Schneider BMXP3420102 Modicon M340 Processor Module for Discrete and Analog Control

Product Introduction

When a mid-sized manufacturing line requires scalable control without sacrificing performance, the Schneider BMXP3420102 Modicon M340 processor module delivers a balanced solution. Designed for distributed automation architectures, this module handles up to 1024 discrete I/O in multi-rack configurations and 256 analog I/O, making it suitable for applications that mix digital sensors with analog transmitters. Its integrated Modbus serial ports and CANopen master bus allow direct connection to variable frequency drives, remote I/O blocks, and operator interfaces, reducing the need for additional communication modules.

Technical Specifications Breakdown

The BMXP3420102 provides 4096 kB internal RAM, with 3584 kB dedicated to programs, constants, and symbols. This memory allocation supports complex control logic and data handling without external storage for routine operations. Execution speed reaches 0.12 µs for Boolean instructions and 1.16 µs for floating point operations, enabling fast loop closure in motion or process control tasks. The module supports one cyclic/periodic master task, one periodic fast task, and up to 64 event tasks, offering flexibility for time-critical responses.

Communication is a key strength. The processor includes a non-isolated serial link with RJ45 connectors supporting Modbus RTU/ASCII and character mode at speeds from 0.3 to 19.2 kbit/s, plus a USB port at 12 Mbit/s for local programming. The CANopen master interface uses a SUB-D 9 connector and supports transmission rates from 20 kbit/s to 1 Mbit/s, with bus lengths up to 2500 m at lower speeds. This allows the BMXP3420102 to coordinate up to 63 CANopen slave devices across a distributed network.

Industry Applications

In a packaging line, the BMXP3420102 can manage 256 analog inputs from temperature and pressure sensors while controlling 1024 discrete outputs for actuators and conveyors. Its 36 application-specific channels handle specialized functions like high-speed counting or pulse train output, reducing the need for dedicated modules. For water treatment plants, the processor’s ability to run 64 event tasks ensures rapid response to alarm conditions, while the Modbus serial links connect to remote terminal units and SCADA systems.

The module also fits machine tool applications where CANopen motion control coordinates servo drives. With independent axis control via CANopen, the BMXP3420102 synchronizes multiple axes for precise positioning, leveraging the 0.12 µs Boolean execution for real-time interlocking.

Installation & Setup Guidance

Mount the BMXP3420102 on a Modicon M340 rack using the internal power supply from the rack. The module occupies one slot and supports up to 4 racks with 11 slots total. For serial communication, use shielded twisted-pair cables: RS232C requires two pairs, RS485 uses one pair. Keep non-isolated serial segment lengths under 10 m to maintain signal integrity. For CANopen, select the transmission rate based on total bus length — for example, 500 kbit/s supports up to 100 m, while 125 kbit/s reaches 500 m. Insert the supplied BMXRMS008MP memory card for backup of programs and constants before commissioning.

Maintenance & Reliability

The BMXP3420102 operates in ambient temperatures from 32 to 140 °F (0 to 60 °C) and relative humidity up to 95% without condensation, making it suitable for industrial environments without climate control. Its IP20 protection rating requires installation in an enclosure to prevent dust ingress. The module includes diagnostic counters for Modbus and event counters, allowing predictive maintenance by monitoring communication errors. Status LEDs for RUN, I/O fault, CAN ERR, and memory card fault provide immediate visual feedback during troubleshooting. Periodic inspection of the memory card and serial connectors is recommended to ensure reliable operation over the long term.

Compatibility & Integration

The BMXP3420102 integrates seamlessly with the Modicon M340 platform, supporting up to two Ethernet communication modules and four AS-Interface modules for additional fieldbus connectivity. Embedded CANopen services include network management (NMT), Process Data Object (PDO), Service Data Object (SDO), and special functions like SYNC and EMCY. The processor can act as a Modbus master or slave on its serial links, communicating with up to 248 addresses in character mode or Modbus mode. For point-to-point connections, it supports two devices in either character or Modbus mode, with cable lengths up to 15 m. This flexibility allows the BMXP3420102 to serve as a central controller in mixed-protocol environments.