Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules User Manual

Page 66

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Publication 1756-UM0009C-EN-P - December 2010

Chapter 4 Non-isolated Analog Voltage/Current Input Modules (1756-IF16, 1756-IF8)

Differential Current
Applications

• Input data for that channel changes to the scaled value

associated with the overrange signal value of the selected
operational range in floating point mode (minimum possible
scaled value) or -32,768 counts in integer mode.

• The ChxUnderrange (x=channel number) tag is set to 1.

In current applications, wire-off detection occurs for one of the
following reasons:

• Because the RTB has been disconnected from the module.
• Both the signal wire and the jumper wire have been

disconnected.

The module reacts with the same conditions as described in
differential voltage applications.

(1)

For more information about tags in the tag editor, see

Appendix B

.

Wire-Off Conditions

When the Wire-Off
condition occurs

These events occur

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