Timing of measurements
(Original Document)
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Introduction
The cycle length (time) for the TBX AES 400 module depends on the electricity network frequency (50Hz or 60Hz) and therefore on the rejection mode selected upon configuration.
The measurements are sequenced in the following manner: channel 0, channel 1, channel 2, channel 3 then acquisition of the module’s cold junction temperature.
Breakdown of the cycle time
Illustration of the cycle time
The table below shows the various terms of the calculation.
Type of time
50 Hz rejection
60 Hz rejection
Scanning time for a channel
80 ms
68 ms
Acquisition time for the cold junction temperature
80 ms
68 ms
Acquisition time for a complete cycle
400 ms
340 ms
NOTE:
  • The cycle is always identical, even when some channels are not in use,
  • The time required for the program to access the measurements also depends on the transmission times on the Fipio bus and on the PLC task period.