Product Details

Baumuller 3.7805-C is a legacy rack plug-in fieldbus communication board and bus interface PCB designed for Baumuller rack-based automation and servo control systems. This fieldbus communication board acts as a dedicated network adapter, enabling high-speed bidirectional data exchange between the rack master controller, servo drive modules and upper-level PLC or host automation systems. The bus interface PCB integrates isolated bus transceivers, data buffers, address configuration circuits and error detection logic to transmit motion commands, operating status, fault codes and parameter data reliably over industrial fieldbus cables. It supports station address setup, baud rate adjustment and bus diagnostic functions for easy commissioning and troubleshooting. The multi-layer FR4 circuit board is conformal coated to shield electronic components and signal traces from dust, moisture and corrosive vapors inside industrial control cabinets. As an obsolete and hard-to-source discontinued spare, it serves as a direct drop-in replacement to restore fieldbus networking and centralized remote control for ageing Baumuller control racks.

Basic Parameters

Brand: Baumuller

Model: 3.7805-C

Product Type: Isolated fieldbus communication interface PCB card

Main Function: Fieldbus data transceiver, galvanic signal isolation, command forwarding, status upload, bus error diagnosis and station configuration

Interfaces: Fieldbus terminal connector, rack backplane edge connector, communication activity and fault LED indicators

PCB Treatment: Conformal coated multi-layer circuit board, UL 94V-0 flame retardant

Mounting: Plug-in installation for compatible legacy Baumuller control racks

Auxiliary Supply: 24 V DC logic supply

Net Weight: Approximately 225 g

Condition: Original discontinued industrial spare

Supported Functions

This fieldbus communication board supports synchronized multi-axis networking for automated production lines. The bus interface PCB receives motion setpoints and control instructions from the host controller and forwards these commands to corresponding servo drive boards, while feeding back real-time speed, position, torque and fault information to the upper system. It continuously monitors bus signal integrity and triggers communication fault alarms when signal interruption, bus conflict or wiring failure occurs. It works cooperatively with the master control board, analog I/O board, digital I/O board and servo power modules to realize centralized automation control. If this network adapter card fails, the entire rack will drop off the fieldbus network and lose remote command access.

Core Functions

The core function of this fieldbus communication board is to provide an isolated industrial bus gateway for the Baumuller rack control system. It converts internal parallel control logic signals into standardized fieldbus data frames and ensures stable data transmission over long cables. Built-in isolation circuits eliminate ground loop interference and protect the rack controller against surge noise from the bus line. This bus interface PCB is an indispensable spare to rebuild the network communication channel of legacy motion machinery and resume coordinated multi-axis automatic operation.

Hardware Specifications & Environmental Features

Operating Temperature: 0°C ~ +60°C

Storage Temperature: -20°C ~ +75°C

Relative Humidity: 5%–95%, non-condensing

Housing: Bare coated PCB with bus signal terminals

Protection: ESD protection for bus ports, bus short-circuit isolation, watchdog communication supervision, IP20

Anti-interference: Isolated power domain and EMI filtering circuits to suppress electromagnetic noise inside cabinets

Compatibility: Suitable for legacy Baumuller modular control racks and matched servo drive units

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm 800 series backplane compatibility, pulse signal type, counting mode and preset logic before ordering.

This is from our current stock.

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