B&R X20IF1030 RS485/RS422 Interface Module for X20 System

The B&R X20IF1030 is a communication interface module designed for the X20 control system. It provides a single RS‑485/RS‑422 channel, allowing the X20 CPU to connect to serial devices such as variable frequency drives, sensors, HMIs, and barcode readers. The module features electrical isolation between the interface and the PLC backplane, ensuring reliable communication in electrically noisy industrial environments. With a maximum baud rate of 115.2 kbps and a 16‑byte FIFO buffer, the X20IF1030 supports efficient data handling for protocol‑based and free‑format serial communication.

Technical Specifications

• Model: X20IF1030

• B&R ID Code: 0x1F28

• Interface Type: 1 × RS‑485/RS‑422 (software configurable)

• Connector: 9‑pin female D‑SUB

• Transfer Rate: Max. 115.2 kbps (standard speeds up to 115,200 baud)

• FIFO Buffer: 16 bytes (transmit and receive)

• Maximum Cable Length: 1,200 m (RS‑485)

• Electrical Isolation: Yes (PLC isolated from RS‑485/RS‑422)

• Terminating Resistor: External (using T‑connector 0G1000.00‑090)

• Controller Type: UART 16C550 compatible

• Power Consumption: 0.42 W

• Operating Temperature: -25°C to +60°C (horizontal mounting)

• Storage Temperature: -40°C to +85°C

• Protection Rating: IP20

Functional Description

The X20IF1030 expands the communication capabilities of an X20 CPU by adding a serial channel. The interface can be configured either as RS‑485 (half‑duplex, multi‑drop) or RS‑422 (full‑duplex, point‑to‑point). Configuration is performed through the B&R Automation Studio project environment, where parameters such as baud rate, parity, data bits, and stop bits are defined. The module supports both standard protocols (Modbus RTU, Profibus DP via gateway) and user‑defined serial protocols implemented in the application program.

Isolation and Diagnostics

The channel is electrically isolated from the PLC logic, preventing ground loops and protecting the controller from voltage spikes on the communication line. Two status LEDs on the front panel indicate module status and data transfer activity. The module also provides diagnostic functions that can report communication errors, line breaks, and buffer overruns to the application.

Integration with Automation Studio

The X20IF1030 is configured within the X20 system project using B&R Automation Studio. The module appears as a peripheral device in the hardware tree. The user can assign a serial channel number and set the protocol parameters. For Modbus RTU communication, the software includes ready‑to‑use function blocks that handle master or slave functionality. For custom protocols, the serial receive/transmit functions provide fine control over byte‑by‑byte transmission.

Environmental and Compliance

The module has approvals for hazardous locations: ATEX Zone 2 (II 3G Ex nA nC IIA T5 Gc), cULus HazLoc Class I Division 2, and marine standards (DNV GL, LR, ABS). Operating humidity: 5–95% non‑condensing. Vibration resistance: 4g (DNV GL vibration class B). The coated variant (X20clF1030) is available for corrosive environments.

Typical Applications

The X20IF1030 is used to connect third‑party VFDs via Modbus RTU, to interface with serial weight scales or barcode scanners, and to communicate with older PLC systems via a serial gateway. It is also used for custom sensor networks where RS‑485 multi‑drop communication is required.

Conclusion

The B&R X20IF1030 provides a flexible, isolated serial interface for X20 controllers, enabling cost‑effective integration of serial devices into modern automation architectures.