Schneider BMXNRP0200 Profibus DP Module

The Schneider BMXNRP0200 (also BMX NRP 0200) is a Profibus DP slave communication module for the Modicon M340 programmable logic controller platform. It enables the M340 CPU to exchange process data with a Profibus DP master (e.g., Siemens S7, Schneider Quantum, or any other Profibus master). The module provides high‑speed data transfer up to 12 Mbit/s and is fully compliant with EN 50170 and IEC 61158 standards.

Technical Specifications

The BMXNRP0200 communicates via a 9‑pin D‑sub female connector (Profibus standard). Supported baud rates: 9.6 kbit/s to 12 Mbit/s (automatic detection). Maximum data length: 244 bytes for input and 244 bytes for output per slave. The module is galvanically isolated between Profibus side and M340 backplane (1500V). Power consumption from M340 rack: 100 mA at 5V DC. The module occupies one slot in the M340 rack (width 32 mm). Operating temperature 0‑60°C. Storage -25‑85°C. Humidity 10‑95% non‑condensing. Protection rating IP20. The front panel includes two status LEDs (RUN and ERR) and one 9‑pin D‑sub connector for the Profibus cable.

Key Features

• Profibus DP slave, compliant to DP‑V0

• Automatic baud rate detection (up to 12 Mbit/s)

• Galvanic isolation for noise immunity

• Simple configuration via Unity Pro or SoMachine

• Up to 244 bytes input / 244 bytes output data

• Diagnostic features (Module status, Profibus status)

• Compatible with all M340 CPUs (BMX P34 2000/3000)

Integration with M340

The BMXNRP0200 plugs into any slot of an M340 rack (except the CPU slot). It is configured as a Profibus slave device in Unity Pro XL (or EcoStruxure Control Expert). The user defines a data exchange image: an array of input words (from master to slave) and output words (from slave to master). These data blocks are automatically mapped to the CPU’s memory and can be read/written using standard variables. The module also supports diagnostic messages which are stored in the CPU’s event buffer. The Profibus address (0‑125) is set using two rotary switches on the module’s front.

Wiring and Installation

Connect the Profibus cable (shielded twisted pair, type A) to the D‑sub connector. Pin assignments: 3 = B (positive), 8 = A (negative), 5 = shield. The cable shield must be grounded at both ends. Termination resistors (220/390/390 Ω) must be active at both ends of the Profibus segment; the BMXNRP0200 does not have an internal termination, so an external terminator plug must be used when it is at the physical end of the segment. Mount the module on the DIN rail inside the M340 rack. Ensure the module is correctly seated and locked.

Configuration in Unity Pro

In the hardware configuration tree, add the BMXNRP0200 from the Profibus library. Set the slave address (match the rotary switches). Then configure the I/O data mapping: define the size of input and output areas (in bytes). The data consistency is configurable per byte, word, or full length. After generating the configuration, the user program can access the data via standard %IW and %QW variables. The module also provides health bits (e.g., “BMXNRP0200.CommOK”) to monitor the connection to the master.

Applications

The BMXNRP0200 is used when a Modicon M340 PLC must be integrated into an existing Profibus DP network (common in automotive, material handling, and process industries). It allows the M340 to act as a remote I/O device or exchange data with a higher‑level PLC. It is also suitable for connecting the M340 to Profibus‑based HMIs, drives, or SCADA systems.

Diagnostics and Troubleshooting

The two LEDs provide quick status: RUN (green) indicates power and internal communication OK; ERR (red) indicates a problem (no Profibus communication, wrong address, or data mismatch). If ERR is on, check the Profibus cable termination, the slave address, and the GSD file settings in the master. Use Unity Pro to read the module’s diagnostic word, which reports specific errors (bus fault, parameterization error, configuration error).

Standards and Compliance

The BMXNRP0200 meets CE, UL, and CSA standards. It is RoHS compliant. Profibus certification by PNO (Profibus Nutzerorganisation) ensures interoperability with other certified devices.

Conclusion

The Schneider BMXNRP0200 Profibus DP module expands the connectivity options of Modicon M340 PLCs, enabling seamless integration into Profibus networks. Its robust design, easy configuration, and reliable data transfer make it a practical choice for automation systems requiring mixed vendor equipment.