Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual - Manual (Page 169)

Block Transfer Write and Block Transfer Read Configurations for 5 Output/3 Input 1771-N Series Modules J–7
Publication 1771ĆUM127B-EN-P - December 2002
Block Transfer Read Bit/Word Descriptions for 5 Output/3 Input
Modules
Word
Decimal Bit
(Octal Bit)
Definition
Word 0
Bits 00-15
(00-17)
Constant = 8800 hexadecimal
Word 1
Bits 00-05 Not used
Word 1
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.
Word 1
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 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 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.)