Principle Drawings

The diagrams show how to mount the transmitter in principle. Terminal names vary by controller, so always use the terminal names from the device IO list and the project diagram.

Generic diagram name	Meaning	FlexVander LX9 eco example	Where to confirm
Sensor supply +	Positive supply from the controller when the transmitter is powered by the controller.	DCOUT	Device IO list and project diagram.
Supply 0V	Supply return for the transmitter.	SGND	Device IO list and project diagram.
Analog input	The controller input that reads the 4-20 mA or 0-10 V signal.	AI1 or AI2	Device IO list and parameter setup.
Analog reference	Reference for the analog signal.	AGND	Device IO list and project diagram.

Input Mode Selection

Signal type	Input mode	Check
4-20 mA transmitter	Current input	Install or select current input on the controller. The configured signal type and scaling must match the transmitter range.
0-10 V transmitter	Voltage input	Remove or select voltage input on the controller. Do not use 0-10 V while the input is set for current input.

Diagram Legend

Line	Meaning
Blue	Supply positive.
Grey	Supply return or signal reference.
Green	Analog signal into the controller input.
Dashed grey	Reference or common connection that must follow the project diagram.

Which Diagram Should I Use?

Transmitter nameplate or terminals	Use this diagram
Two terminals and output marked 4-20 mA	4-20 mA two-wire loop
Separate supply terminals and output terminals	4-20 mA powered transmitter
Separate field power supply is used	4-20 mA transmitter with external supply
Output marked 0-10 V	0-10 V voltage transmitter

4-20 mA Two-Wire Loop

A two-wire transmitter uses the same loop for supply and signal. The controller input must be set as a current input.

Transmitter terminal	Controller terminal principle	Use
+	Sensor supply +	Supply positive from the controller when the project uses controller supply.
- / signal	Analog input	Current loop signal into the selected analog input.
Reference if required	Analog reference	Follow the project diagram for any common reference between transmitter supply return and analog reference.

4-20 mA Powered Transmitter

A powered 3-wire or 4-wire transmitter has separate supply terminals and output terminals. The controller input must be set as a current input.

Transmitter terminal	Controller terminal principle	Use
Supply +	Sensor supply + or external supply +	Power the transmitter according to its nameplate.
Supply 0V	Supply 0V or external 0V	Supply return. If the output is not isolated, the analog reference must be common as shown in the project diagram.
OUT+ / Iout	Analog input	Current signal into the selected analog input.
OUT- / reference	Analog reference	Reference for the analog signal.

4-20 mA Transmitter With External Supply

Use an external supply when the transmitter requires another voltage, more current than the controller can supply, or separate field power.

Transmitter terminal	Controller or supply terminal principle	Use
Supply +	External supply +	Positive field supply for the transmitter.
Supply 0V	External supply 0V	Supply return. Connect common reference according to the project diagram unless the output is isolated.
OUT+	Analog input	Current signal into the selected analog input.
OUT- / reference	Analog reference	Reference for the analog signal.

0-10 V Voltage Transmitter

A voltage transmitter sends a voltage signal between the output terminal and the signal reference. The controller input must be set as a voltage input.

Transmitter terminal	Controller terminal principle	Use
Vout / 0-10 V	Analog input	Voltage signal into the selected analog input.
0V / common	Analog reference	Reference for the voltage signal.

Commissioning Checks

• Confirm transmitter output type and measurement range before wiring.
• Confirm the controller input mode matches the signal type.
• Confirm supply voltage and available current for the transmitter.
• Confirm signal reference according to the project diagram.
• Check the live analog value before enabling automatic control or alarms.