Rockwell Automation 1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT, -IF4ICFXT, -OF4IXT, IF2XOF2IXT FLEX I/O Isolated Analog Modules - Manual (Page 90)

Publication 1794-6.5.8 - January 2010
90 Communication and I/O Image Table Mapping with the DeviceNet/ControlNet Adapter
Word 7 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) Request for hold outputs (Q). – Channel request bits that instruct an output
to hold its output level when EN transitions from 1 to 0 to 1. When EN is 0,
outputs go to a safe state dictated by S1/S0. When EN returns to 1, the
outputs will hold their level until the output data equals the output level. P0–
P3 indicates channels holding. Output read back data shows what level is
being held. Q0 = bit 08 (10) = channel 0; Q1 = bit 08 (10) = channel 1, etc.
Word 7 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.
Words 8 and 9 Bits 00-15
(00-17) Not used.
Table 5.10
Word/Bit Descriptions for the 1794-OF4I Isolated Analog Output Module
Word Decimal Bit
(Octal Bit) Definition