Mitsubishi Q38B MELSEC-Q 8-Slot Main Base Unit

Mitsubishi Electric MELSEC-Q series main base unit (main base rack) for Q series PLC systems. Provides 8 I/O slots for installing Q series modules. Requires one power supply module and one CPU module. Supports main base expansion with up to 7 extension base units (total up to 64 modules, base unit count up to 8). 5 V DC backplane current consumption 0.12 A. Panel or DIN rail mounting (DIN rail adapter Q6DIN1 sold separately).

Applications:

• Central chassis for Q series PLC systems

• Hosting power supply, CPU, I/O and intelligent function modules

• Main base for single-CPU or multi-CPU configurations (standard type, not multi-CPU high-speed type)

• Industrial automation control panels and machine control systems

Core Specifications:

• Product type: Main base unit (normal type)

• Number of slots: 8 (for I/O modules, intelligent function modules, etc.)

• Power supply slot: 1 (leftmost slot)

• CPU slot: 1 (second slot from left)

• Current consumption (5 V DC internal power supply): 0.12 A

• Mounting type: Panel mounting or DIN rail (rail adapter Q6DIN1 optional)

• Mounting hole size: M4 screw hole or ø4.5 mm hole (for M4 screw)

• Certification: CE, UL/cUL, EAC, UKCA, ABS, BV, DNV GL, LR, NK, RINA

• RoHS compliant, REACH compliant (lead CAS 7439‑92‑1, titanium oxide CAS 12060‑00‑3)

• Material group: Standard material

• WEEE classification: B2B

• Country of origin: Japan

Physical Specifications:

• Width: 328 mm

• Height: 98 mm

• Depth: 44.1 mm

• Weight: approx. 0.35 kg – 0.37 kg

Environmental Specifications:

• Operating temperature: 0 °C … 55 °C

• Storage temperature: –20 °C … 75 °C

• Operating humidity: 10 % … 90 % (non‑condensing)

System Integration:

• This base unit belongs to the Mitsubishi Electric MELSEC‑Q series.

• Installs in control cabinet via panel mounting (M4 screws) or optionally on DIN rail using Q6DIN1 adapter (sold separately).

• One main base unit can be extended with up to 7 extension base units (total 8 bases), maximum 64 modules. Extension cable length up to 13.2 m.

• Slot order: Power supply module (leftmost), CPU module, then I/O and intelligent modules. Slot numbers correspond to I/O addresses (0 to 7).

• For detailed installation, bus configuration, and expansion cabling, refer to the QCPU User's Manual (Hardware Design, Maintenance and Inspection).

Related Products:

• Q33B – 3 I/O slots (lower capacity)

• Q35B – 5 I/O slots (mid capacity)

• Q38B – 8 I/O slots (current model)

• Q312B – 12 I/O slots (higher capacity)

• Q6DIN1 – DIN rail mounting adapter (for rail mount)

• Q38DB – 8‑slot multi‑CPU high‑speed base unit (for high‑speed inter‑CPU communication)