What Is SCADA? Supervisory Control Without Replacing the PLC
SCADA sits above PLCs and RTUs: it acquires field data, alarms operators, and issues supervisory commands across plants and remote assets—without replacing local deterministic control.

Precise motion control in automated manufacturing systems is driven by the MR-J4-20A, a high-performance 1-axis servo amplifier engineered by Mitsubishi Electric. Operating within the 200V class, this unit delivers a rated output of 0.2 kW, rendering it suitable for high-speed, high-accuracy industrial positioning. Built-in features include a sinusoidal wave PWM control system and an integrated dynamic brake, ensuring immediate, controlled deceleration and reliable performance under varying dynamic loads.
The MR-J4-20A utilizes a general-purpose command interface supporting pulse-train and analog inputs for position, speed, and torque control modes. Compatibility with 22-bit high-resolution encoders allows for fine positioning feedback. Integrated safety functions, certified to international functional safety standards, provide safe torque off (STO) capabilities, reducing external circuitry requirements in safety-critical automated layouts.
| Mitsubishi Electric |
| MR-J4-20A |
| MELSERVO-J4 Series |
| General-purpose interface (Pulse/Analog) |
| 0.2 kW |
| 200V |
| 3-phase AC 170 V |
| 1.5 A |
| 3-phase or 1-phase AC 200 V to 240 V, 50 Hz / 60 Hz |
| 1.5 A |
| 1-phase AC 200 V to 240 V, 50 Hz / 60 Hz |
| 0.2 A |
| 30 W |
| Sinusoidal wave PWM control / Current control system |
| Built-in |
| 10 W (Built-in regenerative resistor) |
| DC 24 V (±10%, required current capacity: 0.5 A including CN8 connector signal) |
| 22-bit (4,194,304 pulses/rev) |
| IP20 (Open / Self-cooling) |
| 0 degC to 55 degC (non-freezing) |
| -20 degC to 65 degC (non-freezing) |
| 90% RH or less (non-condensing) |
| 5.9 m/s² (10 Hz to 55 Hz in X, Y, Z directions) |
| Up to 2000 meters above sea level |
| 0.8 kg |
| Connector / Port Type | Function Description |
|---|---|
| I/O signals (Pulse train input, analog commands, limit switches, and control inputs) | |
| Encoder interface connection (High-speed serial feedback communication) | |
| RS-422/RS-485 serial communication port (1:N up to 32 axes) | |
| USB port (Connection to PC for MR Configurator2 diagnostics and parameter setup) | |
| STO (Safe Torque Off) safety function input signals | |
| Main circuit AC power supply terminals | |
| Control circuit AC power supply terminals | |
| Servo motor power output terminals |
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| Country of origin |
United States
|