# Analog Input Module Wiring

This guide covers Voldeno Analog Input module (AIN-A-D-1) wiring: the terminal map, connecting four 0-10 V voltage inputs, four 0/4-20 mA current inputs, and the Voldeno Bus connector. Ratings and use cases are on the Analog Input product page.

# Module overview

The 2-DIN Analog Input module brings classic transducer signals into a Voldeno installation:

Area	Channels	Range
Voltage inputs	4 (V1–V4)	0-10 V
Current inputs	4 (C1–C4)	0/4-20 mA
Bus	1 × Voldeno Bus	24 V DC supply, GND, CAN-FD (BUS+, BUS−)

The module provides 8 independent analog inputs in total. Scale and filter each channel separately in Voldeno Studio (units, thresholds, charts). Typical uses include pressure, humidity, CO₂, level, and temperature probes, plus auxiliary signals from boilers, pumps, and air-handling units.

# Terminal map

Input terminals are on the top edge of the module; the bus connector is on the bottom.

# Top block: analog inputs

Terminal	Input type
V1, V2, V3, V4	Voltage 0-10 V
C1, C2, C3, C4	Current 0/4-20 mA

The upper row carries V1–V4; the row below carries C1–C4 on the AIN-A-D-1 module.

# Bottom row: Voldeno Bus

Terminal	Function
24V	Module supply from the bus
GND	Module ground and common signal reference
BUS+	CAN High
BUS−	CAN Low

GND on the bus connector is the shared reference for connected sensors (signal return). Bus topology is described in Bus topology and wiring.

# Connecting sensors

The module accepts typical HVAC and building-automation transducer outputs. The diagram below shows four example signal types, sensor power from the panel, and the shared GND reference.

Example on diagram	Terminal	Notes
0-10 V sensor	V1	Full voltage input range; 3-wire power
0-5 V sensor	V2	Fits a 0-10 V channel; set scaling in Studio
0-20 mA loop	C3	Current input; 3-wire layout with separate supply on the diagram
4-20 mA loop	C4	2-wire loop; no separate sensor supply

# Sensor power supply

The Analog Input module does not power sensors from Vx, Cx, or the Voldeno Bus (except GND as the signal reference). The diagram shows power from a separate source in the panel (+V block and GND bus).

1. Choose supply voltage and power only per the sensor datasheet (e.g. 24 V DC, 12 V DC). The level must match that sensor model, not the AIN module.
2. 3- or 4-wire sensors (typical 0-10 V, 0-5 V, some 0-20 mA layouts): connect separate +V and GND from an auxiliary supply, as in the diagram. Tie the supply ground to module GND.
3. 2-wire 4-20 mA loops (active transmitter): energy comes from the loop itself. Do not add a separate supply unless the manufacturer requires it (as in the 4-20 mA example on the diagram).
4. Select and protect the sensor supply independently of the Voldeno module. Do not exceed rated voltage on Vx inputs and do not feed loops from Cx terminals.

# Voltage inputs (V1–V4)

1. Connect the sensor signal output (e.g. 0-10 V or 0-5 V) to V1, V2, V3, or V4.
2. Connect the sensor signal ground to module GND (common reference, as in the diagram).
3. Power the sensor from an external source per its datasheet (3- or 4-wire layout). Set supply voltage per the manufacturer specification.
4. In Voldeno Studio, set input type, source range (e.g. 0-5 V on a 0-10 V channel), and target unit.

Do not exceed 10 V on Vx terminals. For non-standard ranges, use an external signal converter.

# Current inputs (C1–C4)

1. Connect the sensor current loop output (0-20 mA or 4-20 mA) to C1, C2, C3, or C4.
2. Connect the other loop pole (return or ground) to module GND when the sensor layout requires it.
3. 2-wire loop (4-20 mA): the loop itself provides power; no separate +V to the sensor is needed. 3-wire loop (e.g. 0-20 mA): add supply per the datasheet, as in the diagram.
4. In Studio, select loop type (0-20 mA or 4-20 mA) and scaling to the physical quantity.

The module measures current in the input path. Do not power loops or sensors from the Analog Input Cx terminals.

# Installation sequence

1. Mount the module on the DIN rail. Power the Voldeno Bus according to bus topology.
2. Connect 24V, GND, BUS+, and BUS− to the adjacent module or bus segment.
3. Confirm in Voldeno Studio that module AIN-A-D-1 appears in the device list.
4. Route analog signal cables separately from power wiring. Wire sensor supplies (where required), signals to V1–V4 or C1–C4, and GND.
5. In Studio, configure each channel: signal type, scaling, filter, and units.
6. Compare module readings with a reference (multimeter, transducer display) and adjust coefficients.

# Questions and answers

Can I connect a 0-5 V sensor to a 0-10 V input?
Yes. Use a Vx terminal and set a 0-5 V input range plus scaling to the physical value (e.g. % RH, °C) in Studio.

What is the difference between 0-20 mA and 4-20 mA?
Both connect to C1–C4. Select the loop type in Studio. 4-20 mA allows broken-loop detection (signal below 4 mA).

Do all sensors need a common GND?
Yes. Sensor signal returns should tie to module GND, as in the diagram, so voltage and current measurements share one reference.

When should I choose Analog Input instead of 1-Wire?
1-Wire supports up to 40 temperature sensors on a digital bus. Analog Input is the right choice when you already have a 0-10 V or 4-20 mA transducer (HVAC, BMS, plant room) and want to integrate it into Voldeno logic without rewiring.

Does the module power the sensors?
No. When sensors need a supply, feed it from a separate source in the panel, with voltage and power per the sensor datasheet. The exception is 2-wire 4-20 mA loops, where the loop itself provides power.

Do analog inputs work with the I/O module?
Yes. Analog Input readings can drive the same logic as digital inputs and relay outputs from I/O and RELAY in Voldeno Studio.

# Next steps

• Analog Input module — specifications and use cases
• I/O module wiring — digital inputs and relay outputs
• 1-Wire module wiring — temperature sensors on 1-Wire
• Define logic in Voldeno Studio
• Bus topology and wiring