Schneider Electric BMXNOM0200 — M340 Serial Module Buying Guide

By Abdullah Zahid
14 min read
Schneider Electric BMXNOM0200 serial link module with 2 RS-485/232 ports for Modicon X80 M340 PLC rack installation

Schneider Electric BMXNOM0200 Serial Link Module with 2 RS-485/232 Ports in Modbus and Character Mode (Modicon X80) — Specs, Price & Selection Guide

If you are specifying serial communication for a Schneider M340 platform and need to integrate legacy RS-485 or RS-232 devices running Modbus RTU or character mode protocols, the Schneider Electric BMXNOM0200 is the dedicated solution within the Modicon X80 module family. This single-slot communication module adds two independent serial ports to the M340 rack, draws only 80 mA at 24V DC, and supports both Modbus RTU and character mode on the same unit — reducing module count and rack space in legacy integration projects. If you have already confirmed it is the right part for your system, check current pricing and availability for the BMXNOM0200 at LeadTime.ca — ships worldwide.

Who Should Buy the BMXNOM0200 — and Who Shouldn't

The BMXNOM0200 is the correct choice when all of the following apply to your project:

  • Your host PLC is confirmed as a Schneider M340 or Modicon X80 compatible platform — this module does not fit Siemens, Rockwell, or other rack architectures
  • Your application requires RS-485 multi-drop or RS-232 point-to-point serial communication, not Ethernet
  • Legacy field devices communicate via Modbus RTU, Modbus ASCII, or character mode — not DNP3, Profibus, or EtherCAT
  • Your site 24V DC auxiliary supply has at least 80 mA of spare capacity after existing module loads
  • At least one standard-format slot is physically available in the M340 rack
  • You need both RS-485 and RS-232 ports active, or both Modbus and character mode on the same module

If your application only requires a single serial port, or if your project calls for Ethernet-based communication, a simpler or different module within the Modicon X80 family is likely a better fit — see the variant comparison table below for specific alternatives.

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What the BMXNOM0200 Actually Does in an M340 System

The Schneider Electric BMXNOM0200 is a communication module that plugs into any standard-format slot in a Modicon X80 or M340 rack and extends the PLC's communication capability to include serial fieldbus protocols. The M340 CPU itself does not natively provide RS-485 or RS-232 ports in most configurations, so the BMXNOM0200 fills that gap directly — without requiring an external serial gateway or third-party converter.

The module provides two independently configurable ports. Each port can be set for RS-485 (for multi-drop Modbus networks with multiple slave devices on one cable run) or RS-232 (for point-to-point connections to a single serial device). Protocol selection is per-port: Port 1 can run Modbus RTU while Port 2 operates in character mode, or both can run the same protocol depending on application requirements. This dual-port dual-protocol design is a confirmed advantage over single-protocol alternatives — one BMXNOM0200 handles what would otherwise require two separate modules, which matters in rack-space-constrained M340 configurations.

Compliance certifications include CE, cUL, RoHS, UL 508, and EN/IEC 61131-2, making this module suitable for regulated industries including food and beverage, pharmaceutical, and chemical processing in both North American and European installations. Firmware version V1.60 is the documented current release with an active update history maintained by Schneider Electric.

Where the BMXNOM0200 Sits in Your System Architecture

The BMXNOM0200 occupies a standard-format slot in the M340 rack and bridges the M340 CPU backplane to downstream serial field devices. It draws power internally from the M340 rack supply — no external 24V adapter is needed — while consuming 80 mA at 24V DC from the rack's auxiliary power budget.

  • M340 CPU (master controller) communicates via rack backplane to the BMXNOM0200 in its assigned slot
  • BMXNOM0200 Port 1 connects via shielded twisted-pair RS-485 cable to a multi-drop Modbus RTU network (variable frequency drives, power meters, sensors)
  • BMXNOM0200 Port 2 connects via RS-232 cable to a point-to-point serial device (legacy HMI terminal, serial printer, or character-mode instrument)
  • M340 programming environment (Unity Pro) manages module configuration, Modbus slave addressing, and register mapping from the same project file as all other I/O
  • Downstream serial devices remain physically unchanged — the BMXNOM0200 is the adapter that makes the M340 speak their legacy protocol

Typical Applications and Deployment Scenarios

The most common real-world application for the BMXNOM0200 is a PLC retrofit where a new M340 replaces an older controller but the existing serial field devices — weight scales, tank level sensors, variable frequency drives, or power meters — remain in place. Rather than replacing all field instrumentation simultaneously, the BMXNOM0200 allows the new M340 to communicate with legacy equipment over its existing RS-485 Modbus RTU wiring, preserving capital and reducing commissioning risk.

