The FX5-8EYT/ES is an 8-point transistor source-type digital output extension module from Mitsubishi Electric, designed for use with the MELSEC iQ-F FX5 series of programmable logic controllers. Its compact form factor and direct bus connection to the FX5 CPU make it the standard solution for expanding digital output capacity in space-constrained machine control panels. Atlantech Drives holds stock of the FX5-8EYT/ES. Contact us for fast worldwide delivery and competitive pricing.
What Is the Mitsubishi FX5-8EYT/ES?
The FX5-8EYT/ES is a compact I/O extension module providing 8 transistor source outputs for the MELSEC iQ-F FX5U, FX5UC, and FX5UJ CPU units. The /ES suffix denotes European and international standard compliance (CE marking). Transistor source output means the module sources current to the load — the output common (COM) is connected to the positive supply rail and the load is wired between the output terminal and the negative rail. This output polarity is standard for NPN-input field devices such as solenoid valves with integrated rectifiers, indicator lamps, and PLC-compatible relay modules. The FX5-8EYT/ES connects directly to the right side of the FX5 CPU or a preceding extension module via the integrated expansion connector, with no additional wiring required for the bus interface.
Key Technical Specifications
- Number of output points: 8
- Output type: Transistor, source type
- Rated load voltage: 5–24 V DC
- Maximum load current per point: 0.5 A
- Maximum total load current: 2.0 A (all outputs simultaneously)
- OFF-state leakage current: 0.1 mA max
- Output response time (OFF→ON): 0.2 ms max
- Output response time (ON→OFF): 0.2 ms max
- Protection: Short-circuit protection, overheat protection per output point
- Power supply: Supplied from FX5 CPU expansion bus (no external PSU required)
- Applicable CPU: FX5U, FX5UC, FX5UJ
- Certifications: CE (EN 61131-2)
- Operating temperature: 0 to 55°C
- Dimensions (W × H × D): 40 × 90 × 87 mm
Compatibility & System Integration
The FX5-8EYT/ES connects to any MELSEC iQ-F FX5 CPU — FX5U, FX5UC, and FX5UJ — as well as to other FX5 extension modules in the expansion chain. Up to 8 extension modules can be connected to a single FX5U CPU (subject to power budget), with I/O addresses assigned automatically in sequential order from the CPU’s last built-in output point. In GX Works3, the FX5-8EYT/ES appears automatically in the system configuration tree upon connection and does not require manual parameter configuration for basic I/O use. For high-speed output applications using the FX5’s pulse output function (for stepper or servo pulse trains), note that high-speed outputs are only available on the CPU’s built-in transistor outputs — the FX5-8EYT/ES provides standard-speed outputs only and is not suitable for pulse train generation. When mixing the FX5-8EYT/ES (source type) with sink-type input modules in the same panel, verify field device compatibility: source outputs drive NPN-input devices, and polarity mismatches are a common wiring error during commissioning.
Installation Advice
When connecting the FX5-8EYT/ES, ensure the CPU and all extension modules are powered down before attaching or detaching the expansion connector — hot-plugging the expansion bus can damage the bus interface circuitry. Secure the module to the DIN rail before connecting field wiring to the removable terminal block; attempting to install on a DIN rail with a wired terminal block already attached risks mechanical stress on the PCB connector. For inductive DC loads such as solenoid valves, install a flyback diode in parallel with each load (cathode toward the positive supply) to suppress voltage spikes that can exceed the transistor output’s maximum voltage rating. The total output current budget of 2.0 A across all 8 points must be respected — if all 8 outputs are active simultaneously with 0.5 A loads, the module is at its thermal limit. For high-density applications with many simultaneously active outputs, derate total load current to 1.6 A to maintain thermal headroom at elevated ambient temperatures above 40°C.
Frequently Asked Questions
Q: What is the difference between FX5-8EYT/ES and FX5-8EYT/ESS?
A: The FX5-8EYT/ESS is a high-speed variant providing output response times of 5 µs (versus 0.2 ms on the standard FX5-8EYT/ES) and is capable of pulse train output for positioning control. Choose the /ESS variant when the extension module outputs must drive stepper drives or when sub-millisecond switching is required. For standard on/off control of solenoids, lamps, and relays, the FX5-8EYT/ES is the correct and more cost-effective choice.
Q: Can the FX5-8EYT/ES be used with an FX3U CPU?
A: No. FX5 extension modules use a different expansion bus connector and protocol that is incompatible with FX3U and earlier FX series CPUs. For FX3U output expansion, use FX3U-series extension blocks such as the FX3U-8EYT.
Q: Is an external 24V DC power supply required for the FX5-8EYT/ES?
A: No external supply is required for the module itself — it draws power from the FX5 CPU expansion bus. However, the load supply voltage (5–24 V DC) for the output circuits must be provided externally and connected to the module’s COM terminal.
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