Rockwell Automation 1771-IL Installation Instructions - Manual (Page 9)

Isolated Analog Input Module 9
Publication 1771Ć5.62 - November 1998
Use the following table to read data from your input module.
Dec. Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Description
Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Description
Word 1 Not Used A HF IA IF RTS IS OR PU Diagnostics
Alarm violation status bit - (A) This bit is set if one or
more channels are in an alarm condition.
Hardware fault - (HF) When this bit is set, the dc/dc converter
fuse has blown. Digital logic will continue to operate.
Invalid alarm bit - (IA) This bit is set if any alarm value is unusable,
such as expecting BCD and value is in 2's complement binary.
Invalid filter bit - (IF) This bit is set if the filter parameters are not correct.
The value must be between 00 and 99 (0.00 and 0.99 seconds) in BCD, or
between 0 and 255 (0 to 2.55) in binary.
Real time sample fault bit - (RTS) This bit is set if the module is configured for
RTS and a block transfer read has not occurred within the user-programmed period.
Power up bit - (PU) Used by the module to tell the
processor that it is alive but not yet configured. It is
a key element in the application program.
Out of range bit - (OR) This bit is sent to tell the
processor that one or more channels are either
over or under range.
Invalid scaling bit - (IS) This bit reports that the scaling
is somehow invalid. Usually, both values are equal or
minimum is greater than maximum when this bit comes
on. Can also be an invalid filter value.
Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Description
2 Not Used 8 7 6 5 4 3 2 1 Data underrange for channels 1-8
3 Not Used 8 7 6 5 4 3 2 1 Data overrange for channels 1-8
Underrange bits for each channel. Bit 00 for channel 1, bit 01 for channel
2, etc. These bits are set (1) at approximately the input range limits shown
on the right.
Overrange bits for each channel. Bit 00 for channel 1, bit 01 for channel
2, etc. These bits are set (1) at approximately the input range limits shown
on the right.
1 to 5V dc, 4 to 20mA (default)
0 to 5V dc, 0 to 20mA
Ć5 to +5V dc, Ć20 to +20mA
Ć10 to +10V dc, 0 to 10V dc
4 Not Used 8 7 6 5 4 3 2 1
Data polarity for channels 1 8
Polarity bits - Set when input is less than zero.
Data polarity for channels 1-8
5 Channel 1 Input Channel 1 Input
6 Channel 2 Input Channel 2 Input
⇓ ⇓ ⇓ ⇓
12 Channel 8 Input Channel 8 Input
13 Not Used 8 7 6 5 4 3 2 1 Low Alarm Bits
14 Not Used 8 7 6 5 4 3 2 1 High Alarm Bits
Low Alarm bits for channels 1 through 8 respectively. Each bit represents
an alarm indicator for that channel. When the bit is set, the value of that
channel is below the low alarm value.
High Alarm bits for channels 1 through 8 respectively. Each bit represents an
alarm indicator for that channel. When the bit is set, the value of that channel is
above the high alarm value.
15 8 7 6 5 4 3 2 1 CF EF Not Used S G O Calibration Status Bits
Calibration Fault - (CF) When this bit is set, the module could
not perform offset or gain calibration. This bit is set when a save
is requested.
EEPROM Fault - (EF) When this bit is set, the calibration values
could not be saved to EEPROM.
Offset Calibration Complete - (O) When
this bit is set, the offset calibration request
was successfully completed.
Gain Calibration Complete - (G) When
this bit is set, the gain calibration request
was successfully completed.
Save Complete - (S) When this bit is
set, the save calibration values to
EEPROM" was successfully completed.
Calibration Inhibited. Bits 8 (10) through 15 (17) represent a
channel that was not calibrated, either due to an error or a user
request. If the channel was requested not to be calibrated, these
bits confirm that request.