Rockwell Automation 1771-IXE Thermo/MV Input Installation Instructions - Manual (Page 8)

Thermocouple/Millivolt Input Module 8
Publication 1771Ć5.49 - October 1996
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
OctalBits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Description
Word 1
Polarity Bits EE 0 CJ
TH
CJ
TL
0 RTS OR PU Diagnostics
EEPROM status bit - (EE) This bit is set if an error
occurs saving calibration data to nonvolatile memory. If
this bit is set at powerup, the data from the EEPROM did
not pass the checksum and no calibration values are
used.
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.
Polarity bits set to indicate negative polarity: bit 10 for
channel 1 thru bit 17 for channel 8. These bits are used in
BCD and signed magnitude data formats.
Realtime sample time-out bit is set when the
module updates an input buffer with new data before
the processor has read the previous data. Monitor this
bit only if you select real time sampling.
Low cold junction temperature bit is set when
the cold junction temperature is less than 0 o C.
High cold junction temperature bit is set when the
cold junction temperature exceeds 60 o C.
2
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.
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.
Data underrange and overrange bits
3
High alarm bit for each channel is set to
indicate the input has exceeded the high
limit value you entered in the
corresponding high alarm word (word 5,
7, 9, 11, 13, 15, 17, or 19): bit 10 for
channel 1 thru bit 17 for channel 8.
Low alarm bit for each channel is set to
indicate the input is less than the low limit
value you entered in the corresponding low
alarm word (word 4, 6, 8, 10, 12, 14, 16, or
18): bit 00 for channel 1 thru bit 07 for channel
8.
Low and high alarm bits
4, 5, 6, 7, 8,
9, 10, 11
Input for channel 1 through 8 respectively.
12 Cold Junction Temperature in o C
13 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 AutoĆCalibration Word
Calibration saved to EEPROM if bit is set
Offset calaibration complete when bit is set
Gain calibration complete when bit is set.
EEPROM fault is bit is set.
Calibration fault when bit is set.
Uncalibrated channel bits - channel not
calibrated if bit is set. Bit 10 corresponds to
channel 1, bit 11 corresponds to channel 2, etc.
For detailed configuration information,
see your Thermocouple/mV Input
Module User Manual (publication
1771Ć6.5.77).