Keyence KV-40R Programmable Logic Controller — Relay-Output Compact PLC

KV-Series Compact PLC · 24 VDC · Relay Outputs · In-Box / Expedited Shipping

The Keyence KV-40R is a compact, brick-style programmable logic controller from Keyence's KV-series. The "40" in the part number denotes the I/O count (typically 24 inputs / 16 outputs, depending on the variant), and the "R" suffix indicates relay outputs — the right choice when the controller is driving 24 VDC solenoids, small motor contactors, or 100/200 VAC indicator lamps without needing high-speed switching. The KV-40R runs KV-script plus ladder logic, programs over USB, and supports the same KV-series expansion I/O ecosystem used across the rest of the line.

At koeed.com we list the KV-40R as a small-format machine controller. It is the go-to PLC for OEM machine builders, lab-automation cells, and small assembly stations where Keyence's KV-series is the standard platform — the same controller shows up in Keyence vision cells, in-line gauging stations, and high-mix / low-volume packaging lines.

Key Specifications

Datasheet Highlights

• 40 built-in I/O points in a single compact CPU — enough for a small machine, with the option to add KV-series expansion if the line is later upgraded.
• Relay outputs accept AC or DC loads without a separate interposing relay, which is the right call on a small panel that drives 24 VDC solenoids, 200 VAC contactors, and indicator lamps.
• Fast scan time plus KV-script high-level instructions keep the program small — a typical 40-I/O machine fits in a few kB of program memory.
• USB programming port eliminates the need for a serial cable, and KV Studio is the free Keyence IDE for ladder, KV-script, and structured text.
• Battery-backed retain relays and data registers survive power cycles — recipe and counter values persist between shifts.
• Expedited shipping from EU/US stock: a machine-down cell that has a Keyence KV-40R in its BOM is back online in days, not weeks.

Typical Applications

• OEM machine builders: small-format packaging, labelling, filling, and assembly machines where the KV-40R is the standard machine controller.
• Lab & bench automation: test rigs, life-test stations, and environmental chambers where the KV-40R is paired with a Keyence CV-X or IV3 vision system.
• Keyence vision cells: the controller in a vision-inspection cell, sequenced with Keyence LJ-X / TM-X measurement heads and a Keyence GT2 HMI.
• High-mix / low-volume assembly: discrete product cells where the controller is reloaded with a new recipe via USB between batches.
• Process skids: skid-mounted dosing, mixing, and dispensing skids where the KV-40R drives solenoid valves and reads flow / level sensors.
• Educational & training labs: university and vocational training cells that use the KV-series as a teaching platform.

Related Modules & Cross-Reference

A KV-40R swap is a good time to inspect the I/O, the HMI, and the supporting I/O. KOEED can ship the controller with the expansion, HMI, and vision components in one consignment:

Browse the KOEED PLC modules and Keyence collections to bundle a full KV-series rebuild kit.

Warranty & Authenticity

Each KV-40R is supplied as a brand-new, factory-sealed Keyence controller in the original box with the side label intact. KOEED sources from authorised Japanese and EU distribution, and counterfeits / pulled units are rejected at incoming inspection. A 12-month limited warranty covers manufacturing defects; KOEED handles return shipping and replacement from EU/US stock at no charge.

Cross-reference: KV-40R · KV40R · Keyence KV-series compact PLC · relay output · 24 VDC inputs · B2B industrial automation spares. KOEED Automation — independent distributor of industrial automation spare parts, including Allen-Bradley, Siemens, Mitsubishi, Omron, Schneider Electric, FANUC, Yaskawa, Panasonic, and Keyence.