Rockwell Automation 1771-IXE/D Thermocouple/Millivolt Input Module User Manual User Manual
Page 73
Differences Between Series A, Series B, Series C and Series D Thermocouple/Millivolt
E–3
Publication1771-6.5.130 Ć May 1999
•
Accuracy specifications over typical RANGES and
TEMPERATURES are:
Input Type
Range IS
Range WAS
Accuracy IS
E
-270 to 1000
o
C
-200 to 1000
o
C
E = + 2.14
o
C
J
-210 to 1200
o
C
-200 to 1200
o
C
J = +2.26
o
C
K
-270 to 1380
o
C
-200 to 1372
o
C
K = +3.01
o
C
R
-50 to 1780
o
C
- 50 to 1768
o
C
R = +4.70
o
C
S
-50 to 1780
o
C
- 50 to 1768
o
C
S = +4.74
o
C
T
-270 to 400
o
C
-200 to 400
o
C
T = +1.41
o
C
mV
+100.00
+100.00
mV = +144uV
NOTE: Measurements of the most negative temperature extremes
are less accurate, as the Seebeck coefficient of the thermocouple
drops below the input resolution of the module, 3.2328uV/bit.
Above specifications are valid to ?degrees on thermocouple types ?
and ?.
•
User offset calibration range is +410.5uV maximum. Series A
was +1270uV. An offset correction is 3.2328 uV/bit not
10uV/bit. User gain correction is now .00152588%/LSB for a
maximum of +0.193787%. Series A was .012207%/LSB with a
maximum of 1.5503%.
•
Multiple BTRs may occur before configuration of the module.
•
A block transfer read request with a word length of 00 will
return with the old Series A block transfer default length (27 for a
write; 12 for a read). To access the auto calibration word, the
block transfer length must be set to 28 for a write and 13 for a
read.
•
Auto calibration can be performed on all channels
simultaneously or on only certain channels of interest. In either
case, channels being calibrated must be connected to the
precision voltage source. Input impedance > 10
Megohms/channel.
•
When a low alarm is programmed greater than a high alarm both
low and high alarms will be activated when the input is between
the two values. The Series A displayed only low alarm.
•
An invalid alarm entry (only 0–9 BCD accepted) will cause the
alarm value to be set equal to zero.
•
In mV mode when displaying in 2’s complement or signed
magnitude format, the module will continue to display readings
past the over or under range limit until the input saturates.
•
The module employs a digital filter capable of 120dB/decade
rolloff from a corner frequency of 8 Hz.
•
This Series B module is NOT compatible with the 1771–EX
extender board. Use the 1771–EZ extender board with Series B.