Why the BMXXBC050K Belongs in Your Spares Cabinet
When an M340 or M580 rack needs to grow, the weakest link is often the cable between racks. The Schneider Electric BMXXBC050K is a Modicon X80 X-bus expansion cable built for exactly that job: daisy-chaining multiple racks over a 5.0 m run with 9-pin SUB-D connectors. It is the practical answer for engineers who need to extend I/O without redesigning the architecture.
Because the X80 platform is shared across M340 and M580 controllers, this cable serves two generations of systems. That single fact makes it a smart spare to keep on the shelf. Fast dispatch, worldwide, means you are not waiting weeks when a line is down.
Technical Specifications That Matter
5.0 m Length
The BMXXBC050K gives you 5.0 m of reach between racks. In a typical panel, that is enough to bridge adjacent cabinets or span a short cable tray run without adding a repeater. Plan the route before you order, and remember the X-bus total length must not exceed 30 m across the whole daisy chain.
9-Pin SUB-D Connectors
The 9-pin SUB-D interface is the standard X80 rack connection. It seats positively and resists vibration better than loose terminal wiring. Inspect the pins during any cabinet maintenance, and keep the connector shells clean and dry.
Daisy-Chain Architecture
The cable links racks in series, so each rack in the chain passes the bus onward. This keeps wiring simple and predictable. If you add a rack later, you extend the chain rather than re-route every cable.
Where This Cable Earns Its Place
In oil and gas terminals, M580 racks often sit in separate enclosures for segregation. The BMXXBC050K bridges them cleanly. In water treatment or packaging lines, M340 racks expand as I/O grows, and this cable handles the jump between cabinets. For any retrofit where a rack must move a few meters, it is the low-risk choice.
Integration and Selection Advice
Confirm your rack model and existing X-bus cabling before ordering. The 5.0 m length suits most panel-to-panel runs, but measure first. If you are unsure which cable fits your M340 or M580 layout, our team offers hands-on technical selection help. Contact Oil AutoTech today for pricing and availability.
Reliability and Lifecycle
This cable is an active part of the shared X80 I/O platform, last verified in September 2026. Treat it as a wear item: inspect connectors at scheduled shutdowns, avoid sharp bends, and keep spare units on hand. That approach protects uptime far better than reactive ordering.
Frequently Asked Questions
What does the BMXXBC050K connect?
It connects Modicon X80 racks in a daisy-chain X-bus configuration using 9-pin SUB-D connectors.
How long can the total X-bus be?
The X-bus total length must not exceed 30 m, including this 5.0 m cable.
Is it compatible with both M340 and M580?
Yes. The X80 platform is shared across M340 and M580 controllers.
Can I use it to extend an existing chain?
Yes, it is designed for daisy-chain expansion between multiple racks.
Is this part currently active?
Yes, lifecycle status is active as of September 2026. Verify availability with Oil AutoTech before ordering.
