Rockwell Automation 1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT, -IF4ICFXT, -OF4IXT, IF2XOF2IXT FLEX I/O Isolated Analog Modules - Manual (Page 127)

Publication 1794-6.5.8 - January 2010
Calibrating Your Module 125
Calibrating Your Isolated
Analog Output Module Calibration of the module consists of measuring a voltage or current
across each output, and calculating an offset or gain correction value.
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.
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.
IMPORTANT
Voltage calibration requires offset calibration
followed by gain calibration. Current calibration
requires gain calibration followed by offset
calibration, and then a limited gain calibration using
corrected coefficients.