B&R 3IF771.9 Interface Module

B&R 3IF771.9 Interface Module (CAN Bus Communication Interface Module – System 2005 / aPCI Module)

The B&R 3IF771.9 is a communication interface module used in the B&R System 2005 / aPCI platform. It is mainly designed to add a CAN bus interface (and in some variants also fieldbus communication capability) to a B&R controller system.

Product Information

• Brand: B&R Automation (Austria)
• Model: 3IF771.9
• Series: System 2005 / aPCI interface modules
• Type: Industrial communication interface module
• Interface: CAN bus (1 channel)
• Transfer rate: up to 500 kbit/s
• Max distance: up to 1000 m (CAN network dependent)
• Isolation: Electrically isolated PLC interface
• Mounting: Slot / aPCI backplane system
• Power consumption: ~1.3 W total

What it actually is

This module is used to add communication capability to a PLC system, especially:

• CAN bus networking
• Connecting distributed I/O or drives
• Linking field devices in automation systems
• Expanding controller communication ports

It does NOT execute control logic itself.

System Role (Simple)

PLC CPU (B&R controller)
→ 3IF771.9 interface module (this unit)
→ CAN bus network
→ I/O modules / drives / field devices

So it acts like a “communication gateway inside the PLC system.”

Key Features

• 1 × CAN bus interface
• Industrial real-time communication support
• Electrically isolated signal transmission
• LED status indication (Tx/Rx monitoring)
• Designed for modular B&R System 2005 architecture
• Stable long-distance CAN communication (up to ~1000 m)

Typical Applications

• Industrial CAN bus networks
• Machine automation systems
• Distributed I/O communication
• Drive and motion system communication
• Legacy B&R System 2005 PLC installations

Advantages

• Reliable CAN communication interface
• High noise immunity (industrial isolation)
• Easy integration into B&R controller systems
• Stable real-time data exchange
• Compact modular design

Important Notes

• Not PLC CPU ❌
• Not I/O module ❌
• Not power supply ❌
• Not controller logic module ❌
• It is a CAN bus communication interface module (system expansion card) ✔

Precautions

• Must be installed in compatible B&R System 2005 aPCI slot
• Requires correct terminal block (TB704) for connection
• CAN bus requires proper termination resistors
• Not interchangeable with modern X20 system modules
• System configuration required in Automation Studio