Water and wastewater treatment facilities running Modbus RTU sensor networks across multiple pump stations are another strong fit. The BMXNOM0200 supports multi-site data collection configurations where remote RTUs communicate over serial modem or radio links back to a central M340, a topology still common at older municipal infrastructure sites.

Food and beverage production lines frequently combine Modbus RTU instruments (flow meters, temperature transmitters) with character-mode devices (serial label printers or older supervisory terminals). The dual-protocol capability of the BMXNOM0200 — Modbus on one port, character mode on the other — directly serves this mixed environment without additional hardware.

Chemical processing and pharmaceutical packaging facilities standardized on Schneider M340 architecture benefit from the module's compliance with UL 508 and EN/IEC 61131-2, supporting both North American and European regulatory requirements on the same hardware.

Application Typical Deployment
PLC retrofit with legacy serial I/O BMXNOM0200 Port 1 (RS-485 Modbus RTU) connects to existing weight scales or tank sensors; M340 replaces old controller
VFD and power meter monitoring Port 1 RS-485 multi-drop network with multiple Modbus RTU slave drives or meters on one cable run
Character-mode HMI or serial printer Port 2 RS-232 point-to-point to legacy supervisory terminal or label printer in food or pharmaceutical line
Multi-site Modbus over serial modem Port 1 RS-232 or RS-485 to serial modem; remote RTU data collected by central M340 over dial-up or radio link
Water and wastewater pump station M340 rack with BMXNOM0200 managing Modbus RTU sensor network across distributed pump station I/O

Purchase-Decision Specs and Variant Comparison

Parameter Value Notes
Supply Voltage 24V DC Supplied internally from M340 rack; no external adapter needed
Current Consumption 80 mA Verify 24V auxiliary PSU has minimum 80 mA headroom
Port Configuration 2 x RS-485/232 Each port independently configurable for RS-485 or RS-232
Communication Protocols Modbus RTU, Character mode Selectable per port; both can be active simultaneously
Module Format Standard (1 slot) Fits standard M340 rack slots; confirm slot availability before ordering
Operating Temperature 0 to 60 degrees C Suitable for typical industrial panel environments
Dimensions 15.8 in L x 11.8 in W x 5.8 in H Verify physical rack clearance
Compliance Standards CE, cUL, RoHS, UL 508, EN/IEC 61131-2 Confirmed for North American and European regulated installations
Firmware Version V1.60 Verify firmware compatibility with your M340 CPU revision before ordering
Host Platform Compatibility Schneider M340 / Modicon X80 Not compatible with Siemens, Rockwell, or other non-Schneider racks

Full technical specifications are available on the product page at LeadTime.ca.

BMXNOM0200 vs Other Modicon X80 Serial Communication Modules

Module Ports Protocols Voltage Current Best Fit
BMXNOM0200 2 (RS-485/232) Modbus RTU + Character mode 24V DC 80 mA Dual-port legacy integration with mixed protocols
BMXNOM0300 2 (RS-485/232) Modbus RTU + Character mode 24V DC 80 mA Higher-specification variant; verify current specs with distributor
BMXNOE0100 1 Modbus RTU only 24V DC 60 mA Single-port Modbus-only applications; lower cost and simpler setup
BMXNOR0200 2 Modbus RTU only 24V DC 90 mA Dual Modbus RTU without character mode requirement

If your application only requires Modbus RTU on a single port, the BMXNOE0100 draws only 60 mA and is a simpler, lower-cost solution. If you need dual Modbus RTU ports without character mode, the BMXNOR0200 is the correct choice. For the BMXNOM0200 specifically — check current availability and pricing at LeadTime.ca before finalizing your bill of materials.

Expert Verdict: Is the BMXNOM0200 Right for Your Project?

The BMXNOM0200 is a proven, field-validated serial communication module for one specific and well-defined scenario: an established Schneider M340 or Modicon X80 system that needs to communicate with legacy RS-485 or RS-232 devices running Modbus RTU or character mode. Systems integrators retrofitting older serial instruments — weight scales, tank sensors, legacy HMI terminals — into new M340-based upgrades will find this module does exactly what is needed without workarounds. The dual-port dual-protocol design is a genuine operational advantage: one BMXNOM0200 handles mixed Modbus RTU and character-mode device populations that would otherwise require two separate modules and two rack slots. The 80 mA current draw at 24V DC is confirmed to be lower than comparable single-protocol alternatives, which simplifies power supply sizing in congested enclosures. Compliance with CE, cUL, RoHS, UL 508, and EN/IEC 61131-2 means this module satisfies regulatory requirements across food, pharmaceutical, water treatment, and chemical processing environments in both North America and Europe without additional certification work.

