Why the BMXEIA0100 Matters on the Plant Floor
When a serial link drops on a Modicon M340 or M580 rack, the whole line can stall. The BMXEIA0100 from Schneider Electric solves that problem with one job done well: a single RS232/RS485 serial channel for point-to-point communication. It belongs to the Modicon X80 series, the shared I/O platform for M340 and M580 controllers.
From a maintenance engineer’s view, this module is refreshingly simple. One slot, one channel, no extra configuration layers to fight through during a night-shift callout. You drop it into the X-bus backplane, wire your serial device, and the controller sees it as part of the same platform you already know.
Technical Specifications at a Glance
Serial Communication
The BMXEIA0100 provides one built-in RS232/RS485 port. It supports Modbus RTU, Modbus ASCII, and character mode protocols. Baud rate runs from 0.3 to 19.2 Kbps, which covers the majority of legacy weighbridges, flow computers, and analyzer gateways still in service across oil and gas sites.
Electrical Profile
The module draws 24 V DC through the backplane, consuming 1.7 W with a bus current of 70 mA at 24 V DC. That low draw means you can add it to a populated rack without recalculating the power budget in most cases.
Environmental and Physical
Operating temperature spans 0 °C to +60 °C, with storage from -25 °C to +70 °C. Relative humidity tolerance is 5% to 95% non-condensing, and the protection rating is IP20, so it belongs inside a cabinet. Dimensions are 100 × 28 × 93 mm at 0.15 kg, occupying a single slot on the X-bus backplane.
Where This Module Earns Its Keep
Tank Farm Telemetry
Many tank farms still run Modbus RTU over RS485 to level transmitters and flow computers. The BMXEIA0100 gives an M580 rack a direct serial path to those devices without a protocol converter. That keeps the architecture flat and the troubleshooting path short.
Analyzer and Weighbridge Integration
Gas analyzers and weighbridge terminals often expose only an RS232 port. This module accepts that signal directly, so you avoid a separate gateway box, its power supply, and its own failure points.
Legacy Panel Upgrades
When you migrate an older panel to a Modicon M340 or M580 platform, serial devices rarely disappear overnight. This module lets the new controller keep talking to them while the rest of the site modernizes.
Installation and Setup Notes
Mount the module in any free X-bus slot and confirm the backplane seating is firm before power-up. Keep serial cabling separated from VFD output leads and other high-energy conductors, because induced noise is the most common cause of intermittent serial faults. Verify baud rate, parity, and protocol mode match the field device exactly. Because this is a single-channel module, plan your device mapping before installation so you do not need a second module for a device you could have daisy-chained.
Maintenance and Reliability
Serial modules have no moving parts, so wear is minimal. The practical risks are environmental: dust ingress, cabinet overheating, and loose terminal connections. During routine cabinet inspections, check that ambient temperature stays within the 0 °C to +60 °C operating range and that humidity remains non-condensing. Reseat the module only when the rack is de-energized. If a serial link becomes intermittent, inspect the cable shield and grounding before replacing the module, since the module itself rarely fails first.
Compatibility and Integration
The BMXEIA0100 is part of the Modicon X80 platform, shared between M340 and M580 controllers. It communicates over Modbus RTU, Modbus ASCII, and character mode. When integrating into a larger control network, remember that this module provides a serial interface only. Connecting it to an Ethernet-based plant network may require an external gateway or communication module. Confirm cable types and any gateway requirements with your supplier before ordering.
Selection Checklist Before You Buy
Confirm three things: your controller platform is M340 or M580, your field device uses RS232 or RS485, and your protocol is Modbus RTU, Modbus ASCII, or character mode. If your device needs more than one serial channel, plan for additional modules because this unit provides a single channel. Oil AutoTech stocks industrial automation spares for oil, gas, and process plants, with fast dispatch, worldwide. Contact Oil AutoTech today for pricing and availability.
Frequently Asked Questions
Does the BMXEIA0100 work with both M340 and M580 controllers?
Yes. It belongs to the Modicon X80 platform, which is shared between the M340 and M580 families.
Can I connect RS232 and RS485 devices at the same time?
No. The module provides one serial port, configurable as RS232 or RS485, not both simultaneously.
What is the maximum baud rate?
The supported range is 0.3 to 19.2 Kbps.
How much rack power does it consume?
It draws 1.7 W, with a bus current of 70 mA at 24 V DC from the backplane.
Is this module still in production?
Yes, it is listed as active. Please verify current lifecycle status and availability with Oil AutoTech before ordering.
