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FIGURE 9-5. DIN rail mounting
10. Operation
The TEMP 120 makes thermocouple measurements either under the direction of SURVEYOR or
the data logger.
10.1 SURVEYOR control
SURVEYOR sets up the TEMP 120 to start making measurements, display data, and store that data
to a computer. For more information, see
Measurement quickstart using SURVEYOR
(p. 2).
10.2 Data logger control
Upon compiling the program, the data logger sends information to each TEMP 120 about every
relevant sequence, scan, and measurement. The data logger uses a data sync to initiate
measurements on the TEMP 120. Because measurements can be made in multiple scans, slow
sequences, sub-scans, and subroutines, the data logger firsts sends a message to the modules
indicating which measurements are to be made upon the next data sync.
When the TEMP 120 receives a sync signal, it begins making measurements. The measurement
order on the TEMP 120 follows the sequence of the instructions addressed to it within the current
active scan of the data logger program. After the measurements are completed, it sends the data
to the data logger for processing.
10.3 Measurements
The TEMP 120 is a purpose-built device made to measure thermocouples. Beyond specifying
input channels and thermocouple types, you only need to specify two operational parameters:
temperature units (Celsius, Fahrenheit, or Kelvin) and filtering.
TEMP 120
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