Manual
ibaBM-DP
74
Issue 1.7
10.3.2.2 "Analog" tab
Fig. 43: "Sniffer" module – "Analog" tab
Enter the analog signals you want to record in sequential order. The individual columns
in the signal list have the following meaning:
Name
Here, you can enter a signal name and additionally two comments, if you click on
the icon on the signal name field.
Unit
Here, you can enter the physical unit of the analog value
Gain / Offset
Gradient (Gain) and y axis intercept (Offset) of a linear equation. You can convert a
normalized value transferred without a unit into a physical value.
Example
: For a SIMATIC ET200 AI/AO module, a +/-10V signal with a value range
of -27648 … 27648 (equals -10V … +10V) is transferred. Within the PLC program,
the transferred value has a physical meaning (e. g. temperature 50°C … 500°C).
You can choose by Gain/Offset a conversion of the value. The value which has
been acquired without a unit is then recorded with the physical unit.
For making the calculation of Gain/Offset easier, an auxiliary dialog appears when
clicking on the co-ordinate cross icon in the "Gain" or "Offset" field. In this dialog,
you only enter two points in the line equation. Gain and offset are then calculated
automatically.
