UMAXTC20CO V1.1.1 Preliminary Documentation – May be Subject to Change 10-59
1.4.
Cold Junction Measurements
Figure 3 – Cold Junction Measurement Block Diagram
The cold junction value is measured from an on-board temperature sensor and used in the
thermocouple temperature calculations. By default, the value measured can be broadcasted on
TPDO2.
The measured cold junction temperature is written to read-only object $3100
Cold Junction Input
Field Value
in degrees Celsius. As with the thermocouple inputs, the average FV can be
converted to a process value using scaling objects $3126
Cold Junction Scaling Factor
and
$3127
Cold Junction Scaling Offset
. The formula to convert to read-only object $3130
Cold
Junction Input Process Value
is the same as describe in section 1.2.
The supply voltage powering the scanner is written to read-only object $5000
Power Supply
Measured
, which can be mapped to a TPDO object, but by default it is not.
