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PRODUCT POSITION:HOMEPRODUCT—LD77MS4
LD77MS4
The LD77MS4 is a 4-axis motion control module from Mitsubishi Electric’s MELSEC iQ-L series, designed for high-speed, high-precision positioning in industrial automation. It supports SSCNET III/H communication and integrates seamlessly with MELSEC PLCs for synchronized multi-axis control.
DESCRIBE
Key Features & Specifications
1. Motion Control Performance
Control Axes: 4 axes (independent or synchronized)

Maximum Speed: 4 Mbps (per axis)

Positioning Accuracy: ±1 pulse (with electronic gear compensation)

Interpolation Modes: Linear, circular, helical (2D/3D)

Motion Functions:

Electronic cam

Synchronous start

Override speed control

Torque limit

2. Communication & Connectivity
Primary Interface: SSCNET III/H (fiber optic, 150 Mbps)

PLC Connection: MELSEC iQ-L bus (high-speed internal link)

I/O Signals:

16 dedicated inputs (per axis) (limit switches, home position)

6 dedicated outputs (per axis) (servo ON, alarms)

3. Programming & Configuration
Software: GX Works3 (Motion Control Edition)

Programming Methods:

Motion SFC (Sequential Function Chart)

Motion ladder logic

Dedicated motion instructions

Simulation: Offline trajectory simulation

4. Environmental & Mechanical Ratings
Operating Temperature: 0°C to 55°C (32°F to 131°F)

Storage Temperature: -25°C to 75°C (-13°F to 167°F)

Protection Class: IP20 (requires enclosure)

Vibration Resistance: 5.9 m/s² (10-57Hz)

5. Power & Dimensions
Power Supply: 5V DC (from base unit)

Dimensions: 98 × 90 × 86 mm (W×H×D)

Weight: 0.4 kg

Compatible Servo Systems
✔ MR-J4 series servo amplifiers
✔ HG-KN, HG-SN, HG-RN servo motors

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