Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual - Manual (Page 64)

5–4 Module Status and Input Data
Publication 1771ĆUM127B-EN-P - December 2002
Definition
Decimal Bit
(Octal Bit)
Word
Bit 08 (10)
Module fault. This bit is set if any of the programming data sent
to the module in the most recent BTW was illegal, or if one or
more channels has the bad calibration bit set.
Bits 09Ć10
(11Ć12)
Program verify. Indicates the result of verify request. 00 = verify
not requested; 10 = verify failed; 11 = verify succeeded
Bit 11 (13)
I/O reset. This bit is set whenever the I/O reset line on the
backplane is asserted.
Word 1 continued
Bit 12 (14)
RTS timeout. This bit is set if a BTR was not requested of the
module within the RTS sample time.
Bit 13 (15)
Module alarm. This bit is set if there is an alarm bit set for one
or more channels. The input alarm bits are low, high alarm and
rate alarm. The output channel alarm bits are low and high
clamp, and the rate limit alarm.
Bit 14 (16)
Bad channel data. This bit is set if the module is in BCD mode
and one or more of the input data values sent in the last BTW
are not a legal BCD value.
Bit 15 (17)
Powerup bit. This bit is set until a BTW with programming data
is received by the module.
Bit 00
Cold junction compensation (CJC) underrange bit. This bit is
set if the CJC temperature is below 0 o C.
Word 2
Bit 01
Cold junction compensation (CJC) overrange bit. This bit is set
if the CJC temperature is above 70 o C.
Bits 02Ć14
(02Ć16)
Not used. Always 0
Bit 15 (17) Always = 1
Word 3
Bits 00Ć15
(00Ć17)
Cold junction temperature. Units of 0.01 degrees C or 0.1
degrees F. (0.1 degrees C or 1.0 degrees F in BCD.)
Input Status Data
Each input channel has two words associated with it. One word
provides underrange, overrange, low and high alarms, rate alarm,
bad program and bad calibration information to the processor. The
second word contains channel input data. These words would
immediately follow the header on modules containing only inputs, or
after the output channel words on modules containing both outputs
and inputs.
Word/Dec. Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Word/Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Channel 1 Status
4 1 Unused = 0 Bad
Calib
Bad
Prog
0 Rate
Alarm
High
Alarm
Low
Alarm
Unused = 0 Over
Range
Under
Range
5 Channel 1 Input Data