Technical Specifications
| Parameter Name | Value |
|---|---|
| Product Model | B&R 3IF681.96 |
| Manufacturer | B&R Industrial Automation (ABB Group) |
| Product Type | Interface Communication Module |
| Series | System 2005 PCC |
| Compatible Slots | CP260 interface slot / IF260 interface module |
| Interface IF1 – RS232 | 9-pin DSUB male connector |
| RS232 Controller | ST16C650 UART with 32-byte TX/RX FIFO |
| RS232 Maximum Baud Rate | 115.2 kbaud |
| RS232 Maximum Distance | 15 m at 19,200 baud |
| RS232 Handshake Lines | DTR, DSR, RTS, CTS |
| RS232 Electrical Isolation | No |
| Interface IF2 – Ethernet | 10BASE-T twisted pair RJ45 female connector |
| Ethernet Controller | AM79C960 with 128 KB send/receive buffer |
| Ethernet Maximum Speed | 10 Mbit/s |
| Ethernet Electrical Isolation | Yes |
| Ethernet Bus Capable | Yes |
| Power Consumption (5 V DC) | 1.65 W maximum |
| Power Consumption (24 V DC) | N/A |
| Operating Temperature | 0°C to +60°C (within system cabinet) |
| Certifications | CE, cULus E115267 |
| Weight | 0.10 kg |
| Dimensions (L × W × H) | 1.80 × 8.60 × 14.00 cm |
| Country of Origin | Austria |
Main Features and Advantages
The B&R 3IF681.96 delivers reliable, industrial-grade communication capability through its carefully engineered dual-interface architecture, making it an indispensable module for System 2005 installations. The serial interface, powered by the ST16C650 UART controller, provides asynchronous serial communication with a maximum speed of 115.2 kbaud, making it suitable for connecting legacy field devices, programming terminals, and diagnostic equipment. Although the interface does not include electrical isolation—a factor that demands careful attention to grounding and installation practices—it is equipped with input filtering and protective circuitry that maintains signal integrity in typical industrial environments. The inclusion of hardware handshake lines including DTR, DSR, RTS, and CTS ensures reliable flow control, preventing data loss during critical communication sessions .
The Ethernet interface of the B&R 3IF681.96 is designed around the AM79C960 controller, featuring a 128 KB send/receive buffer and 10BASE-T twisted pair connectivity via a standard RJ45 connector. This interface offers complete electrical isolation, protecting the control system from potential ground loops or voltage differentials that could compromise system stability. As a bus-capable interface, the Ethernet port supports network connectivity for INA2000 station addressing, configured through dual BCD rotary switches on the module face, facilitating integration into broader industrial network architectures .
A key advantage of the B&R 3IF681.96 is its exceptional power efficiency, consuming only 1.65 W maximum, which minimizes thermal load within the control cabinet and contributes to overall system reliability. The module’s compact single-width form factor allows space-efficient deployment in rack-based systems, while its compatibility with both CP260 and IF260 slots provides flexible installation options. For operators maintaining legacy System 2005 automation networks, the B&R 3IF681.96 represents an authoritative, manufacturer-supported solution backed by comprehensive documentation, hardware upgrades, and technical specifications available through B&R’s Automation Studio platform. The clear LED indicators for transmit/receive and Ethernet link/activity status simplify installation verification and field troubleshooting, enabling maintenance personnel to quickly assess module operational health .
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