Rockwell Automation 1762-IR4 RTD/Resistance Input Module - Manual (Page 54)

Publication 1762-UM003A-EN-P - February 2003
3-20 Module Data, Status, and Channel Configuration
Selecting Enable/Disable Cyclic Autocalibration (Word 4, Bit 0)
Configuration word 4, bit 0 allows you to configure the module to
perform an autocalibration cycle of all enabled channels once every 5
minutes. Cyclic calibration functions to reduce offset and gain drift
errors due to temperature changes within the module. Setting this bit
to 1 disables cyclic calibration, the default (0) enables the
autocalibration function. See Effects of Autocalibration on Accuracy
on page 3-33.
Determining Effective
Resolution and Range This section provides tables showing effective resolution and range
for all possible input data types at each filter frequency. Look up your
required resolution, range, and input type in the tables. Choose the
frequency that most closely matches your requirements.
TIP
For systems that allow modifying the state of this bit,
you can program the autocalibration cycle to occur
whenever you desire via the ladder program, by
cycling the bit from 0 to 1.