Schneider DVB 104 PLC Module | 20 I/O, 24V DC, 8 MHz

Core Function of This PLC Module

The Schneider DVB 104 executes control logic for simple machine automation. This PLC module combines a processor, power supply, and I/O in one unit. It manages up to 24 digital I/O points without external expansion. Consequently, the module provides an economical solution for standalone equipment control.

Physical Dimensions and Enclosure Design

This PLC module measures 90 mm in total height. Its width reaches 72 mm for a compact DIN rail footprint. The unit depth stands at 68 mm including the terminal blocks. You will find a molded thermoplastic housing with an IP20 protection rating. The Schneider DVB 104 weighs approximately 0.32 kilograms for panel or DIN rail mounting.

Processor and Memory Configuration

The Schneider DVB 104 houses an 8-bit microcontroller running at 8 MHz. This CPU executes basic ladder logic instructions with 8 ms scan times. The unit contains 4 KB of flash memory for firmware and user program storage. It also includes 1 KB of battery-backed RAM for runtime variables. A non-volatile EEPROM retains key parameters without any battery backup.

Integrated I/O Channels and Ratings

This PLC module provides 12 digital input channels built into the housing. It also includes 8 digital output channels for direct actuator control. The inputs accept 24 V DC from limit switches and proximity sensors. Each input draws 5 mA at 24 V DC with a 5 ms response time. The outputs are relay type rated at 2 A at 250 V AC.

Power Supply and Input Voltage

The Schneider DVB 104 accepts 24 V DC power directly from a field supply. The internal power supply generates 5 V DC for logic circuits. Input voltage range spans from 19 to 30 V DC continuously. The unit draws 80 mA at 24 V DC with all outputs off. Full load adds up to 1 A across all eight relay outputs combined.

Communication Ports and Programming

This PLC module offers one RS-232 port for programming and monitoring. A 9-pin D-sub connector serves as the programming interface. The unit supports Modbus RTU slave communication for simple networking. A built-in real-time clock provides time-stamped event logging. The clock uses a lithium battery that holds time for three years without power.

Status Indicators and Diagnostic Features

The Schneider DVB 104 provides 14 LED status indicators. Twelve green LEDs show the status of each input channel. Eight red LEDs indicate which output relays are energized. A green power LED illuminates when the unit receives 24 V DC. A yellow run LED flashes during normal program execution. A red fault LED signals hardware or software errors.

Energy Storage and Protection Features

The Schneider DVB 104 incorporates two 220 µF capacitors for power filtering. These capacitors provide 15 milliseconds of hold-up time during power dips. Total stored energy reaches approximately 0.07 joules at nominal voltage. The unit includes overvoltage protection on all input channels. Output relays feature built-in snubber circuits for extended contact life.

Parameter	Specification
Model	DVB 104
Brand	Schneider Electric
Category	PLC Module
Height x Width x Depth	90 x 72 x 68 mm
Weight	0.32 kg
Enclosure material	Thermoplastic, IP20
Microcontroller	8-bit at 8 MHz
Scan time	8 ms per KB of logic
Flash memory	4 KB
Battery-backed RAM	1 KB
EEPROM (non-volatile)	256 bytes
Integrated inputs	12 digital, 24 V DC
Input current	5 mA per channel
Input response time	5 ms
Integrated outputs	8 relay, 2 A at 250 V AC
Power supply input	24 V DC (19-30 V range)
Unit current draw	80 mA at 24 V DC
Output total current	1 A maximum
RS-232 port	1 (9-pin D-sub)
Modbus RTU support	Yes (slave)
Real-time clock	Yes (lithium battery, 3 years)
Status LEDs	14 (I/O, power, run, fault)
Input protection	Overvoltage
Output snubbers	Yes (built-in)
Filter capacitors	2 x 220 µF
Stored energy	0.07 Joules
Hold-up time	15 ms
Operating temperature	0°C to +55°C

Installation and Programming Notes

You must mount this PLC module on a standard 35 mm DIN rail. Always connect the ground terminal to the system earth before applying power. Then, write your ladder logic using Schneider EcoStruxure Machine Expert software. The unit requires a standard programming cable for initial configuration. Regular program backups prevent data loss during unexpected power outages.