4.1.5 Connecting and configuring analog inputs
4.1.5.1 Overview
SOMANET Servo drives utilize differential and single-ended analog inputs for measuring a wide range of
sensors without adding extra components. Analog sensors can be used for measuring temperature, pressure
and torque, both as voltage and resistance depending on their configuration in the firmware.
With an attached voltage division circuit (which is already integrated in SOMANET Circulo) and a polynomial
function in the software, the drive carries out all calculations. The calculated temperature, pressure or torque
value will be submitted to the master by SDO/PDO for protection or display.
The sensor configuration depends on the used type of sensor as described in this section.
4.1.5.2 How to measure an analog input voltage
SOMANET Servo drives have different inputs to measure analog values. They are connected to an integrated
ADC (Analog to Digital converter) with 12-bit resolution (0-4095 ticks).
Please refer to the hardware manuals for the Analog In specifications for SOMANET Circulo and SOMANET
Node.
Analog inputs must be used (Single-Ended or Differential) for measuring analog sensors or any kind of analog
voltage.
Analog sensors provide a resistance, current or voltage value and are available for pressure, temperature,
torque and many other applications.
For a basic understanding of the analog inputs and signal connection concepts the terms V , V and V
need to be explained.
diff in cm
4.1.5.2.1 Single-ended input
Single-ended inputs measure the voltage between the input signal and ground.
The input voltage needs to be scaled to the ADC ticks and the allowed voltage range.
Single-ended analog inputs are highly susceptible to electromagnetic noise.
Relevant parameters for single-ended inputs are V , V and R .
in in,lim i
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