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Mitsubishi Electric Q68B — PLCs (Programmable Logic Controllers)

Mitsubishi Q68B Extension Base Unit, 8 I/O Slots, Mature

MPNQ68B

Mitsubishi MELSEC Q Series extension base unit, 8 I/O slots, 1 power supply slot, 0.38 kg, mature lifecycle.

$125.00 – $323.85Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

Q68B — Mechanical
ParameterValue
Weight0.38 Kg
Q68B — Other specifications
ParameterValue
Product typeExtension Base Units
InstallationsAll base units provide installation holes for M4 screws.
Slots for i (O modules)8
Dimensions (WxHxD) approx32.8 cm x 9.8cm x 4.41 cm
Slots for power supply modules1

Product details

The Mitsubishi Q68B is an extension base unit for the MELSEC Q Series PLC platform. It provides 8 slots for I/O modules and a dedicated slot for a power supply module, expanding the system beyond the main base unit.

Eight I/O slots give you room for up to 64 points of discrete I/O or a mix of analog and special-function modules, depending on module width. The single power supply slot means you need a Q Series power supply module (sold separately) to power the backplane and all installed modules.

This base unit is installed in control panels for industrial automation — machine control, process lines, material handling. It mounts using M4 screws through the provided installation holes, sized for a standard backplate.

Frequently asked questions

What is Q68B's listed weight?

The Q68B has a listed weight of 0.38 kg.

Will Q68B drop into a panel that was specified around FX3S-20MR/ES without rewiring?

No. The FX3S-20MR/ES is a compact PLC with integrated I/O and a different form factor. The Q68B is a modular extension base for the MELSEC Q Series — it requires a separate CPU and power supply, and its mounting hole pattern and dimensions are different. A panel designed for the FX3S would need significant rework.

What compliance documentation does Mitsubishi provide for Q68B?

The Q68B carries UL, cUL, CE (EMC and RoHS), KC (EMC), and marine approvals (LR, NK, DNV, ABS, RINA, BV). Compliance documentation is available from Mitsubishi or through the distributor upon request.

MPN
Q68B