Schneider DEA 105 | Bitbus Coupler for Modicon PLC Networks

The DEA 105 connects distributed I/O stations to a Modicon PLC via Bitbus. This communication coupler manages data exchange between the controller and remote modules. It reduces field wiring by placing I/O near the actual machinery. Consequently, you save installation costs and simplify system troubleshooting.

You can use this coupler with the Modicon 800 series processors. The DEA 105 supports up to ten slave devices on a single network. It operates as a master on the Bitbus communication link. Therefore, engineers gain flexible distributed control for factory automation.

Network Specifications and Communication Details

The coupler uses RS-485 differential signaling for noise immunity. The DEA 105 achieves transmission rates up to 375 kbit/second. It supports cable lengths up to 300 meters between the furthest nodes. The module automatically handles telegram formatting and error checking.

A built-in termination resistor ensures proper signal quality on long runs. The DEA 105 also provides diagnostic LEDs for network troubleshooting. It stores configuration parameters in non-volatile memory permanently. Below is a complete breakdown of its technical characteristics.

Specification	Detail
Product Type	Bitbus Network Coupler
Network Protocol	Bitbus (Intel 8044 Based)
Physical Layer	RS-485 (Differential)
Transmission Rate	62.5 kbit/s to 375 kbit/s (Selectable)
Maximum Nodes	10 (Per master)
Maximum Cable Length	300 meters (At 187.5 kbit/s)
Termination	Built-in 120 ohm (Switchable)
Interface Type	9-pin D-sub female
Dimensions (W x H x D)	40 mm x 130 mm x 120 mm
Weight	0.32 kg (320 grams)
Power Draw (5V)	150 mA
Power Draw (24V)	80 mA
Configuration Memory	2 KB EEPROM (Non-volatile)
Energy Storage	None (No battery)

Interface Layout and Connection Options

The module features one 9-pin D-sub female connector for network access. The DEA 105 includes a separate terminal block for 24V DC power input. Two rotary switches set the node address on the Bitbus network. Three LEDs indicate RUN, COMM, and ERROR status conditions.

Push buttons on the front panel allow manual reset and configuration access. The DEA 105 fits into any standard Modicon rack slot directly. It requires no external power supply beyond the backplane connection. Therefore, installation follows the same procedure as standard I/O modules.

Operational Benefits for Distributed Systems

This coupler eliminates long home-run cables from field devices. The DEA 105 lets you place I/O modules close to sensors and actuators. It simplifies system expansion when adding new machinery to a line. Maintenance teams appreciate the diagnostic LEDs for rapid fault location.