Manual for installation of the Sensformer® Connectivity Device
© 2020 Siemens Energy Page 15
3.1. Analog sensors
Analog channel parameters, like gain, offset, unit and type can be
set on the “Settings” sheet of the graphical user interface (GUI).
Figure 15- Analog sensors
Measured values are calculated according the following formula:
value = Ax + B
where x is the measured value by the device, A is the gain and B
is the offset.
The “Unit” specifies the physical unit of the converted value. The
setting “Type” defines the operation mode of the analog input
channels: AC input with +-20mA or DC input with 4-20mA range.
The operation mode can be set for each channel individually.
3.2. Digital sensors
The digital threshold value sets the limit of the logical “1”
between 48-240VDC and 48-240VAC. The AC and DC modes can
be changed and the threshold value can be set for the two digital
channels individually. The threshold value is equal to the input
voltage border: if the input voltage smaller than the threshold,
the digital input value is “0”, otherwise it is “1”.
Figure 16 - Digital sensors section of web GUI
A voltage divider and an optocoupler are used to convert the
incoming voltage to a measurable scale. The input voltage
converted by a 12bit A/D converter.
In DC mode, the Sensformer Connectivity Device can measure
and count the high level impulses, if the impulse width less than
200ms and more than 5ms. If the impulse width is greater than
200ms, then the impulse width will be “0”, but the level value will
be “1”.
The device will show the shortest of several impulses of different
width, but will count all of them, for example:
Figure 17 - Pulse(s) on the digital inputs I.
In this case, the impulse count value will be “2”, the impulse width
will be “30”, and the digital value will be “0”.
The impulse width measure is working only with the high level
impulses! If the signal default value is high, and the impulse level
is low, the impulse measure is not working! For example:
Figure 18 - Pulse(s) on the digital inputs II.
In this case, the digital value will be “1”, the pulse width will be
“0”, and the pulse count also will be “0”.
But, for example:
Figure 19 - Pulse(s) on the digital inputs III.
In this case, the digital value will be “1”, the pulse count will be
“1”, and the pulse width will be “45”.
In DC mode, the sampling time is 1ms.
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