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.

Operating as a multi-axis drive solution within the MELSERVO-J4 platform, the MR-J4W3-222B servo amplifier provides independent closed-loop control for up to three AC servo motors. Designed to reduce cabinet footprint and simplify wiring complexity, this unit integrates three drive axes into a single physical housing while sharing a common power supply bus.
The MR-J4W3-222B utilizes the SSCNET III/H high-speed optical network interface to achieve synchronous, real-time motion control with minimal transmission delay. This communication protocol ensures high noise immunity and fast cycle times, making the amplifier highly compatible with Mitsubishi motion controllers and Q-Series or iQ-R Series PLC systems. By managing three axes with a single network connection, system integration is significantly streamlined.
| Manufacturer | Mitsubishi Electric |
| Model | MR-J4W3-222B |
| Series | MELSERVO-J4 (MR-J4W-B Multi-Axis) |
| Number of Axes | 3 Axes |
| Rated Output per Axis | 0.2 kW (200 W) per axis (Axis A / Axis B / Axis C) |
| Interface Type | SSCNET III/H (Optical high-speed communication) |
| Control Method | Sine-wave PWM control / Current control system |
| Power Supply Requirements | 3-phase 200 VAC to 240 VAC, 50/60 Hz |
| Ambient Operating Temperature | 0 to 55 degC (non-freezing) |
| Ambient Storage Temperature | -20 to 65 degC (non-freezing) |
| Weight | 2.3 kg |
| Dimensions (W x H x D) | 8.5 cm x 16.8 cm x 19.5 cm |
| Connector / Terminal | Function |
|---|---|
| CN1A / CN1B | SSCNET III/H Optical Cable Ports (Inlet / Outlet) |
| CN2A / CN2B / CN2C | Encoder Inputs (Axis A, Axis B, Axis C) |
| L1, L2, L3 | Main Circuit Power Input (3-phase 200-240 VAC) |
| L11, L21 | Control Circuit Power Input |
| U, V, W (Axis A, B, C) | Motor Output Connections for each individual axis |
| PE Terminal | Protective Earth Grounding Point |
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| Country of origin |
United States
|