Schneider ADU 115 | Analog Input Module 4 Channels 4-20mA

The ADU 115 converts analog signals from field sensors into digital PLC values. This input module accepts four independent analog channels for measurement. It handles standard industrial signals like current loops and voltage outputs. Consequently, you can monitor temperature, pressure, flow, and level accurately.

You can configure each channel individually for different signal types. The ADU 115 supports both 4-20 mA current and 0-10V voltage inputs. A built-in 12-bit analog-to-digital converter provides precise measurement resolution. Therefore, this module delivers reliable data for process control applications.

Input Specifications and Channel Details

The module provides four differential input channels with common isolation. Each channel on the ADU 115 operates independently from the others. A shared return line serves all four channels for simplified wiring. The module automatically rejects common-mode noise for stable readings.

Inputs feature overvoltage protection up to 30V DC. The ADU 115 also includes a software-selectable input filter for noise reduction. The module updates all four channels every 25 milliseconds. Below is a complete breakdown of its technical characteristics.

Specification	Detail
Number of Channels	4 (Differential, isolated)
Input Signal Types	4-20 mA, 0-20 mA, 0-10V, ±10V
Resolution	12 bits (4096 counts)
Accuracy	±0.5% of full scale at 25°C
Input Impedance	250 ohms (Current), 100k ohms (Voltage)
Update Time	25 ms (All channels)
Common Mode Rejection	60 dB at 50/60 Hz
Overvoltage Protection	30V DC continuous
Dimensions (W x H x D)	40 mm x 130 mm x 120 mm
Weight	0.35 kg (350 grams)
Power Draw (5V)	200 mA
Power Draw (24V field)	40 mA
Energy Storage	None (No battery or capacitor)

Interface and Field Wiring Connections

A removable terminal block accepts field wiring for all four channels. The ADU 115 uses screw-clamp terminals for secure wire retention. Each terminal accepts wire sizes from 0.2 to 2.5 mm². The module connects to the PLC backplane via a standard 20-pin connector.

You can wire current loops as two-wire or four-wire configurations. The ADU 115 provides a 24V DC output for powering loop-powered transmitters. Green LEDs indicate active communication with the CPU processor. Therefore, troubleshooting faulty field devices becomes much faster.

Operational Benefits for Process Applications

This analog module handles noisy industrial environments without signal degradation. The ADU 115 filters out electrical interference from motors and drives. Its differential inputs reject ground loop voltages automatically. Engineers trust this module for precise measurement in mixing, filling, and heating processes.