Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 147)

Publication 1756-UM009C-EN-P - December 2010 147
Temperature-measuring Analog Modules (1756-IR6I, 1756-IT6I, and 1756-IT6I2) Chapter 6
Channel Status Word Bits – Integer Mode
The Channel Status word has the following differences when 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 will activate if a channel
is not properly calibrated.
• There is only one Channel Status word for all six 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.
Channel Status Word Conditions
Tag (Status
word) Bit Event that sets this tag
ChxUnderrange Odd-numbered bits from bit
15…bit 5 (bit 15 represents
channel 0).
For a full listing of the
channels these bits
represent, see
page 145 .
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 123 . This bit also sets the appropriate bit in the Channel Fault word.
ChxOverrange Even-numbered bits from
bit 14…bit 4 (bit 14
represents channel 0).
For a full listing of the
channels these bits
represent, see
page 145 .
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 123 . This bit also sets the appropriate bit in the Channel Fault word.