The FX5U-80MR/ES is Mitsubishi Electric’s 80-point relay output compact programmable controller from the MELSEC iQ-F FX5U series — the highest I/O count base unit in the FX5U range, providing 40 digital inputs and 40 relay contact outputs in a single base unit with built-in Ethernet, RS-485, and USB programming interfaces, designed for standalone machine control and multi-axis coordinated automation where the maximum built-in I/O capacity of the FX5U platform is required without the additional cost of separate extension modules. The FX5U-80MR/ES is available through Atlantech Drives — quote within 24-48 hours, worldwide express shipping, 12-month warranty.
What Is the FX5U-80MR/ES?
The FX5U-80MR/ES is the largest-capacity base unit in Mitsubishi Electric’s MELSEC iQ-F FX5U compact PLC series, providing 40 digital inputs (24 VDC sink/source) and 40 relay contact outputs (240 VAC / 30 VDC, 2 A per contact) in a single housing. The «/ES» suffix identifies the 200–240 VAC power supply variant — the FX5U power supply accepts 100–240 VAC input and provides the 24 VDC sensor supply and 5 VDC internal bus power internally. The «80» indicates the total built-in I/O count (40 inputs + 40 outputs = 80 points). The relay output type («MR») provides AC and DC load switching capability directly from the output terminals without transistor output’s voltage class constraints — the relay contacts switch loads at up to 240 VAC or 30 VDC regardless of the load’s polarity, making the FX5U-80MR/ES suitable for direct contactor coil, solenoid valve, and indicator lamp control without external interface relays. The FX5U-80MR/ES includes the full FX5U integrated communication suite as standard: built-in 100BASE-TX Ethernet port for GX Works3 programming, GOT HMI connection, and SCADA MC protocol communication; built-in RS-485 port for Modbus RTU master/slave and FX series multi-drop communication; and USB Type-B port for direct GX Works3 programming connection. The built-in high-speed counter function (6 channels, up to 200 kHz per channel) and positioning pulse output (4 axes, up to 200 kHz) are retained in the 80-point model, enabling servo axis control from the built-in I/O without additional special function modules.
Key Technical Specifications
- Model: FX5U-80MR/ES
- Total I/O Points: 80 (40 inputs + 40 relay outputs)
- Input Type: 24 VDC sink/source (NPN and PNP compatible)
- Output Type: Relay contact (240 VAC / 30 VDC, 2 A per point)
- Power Supply: 100–240 VAC, 50/60 Hz
- CPU Performance: 34 ns per basic instruction
- Program Memory: 64,000 steps (standard), expandable with SD card
- Built-in Communication: Ethernet 100BASE-TX, RS-485, USB Type-B
- Built-in High-Speed Counters: 6 channels (up to 200 kHz per channel)
- Built-in Positioning Outputs: 4 axes (up to 200 kHz, open collector)
- Extension Modules: Up to 16 extension modules (I/O expansion, special function)
- Operating Temperature: 0°C to 55°C
- Dimensions (W × H × D): 220 mm × 90 mm × 75 mm
- Weight: Approx. 1.05 kg
Typical Industrial Applications
The FX5U-80MR/ES is specified for machine control applications requiring the maximum built-in I/O capacity of the FX5U platform — where 40 digital inputs and 40 relay outputs cover the complete machine I/O requirements without extension modules, simplifying the control panel layout and reducing cost. In automated assembly machines with multiple work stations, the FX5U-80MR/ES manages the combined sensor inputs (part presence, position confirmation, clamp status, safety interlocks) and output actuators (clamp solenoids, transfer cylinders, indicator lamps, contactor coils) across all stations within the 80-point I/O envelope, while the built-in Ethernet connects to a GOT2000 HMI panel for operator interface. Conveyor systems with multiple sensor zones, pneumatic diverters, and motor contactors commonly have I/O requirements in the 60–80 point range that the FX5U-80MR/ES covers without extension modules — the relay output type directly drives conveyor motor contactors and pneumatic solenoid valves at both 24 VDC and 230 VAC without external interface relays. Packaging machine control where the machine’s form-fill-seal, date coding, label application, and product rejection systems require comprehensive digital I/O uses the FX5U-80MR/ES for the complete machine sequence control, with the built-in RS-485 providing Modbus RTU communication to temperature controllers, the Ethernet enabling SCADA production data collection, and the USB port providing maintenance programming access. Water treatment pump stations with multiple pump control sequences, valve position feedback, level sensor inputs, and chemical dosing outputs fall within the 80-point FX5U-80MR/ES I/O envelope, with the built-in Ethernet enabling remote SCADA monitoring from a central control room.
