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DATALOGGER
NI400
NI400
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DATALOGGER
NI400
NI400
VIRTUAL CHANNELS
Overview
This chapter is focused on Virtual Channels (VC from now on), to understand why VC are
implemented on NI400 datalogger and how to configure them.
1. Why are Virtual Channels implemented in NI400 Family? – This paragraph shows ben-
efits of Virtual Channels
2. Scripts – Scripts are a fundamental section of Virtual Channels’ architecture.
3. Virtual Channels configuration – “HOW TO” use and configure Virtual Channels’ with
analog and digital sensors, digital input and multiplexers.
4. Common Errors – Here are shown common errors made during virtual channels creation,
and how to avoid them.
Why are Virtual Channels implemented?
We usually use sensors to get a measure. Anyway, we could need a way to modify that
number because we need either a derived measure (airflow/airspeed) or an expression cal-
culated on more than 1 sensor (dewpoint or Δt between two zones for instance). We can
calculate this with spreadsheet or just let our datalogger do the work.
NI400 Family has this feature with Virtual Channels.
Virtual Cannels allows operations to be made on a single channel or between channels.
NI400 group them into Scripts, with a maximum of 5 scripts containing 16 virtual channels
each. Each Virtual Channel can handle up to 9 elements (including Virtual Channel belong-
ing to the same script).
Figure 61
Figure 58
Figure 59
Figure 60
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