Bit/Word Descriptions For The Thermocouple/Rtd Input Module (1794-Irt8) Block Transfer Read Words - Allen-Bradley 1794-IRT8 User Manual

4-4 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Decimal 15 14
Octal 17 16
8 Overrange Alarm Bits (channel 0 = bit 08, etc)
9 Flt Alm Flt Alm
Ch7 Ch6
10 Resp
Flg
Word
Read Word 0
Read Word 1
Read Word 2
Read Word 3
Read Word 4
Read Word 5
Read Word 6
Read Word 7
Read Word 8
Read Word 9
Read Word 10
Allen-Bradley PLCs
Publication 1794-6.5.12 - November 1997
13 12 11
15 14 13
Flt Alm Flt Alm Flt Alm Flt Alm
Ch5 Ch4 Ch3
EDT command response
Bit/Word Descriptions for the Thermocouple/RTD Input Module
(1794-IRT8) Block Transfer Read Words
Dec. Bits
(Octal Bits)
00-15 (00-17) Channel 0 Input data
00-15 (00-17) Channel 1 Input data
00-15 (00-17) Channel 2 Input data
00-15 (00-17) Channel 3 Input data
00-15 (00-17) Channel 4 Input data
00-15 (00-17) Channel 5 Input data
00-15 (00-17) Channel 6 Input data
00-15 (00-17) Channel 7 Input data
00-07 Underrange bits – these bits are set if the input signal is below the input channel's minimum range.
Bit 00 corresponds to channel 0, bit 01 corresponds to channel 1, etc.
08-15 (10-17) Overrange bits – these bits are set if 1), the input signal is above the input channel's maximum
range, or 2), an open detector is detected. Bit 08 (10) corresponds to channel 0, bit 09 (11)
corresponds to channel 1, etc.
00-03 Diagnostic bits – represent module configuration and/or hardware errors.
Bit 03
0
0
0001 and 0011 thru 1111 Reserved for factory use
04 Not used.
05-06 Cold junction compensation alarm bits – These bits are set (1) when the corresponding cold
junction compensator lead is broken, unattached or shorted. Bit 05 corresponds to CJC1, and bit 06
to CJC2.
07 Not used
08-15 (10-17) Fault alarm bits – An alarm bit is set (1) when an individual input lead opens (broken,
disconnected). If the alarm is enabled, the channel reads maximum value. Bit 08 (10) corresponds to
input channel 0, bit 09 (11) to channel 1, etc.
00-07 Extended data table command response data bits – These bits echo the EDT command data
written to the module during calibration.
08-14 (10-16) Extended data table command response bits – These bits echo the EDT command written to the
module during calibration.
15 (17) Reserved for factory use
10 09 08 07
12 11 10 07
Underrange Alarm Bits (channel 0 = bit 00, etc)
Flt Alm Flt Alm
Rsvd
Ch2 Ch1 Ch0
02 01 00
0 0 0 Reserved for factory use
0 1 0 Improper module configuration
06 05 04
06 05 04
CJC 2 CJC 1
Rsvd
Alm Alm
EDT response data
Description
03 02 01 00
03 02 01 00
Diagnostic Status