Why the BMXP3420302 Belongs in Your Modicon M340 Architecture
Engineers who specify the Schneider BMXP3420302 are not simply buying a processor module. They are choosing a controller that balances multi-rack I/O capacity, embedded CANopen and Ethernet networking, and a compact footprint. This processor sits at the heart of the Modicon M340 automation platform, and it handles demanding discrete and analog control tasks without forcing a platform migration.
What This Processor Module Delivers
The BMXP3420302 is a processor module for the Modicon M340 automation platform. It supports up to 4 racks and 11 slots, giving you room to distribute I/O across a machine or process line. The module accepts a supplied memory card (BMXRMS008MP) for backup of programs, constants, symbols, and data, and it also activates a standard web server, class B10.
Key Technical Parameters That Matter
I/O Capacity
Discrete I/O processor capacity reaches 1024 I/O in a multi-rack configuration and 704 I/O in a single-rack configuration. Analog I/O capacity reaches 256 I/O multi-rack and 66 I/O single-rack. The processor also supports 36 application specific channels.
Memory and Execution
Internal RAM totals 4096 kB, split into 256 kB data and 3584 kB program constants and symbols. Execution time per instruction is 0.12 µs Boolean, 0.17 µs double-length words, 0.25 µs single-length words, and 1.16 µs floating points. Throughput reaches 6.4 Kinst/ms for mixed Boolean and fixed arithmetic, and 8.1 Kinst/ms for 100% Boolean.
Communications
Integrated connections include a USB port at 12 Mbit/s, a CANopen master bus on SUB-D 9 with two twisted shielded pairs, and an Ethernet TCP/IP RJ45 port on one twisted pair at 10/100 Mbit/s. The processor supports 2 Ethernet communication modules and 4 AS-Interface modules. Embedded services cover CANopen NMT, PDO, SDO, SYNC, EMCY, and TIME, plus Ethernet bandwidth management, Data Editor, Modbus TCP messaging, Rack Viewer, and SNMP network administration.
Power and Physical
Current consumption is 135 mA at 24 V DC, with internal power supply via rack. Net weight is 0.215 kg (0.474 lb). Operating ambient air temperature ranges from 0…60 °C (32…140 °F), and relative humidity is 10…95 % without condensation. IP degree of protection is IP20.
Where This Module Fits
Discrete Manufacturing Cells
A multi-rack configuration with up to 1024 discrete I/O suits assembly cells that combine sensors, actuators, and safety interlocks. The CANopen master bus links drives and remote I/O over distances defined by the selected transmission rate.
Process Skids with Analog Loops
With 256 analog I/O in multi-rack mode and programmable loops, this processor handles temperature, pressure, and flow control on packaged skids. Ethernet TCP/IP and Modbus TCP messaging let the skid report to a supervisory system.
Upgrade Path from Older Controllers
Plants replacing legacy processors can consolidate control into a Modicon M340 platform. The BMXP3420302 supports 4 racks and 11 slots, so existing I/O can often be redistributed rather than replaced. Confirm rack and module compatibility before committing to a migration plan.
Installation and Setup Notes
Mount the processor in a Modicon M340 rack and confirm the rack provides internal power. Wire the CANopen master bus using SUB-D 9 connectors and two twisted shielded pairs. Respect the transmission rate versus distance limits: 1 Mbit/s reaches 20 m, 500 kbit/s reaches 100 m, 250 kbit/s reaches 250 m, 125 kbit/s reaches 500 m, 50 kbit/s reaches 1000 m, and 20 kbit/s reaches 2500 m. For Ethernet, use the RJ45 port at 10/100 Mbit/s. Verify the supplied memory card is seated before power-up.
Maintenance and Reliability
Check the status LEDs regularly. Green LEDs indicate Ethernet activity, CAN operational state, processor running, and Ethernet status. Red LEDs flag I/O module faults, CAN errors, memory card faults, and processor or system faults. A yellow LED shows Modbus activity. Inspect the enclosure for dust buildup that could restrict airflow, and keep ambient temperature within 0…60 °C. Relative humidity must stay between 10 % and 95 % without condensation. The processor carries CE, UL, CSA, RCM, EAC, and Merchant Navy certifications, and it meets EN 61131-2 and related standards. For hazardous locations, the module is rated for class I division 2.
Compatibility and Integration
The processor integrates with the Modicon M340 automation platform. It supports CANopen DS 301 V4.02, DS 303-2, and DS 405 devices linked by daisy-chaining or tap junctions using CSMA/CA. Up to 63 CANopen server devices are supported. Ethernet services include Modbus TCP messaging, SNMP, and a standard web server. The processor also supports 2 Ethernet communication modules and 4 AS-Interface modules.
Selection Checklist Before You Buy
Confirm your rack count and slot requirements. Verify the discrete and analog I/O counts match your application. Check that your network uses CANopen or Ethernet TCP/IP. Confirm the 24 V DC current draw of 135 mA fits your power budget. If you need a memory card, verify the BMXRMS008MP is included or available. SpareTechPLC can help you confirm availability and lifecycle status before ordering.
Frequently Asked Questions
What is the maximum discrete I/O capacity of the BMXP3420302?
It supports 1024 I/O in a multi-rack configuration and 704 I/O in a single-rack configuration.
How many racks and slots does this processor support?
It supports 4 racks and 11 slots.
What communication interfaces are integrated?
It includes a USB port at 12 Mbit/s, a CANopen master bus on SUB-D 9, and an Ethernet TCP/IP RJ45 port at 10/100 Mbit/s.
What is the current consumption?
The processor draws 135 mA at 24 V DC.
What is the operating temperature range?
It operates from 0…60 °C (32…140 °F) with relative humidity of 10…95 % without condensation.
