Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual - Manual (Page 119)

Block Transfer Write and Block Transfer Read Configurations for 2 Output/6 Input 1771-N Series Modules E–7
Publication 1771ĆUM127B-EN-P - December 2002
Block Transfer Read Bit/Word Description for 2 Output/6 Input
Modules
Word
Decimal Bit
(Octal Bit)
Definition
Word 0
Bits 00-15
(00-17)
Always = 8800 hexadecimal
Bits 00-05 Not used. Always 0
Bit 06 Bad structure. This bit is set if there is an error in the BTW header.
Bit 07
Bad program. This bit is set if any of the module level programming
data is illegal.
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.
Word 1
Bits 09-10
(11-12)
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.
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 02-14
(02-16)
Not used. Always 0.
Bit 15 (17) Always 1.
Word 3
Bits 00-15
(00-17)
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.)
Bit 00-03 Not used. Always 0.
Word 4
Bit 04
Low clamp. This bit is set if alarms are enabled and the output data is
lower than the low clamp value.
Bit 05
High clamp. This bit is set if alarms are enabled and the output data is
higher than the high clamp value