Technical Description: Mitsubishi R38B Main Base Unit
The Mitsubishi R38B is a fundamental component of the MELSEC iQ-R Series PLC system. This 8-slot main base unit serves as the backbone for the entire control architecture, providing the high-speed communication backplane and power distribution required for CPU modules, I/O modules, and specialized function blocks. The iQ-R series is Mitsubishi’s flagship automation platform, designed to reduce total cost of ownership while maximizing production speed and data security.
High-Speed Backplane and System Architecture
The R38B features a revolutionary high-speed bus that significantly reduces communication latency between modules. This is critical for complex multi-axis motion control and high-speed data logging applications. The base unit is designed for rugged industrial mounting on DIN rails or panels and provides the structural integrity needed to maintain secure electrical connections even in high-vibration environments. It includes a dedicated slot for the power supply module and seven additional slots for the CPU and functional modules.
Key Characteristics
- Part Number: R38B.
- Number of Slots: 8 Slots (1 for Power, 7 for CPU/Modules).
- Series: MELSEC iQ-R.
- Installation: DIN rail or Screw mounting.
- Dimensions: 328 mm (Width) x 101 mm (Height).
- Communication: High-speed iQ-R bus interface.
- Compatibility: Supports all R-series modules.
- Internal Current Consumption: 0.23 A.
Advanced Integration for Industry 4.0
The R38B is engineered for the future of manufacturing. By providing a stable and fast communication path, it allows for the seamless integration of CC-Link IE Field networking and advanced safety modules. The unit is designed with protective covers for unused slots to prevent dust ingress and accidental contact with the bus. Its reliable power distribution logic ensures that each module receives a stable voltage, protecting sensitive electronics from fluctuations.
| Category | Specification |
| Mounting Hole Size | M4 |
| Standard Compliance | CE, UL, cUL, KC |
| Operating Humidity | 5 to 95% RH (Non-condensing) |
Maintenance Insights
The R38B is a passive component but requires periodic inspection of the module locking tabs. When expanding the system, ensure that the total current consumption of the installed modules does not exceed the capacity of the power supply module installed in the R38B. For systems requiring more than 8 slots, an extension cable can link the R38B to an extension base unit.
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