C-EN-P - February 2011 83
1756-OF8H HART Analog Output Module Chapter 6
Data Echo
Data Echo automatically multicasts channel data values that match the analog
value that was applied to the module’s screw terminals at that time.
Fault and status data are also sent. If selected in the Input Data format, HART
secondary process variables and device health are also sent.
An example is that I.ChxData is the echo of O.ChxData. They might be different
due to Ramp, Clamp, or Hold for Initialization.
The echo value is the current level being attempted. If the wire is off or damaged,
the actual current might be 0.
Wire the Module Use Figure 17 to wire the module. Voltage outputs use the terminal block pins
labelled VOUT-# and RTN. Current outputs use the terminal block pins labelled
IOUT-# and RTN.
HART communication is active with current outputs only.
Figure 17 - Wiring Diagram for the 1756-OF8H Module
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