Installation Advice
The FX5U-80MR/ES at 220 mm width is the widest FX5U base unit — verify the control panel’s available DIN rail width accommodates the 220 mm unit width plus a minimum 50 mm clearance on each side for heat dissipation and maintenance access. The relay output contacts on the FX5U-80MR/ES are grouped in common terminal blocks with independent common terminals for each group — plan the output wiring to assign loads at the same voltage to the same output common group, and verify that loads at different voltages (24 VDC solenoids and 230 VAC contactors) are connected to separate common groups with appropriate voltage isolation between terminal blocks. For the built-in Ethernet port, connect to the facility network using a standard Cat5e or Cat6 patch cable — the FX5U’s Ethernet port auto-negotiates 10/100 Mbps and supports auto MDI/MDI-X, eliminating the need for crossover cables. Configure the FX5U-80MR/ES IP address in GX Works3’s system parameter settings (FX5CPU Settings > Ethernet Port) before the initial programming session — the factory default IP address (192.168.3.250) may conflict with existing network devices. For the RS-485 port, set the communication parameters (baud rate, data format, protocol) in GX Works3’s built-in RS-485 port parameters to match the connected Modbus RTU or serial device’s settings — the factory defaults may not match the target device’s baud rate.
Frequently Asked Questions
Q: Can the FX5U-80MR/ES relay outputs switch both AC and DC loads on the same output common group?
A: No — each output common group should be wired to a single voltage level and polarity. Mixing AC and DC loads on the same common terminal creates a safety hazard: if an AC load’s return current flows through the common terminal shared with a DC load, the AC voltage appears on the DC circuit at the common rail, potentially damaging DC devices and creating an electric shock hazard at the DC circuit terminals. Wire separate output common groups for AC loads and DC loads, ensuring electrical isolation between the groups at the terminal block level.
Q: What is the maximum number of FX5U extension modules that can be connected to the FX5U-80MR/ES?
A: The FX5U-80MR/ES supports up to 16 extension modules (I/O expansion modules and special function modules combined) connected via the right-side extension bus. The total I/O point count including all extension modules must not exceed the FX5U platform’s maximum of 512 input/output points. For the 80-point base unit, the maximum additional I/O from 16 extension modules is 432 points (512 − 80 = 432), though the actual number of extension modules is also limited by the 5 VDC bus current capacity of the FX5U power supply — verify the total current consumption of all extension modules against the FX5U-80MR/ES’s internal bus current supply rating.
Q: Does the FX5U-80MR/ES support SSCNET III/H servo network communication for MR-J4-B servo amplifiers?
A: The FX5U-80MR/ES base unit does not include built-in SSCNET III/H — the built-in positioning outputs are open-collector pulse train outputs compatible with MR-J4-A pulse train servo amplifiers, not SSCNET III/H. For SSCNET III/H servo network control from an FX5U system, the FX5-40SSC-S SSCNET III/H adapter module (up to 4 axes) connects to the FX5U extension bus and provides the SSCNET III/H interface for MR-J4-B amplifiers. This is an important distinction from the FX3U-20SSC-H which provided SSCNET III/H for FX3U — the FX5U equivalent is the FX5-40SSC-S.
Do you need more references from this brand? Explore our full catalog of Mitsubishi here: https://atlantechdrives.com/manufacturers/mitsubishi/
