Rockwell Automation 1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT, -IF4ICFXT, -OF4IXT, IF2XOF2IXT FLEX I/O Isolated Analog Modules - Manual (Page 84)

Publication 1794-6.5.8 - January 2010
84 Communication and I/O Image Table Mapping with the DeviceNet/ControlNet Adapter
Word 3 Channels 0 through 3 Filter Selections (refer to Table 5.5)
Bits 00-03 Channel 0 Configuration
Bits 04-07 Channel 1 Configuration
Bits 08-11
(10-13) Channel 2 Configuration
Bits 12-15
(14-17) Channel 3 Configuration
Word 4 Bits 00-14
(00-16) Real Time Sample Interval – Programs the interval of the real time sample.
Can be varied from 0 to 30 seconds (30000 decimal). Resolution is in ms with
granularity in 5ms steps.
Bit 15 (17) Not used. Set to 0.
Word 5 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.
Bits 08-11
(10-14) Not used. Set to 0.
For IF4ICFXT only:
Bit 8 — FastStepResponse (FR) forces the A/D to skip the FIR stage if an
input step occurs. An averaging algorithm is temporarily used instead of the
FIR filter in the A/D to provide a quicker response.
Bit 9 — FIRFilterDisable (SK) bypasses the FIR filter stage in the A/D.
Bit 10 — ChopModeDisable (CH) disables the chop mode in the A/D. Chop
mode is used to reduce offsets between input and output of the analog
section of the A/D.
(1)
Note: Module level settings that only affect 150 Hz, 300 Hz, and 600 Hz
conversion rate settings.
Table 5.6
Word/Bit Descriptions for the 1794-IF4I Isolated Analog Input Module
Word Decimal Bit
(Octal Bit) Definition