Q38B MELSEC-Q 8-Slot Main Base Unit for Power Supply & CPU | Mitsubishi

The Original New Mitsubishi Q38B is an 8-slot main base unit for the MELSEC-Q series programmable logic controller system. It provides the physical and electrical backplane for mounting a Q series power supply module, a Q series CPU module, and up to 6 Q series I/O or intelligent function modules. The Q38B is designed as a "normal type" main base unit for standard control applications, and it supports expansion connection to additional Q series extension base units. Its compact 328 mm width and M4 screw mounting make it suitable for space‑efficient panel installation in industrial automation systems.

Core Engineering Highlights:
8 slots total (1 power supply + 1 CPU + 6 I/O module slots) | Extendable with Q series extension base units | 5 V DC internal current consumption: 0.12 A | Dimensions: 328 × 98 × 44.1 mm | Weight: 0.35 kg | Mounting: M4 screw hole or φ4.5 hole | DIN rail mounting adapter Q6DIN1 (sold separately) | Compatible with Q series power supply and CPU modules

Key Features:

• Original New Mitsubishi Q38B main base unit

• 8 slots: 1 dedicated power supply slot, 1 CPU slot, 6 slots for I/O and intelligent function modules

• Normal type main base unit for standard Q series control systems

• Supports expansion connection to Q series extension base units

• 5 V DC internal current consumption: 0.12 A

• M4 screw hole or φ4.5 hole mounting

• DIN rail mounting possible with Q6DIN1 adapter (sold separately)

• Compact width of 328 mm for space-efficient panel layout

• Compatible with the full range of MELSEC-Q series modules

• RoHS compliant, CE, UL/cUL, UKCA approved

• Shipping approvals: ABS, BV, DNV GL, LR, NK, RINA

Applications:

• Central backplane for MELSEC-Q series PLC systems

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

• Medium-scale machine automation and process control

• Factory automation and production line control

• Distributed I/O architectures with extension base units

• Industrial control panels requiring modular PLC configuration

Technical Specifications:

System Compatibility:

• Compatible with MELSEC-Q series power supply modules including Q61P, Q61P-A1, Q61P-A2, Q62P, Q63P, Q64P and others (model selection depends on required output current and input voltage)

• Compatible with MELSEC-Q series CPU modules including Q00UJ, Q01U, Q02U, Q03UD, Q04UDH, Q06UDH, Q10UDH, Q13UDH, Q20UDH, Q26UDH and other QnU series CPUs

• Compatible with the full range of MELSEC-Q series I/O modules, intelligent function modules, and communication modules

• Extendable with Q series extension base units such as Q68B (8-slot extension with power supply) and Q612B (12-slot extension with power supply)

• Programmed using GX Works2 or GX Developer engineering software

Related Products:

• Q61P – Power supply module, 100–240 V AC input, 5 V DC 6 A output

• Q62P – Power supply module, 100–240 V AC input, 5 V DC 3 A + 24 V DC 0.6 A output

• Q63P – Power supply module, 24 V DC input, 5 V DC 6 A output

• Q03UDECPU – MELSEC-Q CPU module with built-in Ethernet, 30K steps

• Q68B – 8-slot extension base unit with power supply slot

• Q612B – 12-slot extension base unit with power supply slot

• Q35B – 5-slot main base unit (lower slot count)

• Q312B – 12-slot main base unit (higher slot count)

• Q38DB – 8-slot multiple CPU high-speed main base unit (successor for multi-CPU high-speed applications)

• Q6DIN1 – DIN rail mounting adapter for Q38B (sold separately)

• Q61P – Power supply module (mating unit)

Related Successor:

• Q38DB – Multiple CPU high-speed type main base unit, 8 slots, power supply module required, for Q series modules, multi-CPU high-speed transmission supported

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. Mitsubishi, MELSEC, and MELSEC-Q are trademarks of Mitsubishi Electric Corporation.