The BMXNOM0200 is the wrong choice in several clear situations. If your project requires Ethernet-based communication, a different module family is appropriate and will typically offer lower cost and simpler configuration for new designs. If your application genuinely needs only a single serial port, the BMXNOE0100 (60 mA, single-port Modbus RTU) is a more economical and straightforward fit. If you need dual Modbus RTU ports with no character mode requirement, the BMXNOR0200 (90 mA, dual Modbus RTU) is the correct selection. Most critically, do not order the BMXNOM0200 if your M340 platform choice is not yet finalized — this module does not function in any non-Schneider rack architecture, and ordering it speculatively creates return logistics risk with no technical upside.

From a procurement standpoint, the BMXNOM0200 is not a commodity item stocked in the same depth as M340 CPU modules. Plan for 2 to 3 weeks lead time for North American delivery unless your distributor maintains dedicated shelf inventory. The two pre-order checks that prevent the majority of post-purchase problems are straightforward: confirm at least one standard-format slot is free in the M340 rack, and verify your 24V auxiliary power supply has a minimum of 80 mA of headroom after all existing module loads. If either is uncertain before your purchase order is submitted, it is worth a brief consultation with a specialist distributor rather than discovering the constraint during commissioning. View current pricing and stock status for the BMXNOM0200 at LeadTime.ca — available to buyers worldwide.

For volume pricing, project-level BOM support, or to confirm lead time before committing to a build schedule, contact the LeadTime.ca team directly — we ship worldwide.

What Engineers Need to Know Before Ordering the BMXNOM0200

Community discussion for this specific model is limited in open automation forums — a pattern that typically indicates either a stable, widely-deployed design with few recurring support issues, or a module with a narrower installation base compared to high-volume CPU or I/O modules. What that means practically is that when you have a configuration question or a compatibility concern about the BMXNOM0200, you are unlikely to find a direct forum thread with your exact scenario already answered. Consulting a specialist distributor becomes the faster path to a reliable answer than searching PLC forums.

The most consequential ordering mistakes for this module are well-documented in Schneider's own technical materials and in distributor experience. The single most common error is ordering the BMXNOM0200 for a non-M340 host platform — engineers who have recently worked on Siemens S7 or Rockwell CompactLogix projects sometimes assume serial communication modules transfer between platforms. They do not. The BMXNOM0200 is mechanically and electrically specific to the Schneider M340 and Modicon X80 rack format. The second most disruptive mistake is 24V DC power budget oversight: an 80 mA module sounds trivial, but a 24V auxiliary supply already running at capacity will cause intermittent module resets and erratic Modbus communication that is genuinely difficult to diagnose on a live production line. The third recurring issue is RS-485 cable and termination practice — using unshielded or non-twisted cable in a multi-drop Modbus network generates signal reflections and CRC errors that are consistently misattributed to firmware problems before the physical layer is inspected.

The firmware compatibility dimension is also worth flagging before purchase. Firmware version V1.60 is the current documented release, but compatibility between module firmware and your specific M340 CPU revision needs to be verified against Schneider's firmware compatibility matrix before the order is placed — not during commissioning. A specialist distributor with active Schneider authorization can confirm this in a single support call and can also advise on whether current inventory matches the firmware version you need, which is not always visible on generic online retailer listings.

Wiring and Installation Overview

The following covers key requirements for installing the BMXNOM0200 in an M340 rack and connecting serial field devices. For full wiring diagrams and step-by-step commissioning procedures, refer to the Schneider Electric BMXNOM0200 installation manual and Unity Pro configuration documentation.

  • Power down the M340 rack completely and verify 24V auxiliary supply has minimum 80 mA headroom before inserting the module into any standard-format slot
  • For RS-485 multi-drop networks: use shielded twisted-pair cable rated for 120-ohm impedance; install 120-ohm termination resistors at both physical ends of the RS-485 segment; ground the cable shield at one end only to avoid ground loops
  • For RS-232 point-to-point connections: connect device TX to module RX and device RX to module TX; verify whether a null-modem adapter is required based on the DTE/DCE role of your connected device
  • In Unity Pro, add the BMXNOM0200 to the virtual rack at the correct slot position and configure each port's protocol (Modbus RTU or character mode), baud rate, parity, stop bits, and data bits to match the legacy device settings exactly before applying power
  • After commissioning, verify port activity LEDs on the module are indicating traffic and confirm Modbus transmit/receive counters are incrementing in the module diagnostics before declaring communication successful

Wrong-Part Prevention Checklist

Before submitting a purchase order for the BMXNOM0200, verify each of the following points. These checks address the most common causes of post-purchase returns, commissioning delays, and compatibility failures.

