User Manual

Appendix E
Publication 1771-6.5.130 Ć May 1999
Differences Between Series A,
Series B, Series C and Series
D Thermocouple/Millivolt
Input Modules
The following is a list of major differences between Series A, Series
B, Series C and Series D Thermocouple/Millivolt Input module (cat.
no. 1771–IXE).
Definition Series A Series B Series C and Series D
Calibration Uses potentiometers for calibration
settings with calibration done at -99 and
+99mV.
Calibration is done automatically using auto-calibration feature, or
manually through programming.
Offset, Gain Calibrations User offset calibration range of +1270uV.
Offset correction of 3.2328 uV/bit.
User gain correction of .012207%/LSB
with a maximum of 1.5503%.
User offset calibration range is +410.5uV maximum. An offset
correction is 3.2328 uV/bit User gain correction is now
.00152588%/LSB for a maximum of +0.193787%.
Real Time Sampling Series A default value was 500ms. The default RTS setting (RTS = 0) makes data available every
50ms.
Cold Junction Calibration
In Series A, BTR word 12 was the cold
junction calibration word.
BTR WORD 12 is the rounded Cold Junction Temperature resolute
to 1 degree C displayable in the programmed format (BCD, 2s
complement or signed magnitude).
Cold Junction calibration done by user. Cold Junction calibration automatically calibrated at power up.
Cold junction temperature is updated
once per 15 second interval.
Cold junction temperature is digitally filtered with a filter time
constant of 12.8 seconds.
Cold junction value is updated continously
High and Low Alarms Limits When a low alarm is programmed greater
than a high alarm, the Series A displayed
only low alarm.
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.
Backplane Current 1200mA at 5V. 750mA at 5V. 850mA at 5V.
Agency Certification
(when product or packaging is
marked)
• CSA certified
• CSA Class I, Division 2, Groups A, B, C, D certified
• UL listed
• CSA certified
• CSA Class I, Division 2, Groups A, B,
C, D certified
• UL listed
• CE marked for all applicable directives
Major Differences between
Series