Purchase now the Mitsubishi FX2N-48ER-ES/UL — the 48-point I/O extension block with relay output for the FX2N programmable logic controller series.
What Is the Mitsubishi FX2N-48ER-ES/UL?
The FX2N-48ER-ES/UL is an extension block manufactured by Mitsubishi Electric for the FX2N PLC series. It provides 24 additional inputs and 24 relay outputs, expanding the I/O capacity of an FX2N base unit without requiring a separate power supply. The ES/UL suffix indicates compliance with both European (CE) and North American (UL) safety standards, making this unit suitable for international machine builds. Relay output type makes it ideal for applications requiring switching of AC or DC loads at moderate switching frequencies.
Key Technical Specifications
- Total I/O points: 48 (24 inputs + 24 outputs)
- Input voltage: 24V DC (source/sink compatible)
- Output type: Relay (dry contact)
- Output voltage range: 2–240V AC / 2–30V DC
- Output current per point: 2A (resistive load)
- Common terminal configuration: 8-point commons
- Power supply: Supplied by FX2N base unit (no separate PSU required)
- Certifications: CE, UL
- Dimensions: 220 × 90 × 87 mm (W × H × D)
- Weight: Approx. 0.7 kg
Compatible Base Units
The FX2N-48ER-ES/UL is compatible with the following Mitsubishi FX2N base units:
- FX2N-16M□, FX2N-32M□, FX2N-48M□, FX2N-64M□, FX2N-80M□, FX2N-128M□
- FX2NC series (with FX2NC-CNV-IF converter)
A maximum of 8 extension blocks/modules can be connected to a single FX2N base unit, subject to total I/O point limits (256 max).
Installation Advice
Connect the FX2N-48ER-ES/UL directly to the expansion connector on the right side of the FX2N base unit or the previous extension block using the dedicated flat cable and expansion connector — never force-fit connectors as the edge connector is fragile. Assign I/O addresses sequentially starting from the next available point after the base unit’s built-in I/O; address assignment is automatic in FX2N systems. For relay output wiring, always observe the 8-point common groupings — mixing AC and DC loads within the same 8-point common block is not recommended and may cause ground loop issues. Install a varistor or RC snubber circuit across inductive AC loads (contactors, solenoids) to suppress voltage spikes that accelerate relay contact wear.
Expert Tips
- Relay outputs on this unit have a mechanical life of approximately 10 million operations and an electrical life of 100,000 operations at rated load. For high-frequency switching (more than 1 operation per second continuously), consider transitioning to a transistor output extension block such as the FX2N-48ET to extend service life.
- When replacing a faulty FX2N-48ER-ES/UL in a live panel, document all wiring terminal connections photographically before removal — the 48-point terminal layout is dense and rewiring errors are common.
- If the FX2N base unit reports an I/O bus error after adding this extension, check that the flat cable is fully seated and that total system I/O does not exceed the FX2N’s 256-point hardware limit.
Frequently Asked Questions
Q: Is the FX2N-48ER-ES/UL compatible with the FX3U or FX3G PLC series?
A: No. FX2N extension blocks use a different expansion bus and connector standard compared to the FX3U and FX3G families. For FX3U systems, use FX3U-series extension blocks (e.g., FX3U-48ER).
Q: What is the difference between FX2N-48ER and FX2N-48ER-ES/UL?
A: The base FX2N-48ER is the standard domestic (Japan) version. The ES/UL variant adds CE and UL certifications for international markets and may include minor wiring terminal differences. Functionally they are identical.
Q: Can I mix relay and transistor extension blocks on the same FX2N base unit?
A: Yes. The FX2N system allows mixing of different output type extension blocks on the same base unit, provided total I/O point limits are respected.
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