Rockwell Automation 1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT, -IF4ICFXT, -OF4IXT, IF2XOF2IXT FLEX I/O Isolated Analog Modules - Manual (Page 107)

Publication 1794-6.5.8 - January 2010
Input, Output, Status and Configuration Files for Analog Modules when used with ControlNet 107
Word 4 Bit 00-03 Channel calibration selection bit. When this bit is set (1), the channel can be
calibrated using the calibration clock bit (CK). Bit 00 corresponds to input channel 0, bit
01 corresponds to input channel 1, it 02 corresponds to input channel 2, bit 03
corresponds to input channel 3
Bit 04 Gain/Offset selection bit (GO). – When this bit is cleared, a 0 to 1 to 0 transition of
the CK bit performs on offset calibration. When this bit is 1, the module is directed to
do a gain calibration.
Bit 05 Calibration clock bit (CK). – When this bit is set to 1 (calibration mode), the
calibration coeffiicient for the selected channels is accepted. When this bit is reset (0),
the accepted calibration coefficients for the selected channels are stored, applied, and
the calibration mode exited. Monitor status bits DN and BD for succesful calibration.
Bit 06 Quick Calibration bit (QK). – Normally reset (0). When this bit is set (1) during a
calibration sequence, the calibration coefficient is stored to all related configurations
for the selected channels. NOTE: This method of calibration quickly calibrates the
selected channels, however you will not be within the rated accuracy of the module.
Bit 07 Revert to defaults bit (RV). – Normally reset (0). When set (1) during a calibration
procedure, default values for selected channels are used for the calibration
coefficient.NOTE: You will not be within the rated accuracy of the module.
Bit 08 1794-IF4I - Not used. Set to 0.
1794-IF4ICFXT -
Fast Step Response (FS). - Use to enable a fast step response algorithm. The fast
step response algorithm, upon sensing a step input, uses an averaging method rather
than the FIR filter. The FIR goes back into operation once the input has settled. The
default is fast step response disabled (0).
Bit 09 1794-IF4I - Not used. Set to 0.
1794-IF4ICFXT -
FIR Filter Disable (SK). - Use to disable the FIR filter. The Finite Impulse Response
filter is used by the module to improve signal stability. The default is FIR filter enabled
(0).
Bit 10 1794-IF4I - Not used. Set to 0.
1794-IF4ICFXT -
Chop Mode Disable (CH). -Use to disable the chop mode. Chop mode used by the
module to reduce offset and drift errors. The default is chop mode enabled (0).
Bit 11 Not used. Set to 0.
Bit 12 (14) Interrupt Toggle bit (IT) – This bit, when set (1), permits interleaving of module
interrupts ensuring exchange of critical data when channels are configured for their
fastest update times. RTSI and “no low pass filter” must be 0 in order for the module to
recognize this feature. This groups data update rates for all channels to the slowest
configuration setting of any of the channels. In addition, channel update rates for all
channels with a 7.5ms update rate are reduced to 5.0ms. When reset (0), real time
sampling and filter features are enabled.
Bit 13 (15) Transparent bit (TR). – This bit, when set to 1, permits configuration to be changed
without using the IC bit.
Bit 14 (16) Set to 1.
Bit 15 (17) Initiate Configuration bit (IC). – When set (1), instructs the module to enter
configuration mode. Present configuration data prior to or coincident with IC being set.
Once IC returns to 0, the configuration is applied and any subquent configuration
information is ignored until IC is toggled.
Table 6.3
Word/Bit Descriptions for Isolated Analog Input Module
Word Decimal Bit
(Octal Bit) Definition