Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 373)

Publication 1756-UM009C-EN-P - December 2010 373
Additional Specification Information Appendix E
Thermocouple Resolution Thermocouple resolution indicates the degrees that an application
temperature must change before the ControlLogix thermocouple module
reports a change. Resolution varies depending on the these factors.
• Input range used, either:
– -12…30 mV
– -12…78 mV
• Thermocouple type, any of the following:
– B, R, S, E, J, K, N, T, L and D (L and D are used on the
1756-IT6I2 module only)
• Application temperature that is, the temperature of the physical location
where the thermocouple is being used)
EXAMPLE
For example, when the 1756-IT6I module is operating in the
following conditions:
• -12…30 mV input range
• connected to a type K thermocouple
• application temperature of 400 °C (752 °F)
the resolution is 0.017 degrees.
In other words, the application temperature must change by
0.017 degrees or greater for the 1756-IT6I module to record a
change. If the temperature stays in a range from
399.984…400.0169 °C (751.971…752.030 °F), the module will
continue to report an application temperature
of 400 °C (752 °F).