Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual User Manual
Page 65
5–5
Module Status and Input Data
Publication 1771ĆUM127B-EN-P - December 2002
The above two words would be repeated for each input channel. For
example, if this module had two input channels, the following words
would be used.
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
Channel 2 Status
6
1
Unused = 0
Bad
Calib
Bad
Prog
0
Rate
Alarm
High
Alarm
Low
Alarm
Unused = 0 Over
Range
Under
Range
7
Channel 2 Input Data
Bit/word descriptions for the input status data words are shown
below.
Bit/Word Description for Input Status Data Words
Word
Decimal Bit
(Octal Bit)
Definition
Bit 00
Underrange bit. This bit is set if the input signal is below the
input channels minimum range.
Bit 01
Overrange bit. This bit is set if the input signal is above the
input channels maximum range.
Bits 02-03
Not used. Always 0
Word 4
Bit 04
Low alarm. This bit is set if alarms are enabled and the input
data is lower than the low alarm setpoint.
Bit 05
High alarm. This bit is set if alarms are enabled and the input
data is higher than the high alarm setpoint.
Bit 06
Rate alarm. This bit is set if the input signal changed at a rate
faster than the input rate alarm setpoint.
Bit 07
Not used. Always 0
Bit 08 (10)
Bad program. This bit is set if any of the channel level
programming data is illegal.
Bit 09 (11)
Bad calibration. This bit is set if the channel has not had a valid
calibration.
Bits 10Ć14
(12Ć16)
Not used. Always 0
Bit 15 (17)
Not used. Always = 1
Word 5
Bits 00Ć15
(00Ć17)
Channel 1 input data.