Rockwell Automation 1771-IR Series D RTD Input Module User Manual - Manual (Page 69)

Appendix
F
Publication 1771Ć6.5.129 - March 2000
Differences Between Series A
RTD Modules and Series B. C
and D RTD Input Modules
The following is a list of major changes from Series A to Series B, C
and D RTD Input Module (cat. no. 1771–IR).
•
The customer applied “10 ohm resistance value @ 0 o C” is
now “10 ohm resistance value @ 25 o C” with a range of 9.00 to
11.00 ohms.
•
Calibration is now done automatically using the auto–calibration
feature, or manually through programming.
•
Auto–calibration is done at 1.00 ohm and 402.0 ohms. Manual
software calibration is done at 1.00 and 402.00 ohms (not 18.83
and 375.61 ohms). The module should be configured for platinum
ohms display, not temperature, during the calibration procedure.
•
If EEPROM read of the auto–calibration values fails, BTR
WORD 1 bit 7 is asserted.
•
RTS can be reduced to 100ms by programming RTS = 1.
•
The default RTS setting at power up is inhibited and data is
available every 50ms for Series B (was 300ms for Series A).
•
Backplane power is approximately 0.85A at 5V. Series A was
1.0A at 5V.
•
Accuracy specifications over RANGE and TEMPERATURE are:
Typical
Copper = + 4.91
o C
Platinum = + 2.60 o C
OHM = + 0.82 Ohms
•
User offset calibration range is +1.29 ohms maximum. Series A
was +3.81 ohms. Offset correction is 10.2mohms/bit. User gain
correction is now 0.00152588%/LSB for a maximum of
+0.193787%.
•
Multiple BTRs may occur before configuration of the module.
Major Differences between
Series