Emerson AMS Trex User Manual page 178

Fieldbus Diagnostics application
signal measurements are organized by valid fieldbus address (16 -255), one column for
each address. The value in each column is the measurement value in mV (peak-to-peak).
Scroll to the right to see all columns in the log file.
Figure 5-10:
Measurement intervals
The Target Update Rate you set when you enable logging determines how many seconds
occur between the sets of measurements, up to the maximum number of log entries you
specify. The default is to take a DC voltage, noise, and signal measurement every 10
seconds up to 1,000 times. After 1,000 sets of measurements, the Fieldbus Diagnostics
application turns off logging and stops saving measurements.
The measurements may be taken more frequently than the number you set for the Target
Update Rate. If the Fieldbus Diagnostics application detects a device was added/removed
or it detects a bad DC voltage, the application captures an extra measurement "row" in the
log file to show the drop in voltage. The application attempts to take more data to help
you troubleshoot and determine the cause of the readings.
Note
The actual update rate may be affected by conditions on the fieldbus network. For example, if the
fieldbus network has a lot of scheduled activity, the rotation of the network token will be slow, and
the Trex unit will to wait longer to measure each device's signal.
Viewing the saved measurements on a PC
To view the saved measurements, you need use the File Transfer Utility to transfer the log
file from the Trex unit to a PC. You cannot view the log files on the Trex unit. The File
Transfer Utility is included with the install of Upgrade Studio. (You can access the Upgrade
Studio installer on the resource DVD/media included with the Trex unit.)
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Example log file
User Guide