The FX2N-CNV-BC is Mitsubishi Electric’s conversion block adapter for the MELSEC FX2N compact PLC series, enabling FX0N series extension modules (FX0N-8ER, FX0N-16EX, FX0N-8EYR, etc.) to be connected to FX2N base units — providing backward compatibility with the earlier FX0N extension hardware in FX2N systems where existing FX0N I/O modules must be integrated or reused without replacement. As a passive mechanical and electrical interface adapter, the FX2N-CNV-BC bridges the physical connector difference between the FX2N extension bus and the FX0N module connector without modifying the electrical signals, enabling FX0N extension modules to operate correctly in the FX2N extension chain. The FX2N-CNV-BC is available through Atlantech Drives — quote within 24-48 hours, worldwide express shipping, 12-month warranty.
What Is the FX2N-CNV-BC?
The FX2N-CNV-BC is a passive conversion block that adapts the FX2N base unit’s extension bus connector format to the FX0N extension module connector format. The FX2N and FX0N series use compatible electrical bus signals but physically different extension connectors — the FX2N extension bus uses a specific edge connector and cable format that is not directly compatible with the FX0N module’s connection terminal. The FX2N-CNV-BC provides the mechanical adapter between these two connector types, allowing FX0N extension I/O modules to be inserted into the FX2N extension chain via the FX2N-CNV-BC as if they were standard FX2N extension modules. The adapter connects to the FX2N base unit’s extension bus (or to the preceding module’s extension output connector) using the standard FX2N extension cable, and presents the FX0N module connector at its output. FX0N extension modules inserted into the FX2N-CNV-BC are assigned I/O addresses by the FX2N system in the normal sequential manner, appearing identically to native FX2N extension modules from the FX2N CPU’s perspective. The FX2N-CNV-BC does not modify any electrical signals — it is a purely mechanical interface adapter.
Key Technical Specifications
- Model: FX2N-CNV-BC
- Function: FX0N-to-FX2N extension bus mechanical conversion adapter
- Input Side Connector: FX2N extension bus (cable connection from FX2N base unit or preceding module)
- Output Side Connector: FX0N extension module connector
- Compatible FX0N Modules: FX0N-8ER, FX0N-16EX, FX0N-8EYR, FX0N-8EYT, and other FX0N extension I/O units
- Electrical Modification: None (passive mechanical adapter)
- Power Supply: Passed through from FX2N extension bus (no separate supply)
- Operating Temperature: 0°C to 55°C
- Dimensions: Small adapter block, fits between FX2N extension cable and FX0N module
- Weight: Approx. 0.05 kg
Typical Industrial Applications
The FX2N-CNV-BC is deployed almost exclusively in retrofit and upgrade scenarios where an FX2N base unit is being introduced into an installation that previously used FX0N hardware, or where FX0N extension modules from an existing FX0N system are being incorporated into a new FX2N-based machine to preserve the field wiring and I/O infrastructure investment. In maintenance replacement projects where an FX0N base unit has failed and is replaced with an FX2N base unit (due to FX0N unavailability), the FX2N-CNV-BC enables the existing FX0N extension I/O modules to continue operating with the new FX2N base unit without replacing the entire I/O infrastructure. This scenario is particularly common in small machine retrofit projects where the FX0N base unit is the failed component but the FX0N extension modules and their connected field wiring are in good condition — replacing only the base unit via FX2N + FX2N-CNV-BC + existing FX0N extension modules minimises downtime and costs compared to replacing the entire I/O infrastructure. In older packaging and food processing facilities where FX0N-based machines have been in service for 15–20 years, the FX2N-CNV-BC provides a cost-effective incremental upgrade path — the FX2N base unit’s superior processing speed, larger memory, and expanded communication options improve machine performance while the proven FX0N field I/O infrastructure remains unchanged.
Replacement & Upgrade Notes
The FX2N-CNV-BC is a discontinued Mitsubishi product, though its function as a passive mechanical adapter means it is rarely the failure point in an FX2N + FX0N extension installation — the adapter has no active electronic components that can fail in service. Sourcing a replacement FX2N-CNV-BC may be necessary when the original adapter is physically damaged (broken connector, cracked housing) from rough handling during maintenance. For facilities planning long-term migration away from FX0N extension hardware, the FX2N-CNV-BC should be considered a transitional component — the FX0N extension modules themselves are discontinued and carry the same sourcing risk as the FX2N platform when requiring maintenance replacement. The strategic upgrade path from FX0N extension modules to current hardware involves replacing both the FX2N-CNV-BC and the FX0N extension modules with native FX2N extension modules (FX2N-16EX for inputs, FX2N-16EYR for relay outputs) or, if the base unit is also being upgraded, with FX3U extension modules (FX3U-16EX, FX3U-16EYR) for the FX3U platform. Note that the FX3U platform provides a different migration path from FX2N — the FX3U-CNV-BD adapter enables FX2N extension I/O modules to connect to FX3U base units, but there is no equivalent adapter for connecting FX0N modules to FX3U base units directly, making the FX0N-to-FX3U upgrade a hardware replacement exercise for the extension modules regardless of the adapter path taken.
Frequently Asked Questions
Q: Can the FX2N-CNV-BC be used with FX3U base units to connect FX0N extension modules?
A: No. The FX2N-CNV-BC adapts the FX2N extension bus connector to the FX0N module connector. The FX3U base unit uses a different extension bus connector than the FX2N — connecting FX2N extension modules to FX3U requires the FX3U-CNV-BD adapter, not the FX2N-CNV-BC. There is no Mitsubishi-supplied adapter for directly connecting FX0N extension modules to FX3U base units. An FX0N-to-FX3U integration would require: FX3U base unit → FX3U-CNV-BD → FX2N-CNV-BC → FX0N module, connecting the adapters in series — verify this multi-adapter chain compatibility with Mitsubishi’s hardware manual before implementing.
Q: Does the FX2N-CNV-BC limit the I/O addressing or the total point count of the FX0N modules connected through it?
A: No. The FX2N-CNV-BC is a passive mechanical adapter with no active components — it passes the extension bus signals unchanged between the FX2N bus and the FX0N module. The FX0N module connected via the FX2N-CNV-BC is assigned I/O addresses by the FX2N system exactly as a native FX2N extension module would be, with no reduction in addressable I/O points, no performance penalty, and no limitation on the module’s I/O data exchange.
Q: Can multiple FX0N extension modules be connected to a single FX2N base unit using multiple FX2N-CNV-BC adapters?
A: Yes, provided the FX0N modules support cascading via their own extension connector — some FX0N extension modules have output extension connectors allowing additional modules to cascade from them. Each FX0N module in the chain requires one FX2N-CNV-BC where the FX2N extension bus cable meets the FX0N connector. The total I/O address count of all FX0N modules connected via FX2N-CNV-BC adapters counts toward the FX2N platform’s 256-point total I/O limit, and the FX2N special function module count limit of 8 applies to any FX2N or FX0N special function modules in the extension chain.
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