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Analog Output#

Chapter goal

Goal: Output distance or magnitude via the analog output.

Prerequisite

The CMTK here is only for parameterization – for measuring or checking a current/voltage value or switching level you must connect the sensor to suitable evaluation or control equipment (e.g. PLC, measuring device).

How it works#

The sensor can output the current distance or magnitude via the analog output at Pin 2 as a voltage or current signal. The parameter tables below give an overview of the relevant settings.

Parameter table
Parameter
Section
Parameter name		 Index
Subindex		 Default
Lower limit measurement range
Sensor Measurement Config
Measurement Range.Lower		 514
1		 300 mm
Upper limit measurement range
Sensor Measurement Config
Measurement Range.Upper		 514
2		 15000 mm
Pin 2 mode
Pin Configuration and Assignment
Pin 2 Function.Pin Mode		 147
2		 Inactive
Analog output signal source
Pin Configuration and Assignment
Pin 2 Analog Configuration.Signal Source		 149
1		 Target Distance
Analog output type
Pin Configuration and Assignment
Pin 2 Analog Configuration.Type		 149
3		 4..20 mA
Pin assignment

IO-Link port (M12, A-coded, socket)

PIN Function
1 24 V
2 Digital output / Analog output
3 0 V
4 IO-Link / Digital output

Configuration#

1. Activate analog output#

Set Pin‑2 mode to Analog Output. You can find the pin configuration under Pin Configuration and Assignment. From factory the pin then outputs distance as a current value (4..20 mA).

Analog output

2. Configure signal source#

You can choose either distance (Target Distance) or magnitude (Target Strength) as signal source.

Info

Distance: Scaled based on the configured measurement range (see step 4). Factory setting: 300 mm to 15000 mm → for 4..20 mA this means 4 mA = 300 mm and 20 mA = 15000 mm.

Magnitude: Fixed range 0 dB to 64 dB → for 4..20 mA this means 4 mA = 0 dB and 20 mA = 64 dB.

Signal source

3. Configure type#

The analog output supports the following current and voltage signals:

  • 4..20 mA
  • 0..20 mA
  • 1..5 V
  • 0..10 V
  • 2..10 V

Analog output type

Note

Current and voltage ranges are nominal. Error and status conditions can exceed upper or lower limits.

Value Meaning
11 V
22 mA		 Sensor in error state
10.5 V
20.5 mA		 Measured value above measurement range
−0.5 V
−0.5 mA		 Measured value below measurement range

4. Configure measurement range#

The measurement range defines scaling (lower / upper limit) for distance. Configuration under Sensor Measurement Config.

Measurement range

Warning

The measurement range also defines the safe measurement range. Values outside the safe range are indicated by a yellow blinking LED.

Convert analog values#

Conversion

Current#

Calculation of output current or back‑calculation to distance:

\[ I_{\text{out}} = I_{\text{min}} + \frac{x - x_{\text{min}}}{x_{\text{max}} - x_{\text{min}}} \cdot (I_{\text{max}} - I_{\text{min}}) \]
\[ x = x_{\text{min}} + (x_{\text{max}} - x_{\text{min}}) \cdot \frac{I_{\text{out}} - I_{\text{min}}}{I_{\text{max}} - I_{\text{min}}} \]
  • \(I_{\text{out}}\): output current
  • \(I_{\text{min}}\): lower current limit (e.g. 4 mA)
  • \(I_{\text{max}}\): upper current limit (e.g. 20 mA)
  • \(x\): measurement value (distance mm or magnitude dB)
  • \(x_{\text{min}}\): lower measurement range limit
  • \(x_{\text{max}}\): upper measurement range limit

Tip

For distance the measurement range is configurable. Factory settings: 300 mm to 15000 mm. For magnitude the range is fixed at 0 dB to 64 dB.

Example: For a measurement of 800 mm in the range 300–1300 mm:

\[ I_{\text{out}} = 4\,\text{mA} + \frac{800\,\text{mm} - 300\,\text{mm}}{1300\,\text{mm} - 300\,\text{mm}} \cdot (20\,\text{mA} - 4\,\text{mA}) = 4\,\text{mA} + 0.5 \cdot 16\,\text{mA} = 12\,\text{mA} \]
\[ x = 300\,\text{mm} + (1300\,\text{mm} - 300\,\text{mm}) \cdot \frac{12\,\text{mA} - 4\,\text{mA}}{20\,\text{mA} - 4\,\text{mA}} = 300\,\text{mm} + 1000\,\text{mm} \cdot 0.5 = 800\,\text{mm} \]

Voltage#

Analog voltage:

\[ U_{\text{out}} = U_{\text{min}} + \frac{x - x_{\text{min}}}{x_{\text{max}} - x_{\text{min}}} \cdot (U_{\text{max}} - U_{\text{min}}) \]
\[ x = x_{\text{min}} + (x_{\text{max}} - x_{\text{min}}) \cdot \frac{U_{\text{out}} - U_{\text{min}}}{U_{\text{max}} - U_{\text{min}}} \]
  • \(U_{\text{out}}\): output voltage
  • \(U_{\text{min}}\): lower voltage limit (depends on type)
  • \(U_{\text{max}}\): upper voltage limit
  • \(x\): measurement value (distance mm or magnitude dB)
  • \(x_{\text{min}}\): lower measurement range limit
  • \(x_{\text{max}}\): upper measurement range limit