Koyo D4-32TD2 – 32‑Point 12–24 VDC Sourcing Output Module for DL405 PLC Systems

The Koyo D4-32TD2 is a high-density DC transistor output module designed for DL405 platforms. From my experience, it’s a straightforward way to expand discrete outputs when you need clean, fast switching for 24 VDC loads without the heat and wear that come with relays. You might notice that it’s particularly handy on machines with a lot of solenoid valves, indicator lamps, and small DC actuators—places where you need reliable PNP (sourcing) outputs in a compact footprint.

Order Placement Process and Guarantees

Key Features

• 32 DC outputs (PNP sourcing) – Efficient high-density output card for 12–24 VDC loads.
• DL405 backplane integration – Installs directly into DL405 I/O bases for quick expansion.
• Solid-state switching – No mechanical contacts; typically better longevity and faster response than relay modules.
• Grouped commons – Practical wiring across multiple common groups, which simplifies field wiring and troubleshooting in many cases.
• Noise-resistant design – Opto/transistor output architecture that, in most cases, helps reduce electrical noise back into the PLC bus.
• Compact, serviceable layout – Clear front labeling and terminal access for faster commissioning.

Technical Specifications

Application Fields

This module fits where you need many 24 VDC outputs with dependable switching and straightforward wiring:

• Packaging lines and pick‑and‑place equipment (solenoids, lamps, ejectors)
• Conveyors and material handling (photoeye outputs, diverters, stack lights)
• Water/wastewater skids (valve coils, small DC actuators)
• Automotive and general OEM machinery with distributed 24 VDC controls
• Process auxiliary controls where fast, solid-state outputs are preferred

A maintenance lead at a food packaging OEM told us they moved several stations from relay cards to the D4-32TD2 and saw fewer output failures on inductive loads after adding proper suppression. That seems to be a common result when upgrading to transistor outputs.

Advantages & Value for Procurement

• Reliability – Solid-state outputs typically outlast relays, especially in high-cycle applications.
• Compatibility – Native fit for DL405 bases and CPUs; minimal engineering changes for expansions.
• Panel density – 32 channels per slot helps reduce base count and enclosure size.
• Cost control – Lower maintenance in many cases and simplified spares stocking (one high-density card instead of multiple low-count cards).
• Support – Widely used in the field, so documentation and application notes are readily available.

Installation & Maintenance

• Cabinet and environment – Mount the DL405 base in a clean, dry, ventilated panel; allow space for airflow and cable bend radius.
• Wiring – As a sourcing (PNP) module, the outputs provide +24 VDC to the load; return the other side of the load to 0 VDC. Group commons should be tied to the appropriate 24 VDC supply rails.
• Inductive loads – Use flyback diodes or equivalent suppression on DC coils. Even with transistor outputs, this step extends module life.
• Grounding and noise – Keep power and I/O wiring separated; bond panel ground properly to reduce coupling into sensors and outputs.
• Routine checks – Periodically re-torque terminals, inspect for discoloration, and clean dust with dry air. The I/O module has no firmware; if needed, keep the CPU firmware up to date.

Quality & Certifications

• Certifications: CE, UL/cUL, RoHS (typical for DL405 I/O; model-specific certifications available on request)
• Manufacturer’s warranty: 12 months

Related/Supporting Components

• DL405 bases – D4-08B-1, D4-16B-1 depending on slot count required.
• DL405 CPUs – Models such as D4-430 or D4-450 for higher performance applications.
• Power supplies – DL405 base power supplies sized to the total backplane load (I/O + CPU).
• Interposing relays – Recommended when switching higher currents or different voltages than the module is rated for.
• Surge suppression – DIN-rail diode modules or RC snubbers for inductive loads to reduce back-EMF.