Spectrum Controls 1769sc-IF8u - Manual (Page 48)

38 Compact IO ™ Universal Input module
cycle occurs once for all enabled channels. If the function remains
enabled, a calibration cycle occurs every five minutes thereafter. The
calibration cycle of each enabled channel is staggered over several module
scan cycles within the five minute period to limit impact on the system
response speed.
See Effects of Autocalibration on Module Update Time.
Note: The configuration file can also be modified through the control
program, if supported by the controller. For information on configuring the
module using RSLogix 500 (with MicroLogix 1500 controller), see
Appendix E; for RSLogix 5000 (CompactLogix controller), see Appendix
F.
The default value of the configuration data is represented by zeros in the
data file. The configuration settings for word 0 are shown below.
Configuration (Word 0)
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CJC Ch7 Ch6 Ch5 Ch4 Ch3 Ch2 Ch1 Ch0
0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1
Unused 0 0 0
0
1
0
1
Cyclic Calibration
Enabled 0
Disabled 1
CJC Sensor
Enabled 0
Disabled 1
Tem p Units
Degrees C
Degrees F
CJC Weighted Profile
Enabled
Disabled
CJC Display
Disabled
Enabled
Temp Units:
This is applied to the appropriate channel as indicated only if the format
selected is Engineering Units X1 or X10. The CJC is only displayed in
Engineering units for (0 through 25 °C) [0 .. 850 °C] or [0 .. 1850 °F].
CJC Weighted Profile
There is only one CJC sensor. If enabled (default), the CJC temperature
for each channel is scaled by multiplying the single CJC reading by a
predefined scale factor derived from lab measurements of each terminal
block pin’s stable temperature. If disabled, the single CJC reading is
applied directly to all channels. If the CJC sensors are installed in a
remote terminal block, the weighted profile must be disabled.