Mitsubishi Electric FX3GE-40MR/DS MELSEC FX Series Programmable Controller

Description

Managing discrete control and process synchronization, the Mitsubishi Electric FX3GE-40MR/DS programmable logic controller integrates built-in network connectivity and analog processing within a space-saving chassis. This unit expands on the standard FX3G platform by incorporating native Ethernet communication and integrated analog inputs and outputs, eliminating the need for dedicated expansion blocks in small-to-medium automation setups. Configured with a 24VDC power supply, it features 24 digital inputs and 16 relay outputs, offering high-reliability switching and direct load control in challenging electrical environments.

Features

• Embedded Network Interfaces: Built-in Ethernet port (10BASE-T/100BASE-TX) supporting CC-Link Field Network Basic, Modbus/TCP, and MELSOFT connection protocols.
• Integrated Analog I/O: Onboard 2-channel analog input and 1-channel analog output configurable for either voltage (0 to 10 VDC) or current (4 to 20 mA) loops.
• Flexible Input Configuration: 24 digital inputs supporting sink or source wiring layouts with variable response filters.
• Robust Relay Outputs: 16 robust electromagnetic relay outputs capable of switching up to 2A per point for direct control of solenoids, contactors, and auxiliary relays.
• Dual-Bus Architecture: Dual-bus architecture allows simultaneously mounting FX3G/FX3U left-side special adapters and right-side standard expansion blocks.

Applications

• Pumping and Fluid Management: Direct PID feedback loops using built-in analog interfaces to regulate pressure and flow rates.
• Material Conveying Systems: Multi-axis coordination and discrete sorting control utilizing integrated high-speed counters.
• HVAC Control Panels: Interfacing with temperature transmitters and regulating damper actuators via onboard analog outputs.
• Dedicated Packaging Machinery: Compact control of sealing, sorting, and labeling operations with distributed Modbus/TCP communication.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

When migrating from a legacy FX3G-40MR/DS to the FX3GE-40MR/DS, the unit occupies an identical footprint, allowing simple mechanical drop-in. However, engineers must note that the onboard analog channels use fixed special register allocations (D8260 to D8269). If previous builds utilized external FX3U-4AD-ADP or similar adapters, the code must be remapped to point to these native system variables rather than the external bus registers.

Application Pitfalls & Engineering Notes

Unlike AC-powered variants, the DC-powered FX3GE-40MR/DS does not provide an auxiliary 24VDC output terminal for powering external sensors. All field sensors and input loops must be energized by an external, stabilized 24VDC power supply. Ensure the common-mode voltage limit on the analog inputs is strictly maintained; exceeding 15V relative to the system ground will damage the onboard analog-to-digital converter.

Commissioning & Wiring Tips

To configure the built-in Ethernet port, use GX Works2 or GX Works3 software. By default, the Ethernet port resides at IP address 192.168.3.250. When commissioning, make sure the programming PC's subnet mask matches the PLC's default subnet (typically 255.255.255.0). Route analog signal wiring in shielded twisted-pair (STP) lines separated from the AC power lines by at least 100mm to avoid high-frequency electromagnetic noise injection into the 11-bit/12-bit analog conversions.

Installation Guidelines