Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 91)

Publication 1756-UM009C-EN-P - December 2010 91
Non-isolated Analog Voltage/Current Input Modules (1756-IF16, 1756-IF8) Chapter 4
1756-IF8 Channel Status Word Bits – Integer Mode
The Channel Status word has the following differences when the 1756-IF16
module is used in integer mode:
• Only Underrange and Overrange conditions are reported by the
module.
• Alarming and Calibration Fault activities are not available, although the
Calibration Fault bit in the Module Fault word activates if a channel is
not properly calibrated.
• There is one, 32-bit Channel Status word for all eight channels.
When the Calibration Fault bit (bit 7) is set in any of the words, the Calibration
Fault bit (bit 9) is set in the Module Fault word. The table lists the conditions
that set each of the words.
Tag (Status
word) Bit Event that sets this tag
ChxUnderrange Odd-numbered bits from
31…1 ( bit 31 represents
channel 17).
For a full listing of the
channels these bits
represent, see on
page 88 .
The underrange bit is set when the input signal at the channel is less than or
equal to the minimum detectable signal.
For more information on the minimum detectable signal for each module, see
page 61. This bit also sets the appropriate bit in the Channel Fault word.
ChxOverrange Even-numbered bits from
30…16 ( bit 30 represents
channel 0).
For a full listing of the
channels these bits
represent, see on page 91.
The overrange bit is set when the input signal at the channel is greater than
or equal to the maximum detectable signal.
For more information on the maximum detectable signal for each module, see
page 61 . This bit also sets the appropriate bit in the Channel Fault word.