Rockwell Automation 1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT, -IF4ICFXT, -OF4IXT, IF2XOF2IXT FLEX I/O Isolated Analog Modules - Manual (Page 123)

Publication 1794-6.5.8 - January 2010
Calibrating Your Module 121
Calibrating Your Isolated
Analog Input Module The analog input module is shipped already calibrated for 150Hz,
300Hz and 600Hz. No recalibration is required when switching
between these conversion rates. Recalibration is required when going
to 1200Hz conversion rate. Calibration of the module consists of
applying a voltage or current across each input channel for offset and
gain calibration.
Bits Used During Calibration
Refer to chapter 4 for bit/word descriptions. The following bits are
used during calibration of your module:
IC = initiate configuration. This bit must be set (1) to initiate
calibration
RV = revert to defaults. When this bit is set (1) during a
calibration sequence, default values for the selected channels are
used for the calibration coefficients. This bit normally reset (0).
QK = quick calibration. When this bit is set (1) during a
calibration sequence, the calibration coefficient is stored to all
related configurations for the selected channels. For example, if
a calibration is performed in a voltage mode, QK allows the
calibration coefficient to be stored to all voltage modes. This bit
is normally reset (0).
CK = calibration clock. When this bit is set to 1, calibration
mode starts and calibration coefficients for the selected channels
are accepted. When cleared to 0, the accepted current
calibration coefficients are stored to the selected channels,
applied and calibration mode exited. Monitor status bits DN and
BD of success of calibration.
GO = gain/offset select. When this bit is set to 1, a 0 to 1 to 0
transition pattern of the CK bit causes a gain calibration to be
performed. When this bit is cleared to 0, a 0 to 1 to 0 transition
pattern of the CK bit caused an offset calibration to be
performed.