Description
Engineered for high-performance automation, the Mitsubishi Electric FX3U-64MT/ES-A functions as a high-speed PLC main unit within the MELSEC FX3U family, integrating 32 digital inputs and 32 transistor outputs. This controller addresses complex machine control applications by combining a highly compact form factor with advanced execution speeds and a 64,000-step program memory. Optimized for positioning and motion control, the unit features built-in high-speed counters and pulse outputs capable of managing multi-axis configurations directly from the base module.
Features
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Dual-Bus Architecture: Enables simultaneous expansion using traditional FX series blocks and high-speed ADP adapters.
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Integrated High-Speed I/O: Features 32 inputs and 32 transistor (Sink) outputs designed for rapid response and pulse train generation.
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Extensive Program Capacity: 64,000 steps of internal RAM/Flash memory to accommodate sophisticated application code and data logging.
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Positioning Capabilities: Built-in 3-axis independent pulse output (up to 100 kHz) for step and servo drive control.
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Communication Interface: Built-in programming port with expansion capacity for RS-232, RS-485, and Ethernet modules.
Applications
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Multi-Axis Packaging Machinery: Synchronized labeling, sorting, and wrapping operations.
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Material Handling Systems: Conveyor control, palletizing, and automated storage/retrieval systems (ASRS).
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Precision Assembly Lines: Pick-and-place indexing tables and pneumatic sequencing networks.
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Pumping and HVAC Control: Complex analog loop integration when paired with dedicated expansion modules.
Technical Specifications
| Parameter |
Specification Value |
| Manufacturer |
Mitsubishi Electric |
| Model Series |
MELSEC FX3U |
| Part Number / SKU |
FX3U-64MT/ES-A |
| Supply Voltage |
100 to 240 V AC (+10% / -15%), 50/60 Hz |
| Power Consumption |
45 W |
| Total Digital I/O Points |
64 points (built-in) |
| Digital Input Specification |
32 points, 24 V DC (Sink or Source selectable) |
| Digital Output Specification |
32 points, Transistor (Sink type) |
| Response Time |
Input: Approx. 10 ms; Output: 0.2 ms or less (for high-speed operations) |
| Built-in Communication Port |
RS-422 (Mini-DIN 8-pin programming interface) |
| Ambient Operating Temperature |
0 to 55 degC |
| Country of Origin |
Japan |
| Shipping Weight (Calculated) |
1.20 kg |
| Package Dimensions (Calculated) |
220 mm x 110 mm x 105 mm |
Connections and Interfaces
| Terminal Group |
Wiring Assignment and Function |
| L, N, PE |
Main AC Power Input (100-240 V AC) and Protective Earth connection. |
| 24+ / S/S |
Auxiliary 24 V DC power supply (output) and input configuration sink/source selector terminal. |
| X0 to X37 |
24 V DC Digital Inputs (X0-X7 support high-speed hardware counter configurations). |
| Y0 to Y37 |
Transistor Output Terminals. Y0, Y1, and Y2 support up to 100 kHz pulse outputs. |
| COM1 to COM5 |
Common reference terminals for transistor outputs (grouped output design). |
Empirical Engineering Insights
Alternative Models & Compatibility
When migrating legacy systems from the FX2N-64MT to the FX3U-64MT/ES-A, review your physical panel footprint. The FX3U incorporates a dual-bus architecture, which increases the physical casing width slightly. Programming code from GX Developer can be automatically ported within GX Works2, though high-speed counter pointer modifications and pulse-output instruction formats must be manually verified to match the FX3U hardware instruction set.
Application Pitfalls & Engineering Notes
Because this unit features Sink transistor outputs (MT/ES-A), the load must be connected between the positive terminal of the power supply and the digital output terminal. Attempting to source current directly from the output pin will damage the internal optical couplers. For inductive loads, such as DC solenoids or auxiliary relays, install an external flyback diode across the load to prevent back-EMF voltage spikes from degrading the output transistors over time.
Commissioning & Wiring Tips
The built-in 24 V DC auxiliary output power terminal on the CPU can support up to 450mA of current. Do not exceed this budget when powering multiple proximity sensors or encoders. For pulse positioning systems, keep the wiring length between the transistor outputs (Y0-Y2) and the motor drive amplifier below 2 meters and utilize shielded twisted-pair cabling to mitigate high-frequency electromagnetic interference.
Installation Guidelines
CRITICAL SAFETY WARNING
Isolate all electrical power sources before attempting terminal connection or module expansion. Double-check that the supply voltage matches the 100-240 V AC designation; applying high voltage to the DC signal terminals will cause immediate component failure and physical hazards.
1
Mount the controller horizontally on standard 35 mm DIN rail or directly to a backplate using structural mounting screws, leaving at least 50 mm of clearance around the top and bottom of the unit for natural convection cooling.
2
Connect the power supply line to the L and N terminals, ensuring the Protective Earth (PE) terminal is tied directly to the system's low-impedance copper ground busbar.
3
Configure the S/S terminal according to your input sensor types: link S/S to 24+ for Sink input configurations, or link S/S to 0V for Source input configurations.
4
Secure all terminal blocks using the integrated screws to a torque of 0.5 to 0.8 N-m to prevent contact degradation under mechanical vibrations.