  1. Confirm host PLC is Schneider M340 or Modicon X80 (not Siemens S7, Rockwell CompactLogix, or other brands)
  2. Verify serial port type required: RS-485 for multi-drop networks; RS-232 for point-to-point (BMXNOM0200 supports both)
  3. Check fieldbus protocol: Modbus RTU, Modbus ASCII, or character mode (not DNP3, Profibus, or EtherCAT)
  4. Confirm 24V DC auxiliary power supply is installed and has minimum 80mA headroom per search results
  5. Verify M340 rack has available module slot (standard format modules require one slot each)
  6. Check firmware version compatibility (V1.60 referenced in manufacturer documentation; verify before ordering)

If any item on this checklist is unresolved, contact the LeadTime.ca technical team before ordering — confirming these points takes minutes and prevents weeks of return logistics.

Frequently Asked Questions

Can both ports on the BMXNOM0200 be active at the same time, and can they run different protocols simultaneously?

Yes. The BMXNOM0200 provides two independently configurable ports, and both can be active simultaneously. Port 1 can be configured for Modbus RTU while Port 2 operates in character mode — or both ports can run the same protocol depending on your application. Protocol selection, baud rate, parity, and data bits are set independently per port in Unity Pro during module configuration.

Is the BMXNOM0200 compatible with my specific M340 CPU revision, and does firmware version matter?

Firmware version V1.60 is the current documented release for the BMXNOM0200, and Schneider Electric maintains a firmware compatibility matrix that cross-references module firmware with M340 CPU revisions. This compatibility check must be performed before ordering — not during commissioning. Contact an authorized Schneider distributor or reference Schneider's firmware documentation page for your specific CPU revision number.

What happens to my 24V auxiliary power supply budget when I add the BMXNOM0200 to an existing M340 rack?

The BMXNOM0200 draws 80 mA at 24V DC from the M340 rack's internal supply. If your existing 24V auxiliary PSU is already near capacity with CPU, I/O, and other communication modules, adding 80 mA without headroom will cause intermittent module resets and erratic Modbus communication. Calculate the total 24V load across all installed modules, add 80 mA for the BMXNOM0200, and verify at least 20% total headroom remains on the PSU rating before ordering.

Can I use the BMXNOM0200 to replace a serial gateway or third-party RS-485 to Ethernet converter already in my M340 system?

The BMXNOM0200 is a rack-resident serial communication module, not an external gateway. If your current architecture uses a standalone RS-485 to Ethernet converter between field devices and the M340, replacing it with a BMXNOM0200 changes the physical architecture — the serial ports move inside the M340 rack and communicate via the backplane instead of over Ethernet. Whether this is an improvement depends on your network design; consult your system documentation and verify that Modbus RTU or character mode is the correct protocol path before making the change.

What is the typical lead time for the BMXNOM0200, and is it stocked for fast delivery?

The BMXNOM0200 is not stocked at the same depth as high-volume M340 CPU modules. Plan for approximately 2 to 3 weeks lead time for North American delivery unless your distributor maintains dedicated inventory. Pricing and current stock status are available on the BMXNOM0200 product page at LeadTime.ca, and the team can confirm exact lead time for your region before you commit to a build schedule.

Does the BMXNOM0200 require any external 24V DC power supply wiring, or does the M340 rack supply everything?

The BMXNOM0200 draws its 80 mA operating current internally from the M340 rack supply — no separate external 24V DC adapter or wiring to the module itself is required. The relevant power consideration is ensuring the M340's existing 24V auxiliary power supply budget has sufficient headroom to accommodate the additional 80 mA load from this module.

Why Order the BMXNOM0200 From LeadTime.ca

  • Authorized distribution with access to current Schneider Electric firmware-matched inventory — not surplus or end-of-line stock
  • Global shipping to buyers in any country; no geographic restrictions on orders
  • Technical pre-sale support for firmware compatibility, rack slot, and power budget verification questions before your order is placed
  • Volume pricing available for project-level BOM quantities — contact the team for a quote
  • Current pricing and live stock status visible directly on the BMXNOM0200 product page

BMXNOM0200 At-a-Glance Summary

  • Module: Schneider Electric BMXNOM0200 — Serial Link Module with 2 RS-485/232 Ports, Modicon X80 family
  • Two independently configurable RS-485 or RS-232 ports on a single standard-format M340 rack slot
  • Supports Modbus RTU and character mode simultaneously across the two ports
  • 80 mA current draw at 24V DC — powered internally from M340 rack supply, no external adapter
  • Operating temperature range: 0 to 60 degrees C
  • Compliant with CE, cUL, RoHS, UL 508, and EN/IEC 61131-2 for North American and European regulated environments
  • Current firmware: V1.60 — verify compatibility with your M340 CPU revision before ordering
  • Not compatible with Siemens, Rockwell, or any non-Schneider rack architecture
  • Plan 2 to 3 weeks lead time for North American delivery unless distributor holds dedicated stock
  • Pricing available on the product page at LeadTime.ca — ships worldwide

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