Rockwell Automation 1746-NT4 Series B,D17466.6.1 SLC 500 4-Channel Thermocouple/mV Input Module User Manual - Manual (Page 77)

Publication 1746-UM007C-EN-P - July 2004
Ladder Programming Examples 6-7
Invoking Autocalibration Autocalibration of a channel occurs whenever a channel is enabled, or
when a change is made to its input type or filter frequency. You can
also command your module to perform an autocalibration cycle by
disabling a channel, waiting for the status bit to change state (1 to 0)
and then re-enabling that channel. Several channel cycles are required
to perform an autocalibration
To maintain system accuracy we recommend that you periodically
perform an autocalibration cycle, for example:
•
whenever an event occurs that greatly changes the internal
temperature of the control cabinet, such as opening or closing
its door
•
at a convenient time when the system is not making product,
such as during a shift change
Several channel cycles are required to perform an autocalibration, and
it is important to remember that during autocalibration the module is
not converting input data.
IMPORTANT
During autocalibration the module is not converting
input data.