Schneider DAU 109 VDC Logic I/O Module

This logic I/O module processes digital signals for Schneider Electric control systems. It handles both input and output functions within a single compact unit. You can deploy this module for discrete machine control and automation tasks.

Technical Specifications

Parameter	Value
Model	Schneider DAU 109
Category	VDC Logic I/O Module
Number of Inputs	8 points
Input Voltage Range	10–30 VDC
Input Current per Point	6 mA typical at 24 VDC
Input Impedance	4 kΩ per channel
Number of Outputs	8 points
Output Type	DC sink (NPN, open collector)
Output Current per Point	0.3 Amps maximum
Output Voltage Drop	1.2 VDC at full load
Isolation	1000 VAC optical (field to logic)
Internal Power Draw	180 mA from 24 VDC supply
Dimensions (W x H x D)	7.0 cm × 12.5 cm × 5.8 cm
Weight	0.42 kg (0.93 lbs)
Connector Type	One 25-pin D-sub (female)
Component Count	1 main board + 8 optoisolators + 8 transistors + 16 LEDs
Energy Storage	100 µF hold-up capacitor (logic side)

Input Section Design

The Schneider DAU 109 provides eight DC inputs for sensor and switch connections. Each channel accepts signals from 10 to 30 VDC without damage. A 6 mA current draw ensures compatibility with most proximity and photoelectric sensors. Green LEDs illuminate individually when an input detects an active signal.

Output Section Features

Eight NPN output channels drive small relays, solenoids, or indicator lamps. Each point handles up to 0.3 Amps of continuous DC current. An open-collector design allows you to connect external pull-up resistors for different voltages. Red LEDs show the real-time status of each output channel.

Signal Isolation and Noise Rejection

Optical isolators separate every I/O point from the internal logic bus. This 1000 VAC rating prevents ground loops in mixed-voltage panels. Consequently, the module performs reliably near variable frequency drives and contactors. You do not need external isolators for standard industrial applications.

Installation and Connectivity

Mount this module vertically inside a control cabinet on DIN rail. A single 25-pin D-sub connector carries all field I/O signals to a terminal block. The unit draws 180 mA from an external 24 VDC power supply. For best results, use shielded cable for input wiring longer than 15 meters.

Visual Status Indication

Sixteen LEDs provide immediate feedback for every I/O channel. Green LEDs display the ON/OFF states of all eight inputs. Red LEDs illuminate when their corresponding outputs turn ON. Therefore, technicians can troubleshoot machine faults without opening the cabinet door.

Energy Storage and Protection

A 100 µF capacitor maintains logic power during brief supply interruptions. Each output includes built-in overcurrent protection against short circuits. Thermal shutdown activates automatically if any channel exceeds safe temperatures. This design protects both the module and your connected field devices.

Why Choose This Module

This I/O module fits directly into Schneider Electric TSX series PLC racks. Its 8-in / 8-out configuration matches many small machine applications perfectly. Therefore, this unit suits packaging equipment, conveyors, and assembly stations.