Why the BMXP342000 Solves Your M340 Capacity and Communication Problems
When a Modicon M340 system runs out of processing headroom or serial communication ports, production data stalls and troubleshooting time climbs. The BMXP342000 processor module from Schneider Electric addresses both pain points in one unit. It belongs to the Modicon M340 automation platform and installs in a single rack with 11 slots. The module manages up to 1024 discrete I/O in a single-rack configuration and up to 256 analog I/O in a multi-rack configuration. Engineers who need to expand without replacing the entire control cabinet will find this processor a practical upgrade path.
What the BMXP342000 Delivers in Real Installations
Processing Capacity That Handles Mixed Control Tasks
The module executes Boolean instructions in 0.18 µs and floating-point instructions in 1.74 µs. That speed matters when a line combines fast discrete interlocks with slower analog loops. The processor supports 1 cyclic/periodic master task, 1 periodic fast task, and 32 event tasks. A 0.2 ms fast task overhead keeps time-critical routines responsive. For plants running recipe changes or batch logic, the 4096 kB internal RAM splits into 256 kB for data and 3584 kB for program constants and symbols.
Serial and USB Connectivity Without Extra Cards
The BMXP342000 includes non-isolated serial link RJ45 ports for RS232C and RS485 character mode, plus Modbus RTU/ASCII master/slave operation. Data rates range from 0.3 to 19.2 kbit/s. A USB port runs at 12 Mbit/s for local programming and diagnostics. The processor also accepts up to 2 Ethernet communication modules and 4 AS-Interface modules, so you can add plant-floor networks as needs grow. Modbus diagnostics include diagnostic counters and event counters.
Memory and Object Areas for Complex Programs
Object areas support 128 kB of unlocated internal data, 16250 %Mi located internal bits, 32464 %MWi internal words, and 32760 %KWi constant words. Default sizes start smaller, so you can scale memory use as the application matures. A supplied memory card (BMXRMS008MP) backs up programs, constants, symbols, and data.
Where This Processor Fits Best
Water and Wastewater Treatment
A treatment plant often needs many analog inputs for flow, level, and pressure. The BMXP342000 handles up to 256 analog I/O in a multi-rack configuration, which suits distributed pump stations. Modbus RTU over RS485 links the processor to remote I/O and drives. Isolated Modbus segments can reach 0…3280.8 ft (0…1000 m), covering long cable runs across a site.
Manufacturing Cell Retrofits
When a legacy M340 rack needs more discrete points, this processor supports 1024 discrete I/O in a single-rack configuration. The 11-slot rack keeps wiring centralized. Event tasks and the fast task help capture short machine faults that a slower scan would miss.
Building Automation and OEM Panels
OEMs building compact panels benefit from the 0.4 lb (0.2 kg) net weight and IP20 rating. The module runs on 24 V DC with 72 mA current consumption and draws internal power from the rack. That low current draw reduces power supply sizing.
Installation and Setup Guidance
Mount the BMXP342000 in a Modicon M340 rack with up to 11 slots. Confirm the rack supplies internal power, since the module does not use a separate supply. Keep ambient air temperature between 32…140 °F (0…60 °C) and relative humidity between 10…95 % without condensation. Use the five status LEDs to confirm health: green RUN, red I/O fault, red CARD ERR, red ERR, and yellow SER COM activity on Modbus. Follow Schneider Electric’s installation manual for wiring and grounding. Do not modify internal components.
Maintenance and Reliability
Inspect the module and rack connections periodically. Check that the RUN LED stays green and that no fault LEDs remain lit. Verify the memory card seats correctly to avoid CARD ERR events. Keep the enclosure free of dust and moisture, and respect the IP20 rating by installing the module inside a suitable cabinet. The protective treatment is TC, and the module carries CE, UL, CSA, RCM, EAC, and Merchant Navy certifications. It also meets hazardous location Class I Division 2 requirements.
Compatibility and Integration
The BMXP342000 works within the Modicon M340 automation platform. It supports Modbus RTU and ASCII over RS232C and RS485, plus character mode. You can add up to 2 Ethernet communication modules and 4 AS-Interface modules. The processor handles 0…32 devices per segment in character mode and Modbus, and up to 248 Modbus addresses. Point-to-point links reach 0…49.2 ft (0…15 m). These options let you integrate drives, HMIs, and remote I/O without a separate communication processor.
What to Verify Before You Buy
Confirm your rack has an open slot and that your I/O count stays within the 1024 discrete or 256 analog limits. Check that your serial devices match RS232C or RS485 and the 0.3…19.2 kbit/s range. Decide whether you need the supplied memory card (BMXRMS008MP) for backup. If you are replacing a failed processor, note the original part number and firmware needs. SpareTechPLC stocks industrial automation parts and can help you confirm the BMXP342000 fits your M340 system. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Frequently Asked Questions
Can the BMXP342000 replace a failed M340 processor without rewiring?
Yes, if your rack and I/O modules are compatible with the Modicon M340 platform. The module uses the same rack power and 11-slot format. Always confirm your existing configuration before ordering.
How many analog I/O points does this processor support?
It supports up to 256 analog I/O in a multi-rack configuration and 66 analog I/O in a single-rack configuration.
What communication ports come built in?
The module includes non-isolated RS232C and RS485 RJ45 serial links for character mode and Modbus RTU/ASCII, plus a USB port at 12 Mbit/s.
Does the BMXP342000 include a memory card?
Yes, a BMXRMS008MP memory card is supplied for backup of programs, constants, symbols, and data.
What is the operating temperature range?
The module operates from 32…140 °F (0…60 °C) with relative humidity of 10…95 % without condensation.
