Rockwell Automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual - Manual (Page 59)

Publication 1794-UM064B-EN-P - May 2014
Communicate With Your Module 47
Write 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 channel 1, bit 02 corresponds to input channel 2, bit 03
corresponds to input channel 3.
Bit 04 Gain/Offset Calibration bit (GO) – When this bit is cleared, a 0...1...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 coefficient 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
successful 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 bits (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…11
(10…14) Not used. Set to 0.
Bit 12 (14) Interrupt Toggle bit (IT) – This bit, when set (1), permits interleaving of module
interrupts ensuing 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 7.5 ms update rate are reduced to 5.0 ms. 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 subsequent
configuration information is ignored until IC is toggled.
Write Words
5…7 Bits 00…15
(00…17) Not used.
1794-IF4I Isolated Analog Input Module Word/Bit Descriptions
Word Decimal Bit
(Octal Bit) Definition