ABB DSQC661 (3HAC026253-001) – DC Digital Input Module for IRC5/S4C+ Robot Controllers

The ABB DSQC661 DC digital input module (part no. 3HAC026253-001) is the go-to plug-in board for bringing 24 VDC field signals reliably into an ABB robot controller. From my experience, it’s the piece you install when you need clean, opto-isolated inputs from sensors, switches, and safety interlocks without adding a separate PLC input block. You might notice that plants typically use it to consolidate a high count of 24 V sensors into the controller cabinet, cutting down on wiring clutter and fieldbus complexity.

Company’s Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: 1 week for in-stock; no more than one month at the latest
• Payment method: 50% advance payment, full payment for delivery
• Express delivery methods: FedEx, UPS, DHL

Key Features

• 24 VDC digital inputs – Optimized for standard industrial sensors and panel switches used around ABB cells.
• Opto-isolated channels – Helps protect the controller backplane from field noise and wiring faults.
• Tight controller integration – Direct backplane connection to the ABB robot (no external gateway needed in most cases).
• Stable signal processing – Debounce and filtering at the module level typically result in fewer false triggers.
• Compact, cabinet-friendly – Fits the controller slot without consuming extra rail space; wiring remains tidy.
• Serviceability – Straightforward replacement; no re-engineering of the I/O map when swapping like-for-like modules.

Technical Specifications

Brand / Model	ABB DSQC661 (3HAC026253-001)
Product Type	DC Digital Input Module for ABB robot controllers (IRC5 / S4C+ families)
HS Code	853890 (Parts suitable for apparatus of heading 8537)
Power Requirements	24 VDC provided via controller/backplane; typical module consumption < 5 W
Signal Input Type	24 VDC digital inputs, opto-isolated; commonly used with PNP sourcing sensors
Communication Interface	Internal ABB backplane (no external fieldbus on the module)
Operating Temperature	0 to 55°C cabinet ambient, non‑condensing (typical for controller-mounted boards)
Installation Method	Controller slot/board installation; field wiring via controller I/O terminal harness
Dimensions & Weight	Controller plug‑in board form factor; typically < 0.5 kg (varies by revision)

Application Fields

This module is usually selected wherever ABB robots need direct, noise‑robust digital sensing at 24 VDC:

• Automotive body-in-white lines: door clamps, part-present switches, cell interlocks.
• Packaging and palletizing: photoeyes, case sensors, end-of-travel confirmations.
• Metalworking: guard doors, light stack inputs, feeder ready signals.
• Electronics/assembly: fixture clamps, error-proofing pins, poke-yoke sensors.

A maintenance lead at a tier-1 supplier told us they swapped in a DSQC661 during a weekend outage and had their I/O back online in under an hour—no PLC logic changes, just a like-for-like module exchange and an I/O test in the pendant.

Advantages & Value

• Reliability – Opto-isolation and ABB backplane signaling reduce nuisance trips from electrical noise.
• Compatibility – Designed for ABB robot controllers; I/O mapping aligns with standard ABB configuration methods.
• Fewer components – Often removes the need for external I/O gateways, cutting cabinet complexity.
• Cost control – Lower integration and maintenance time; spare stocking is straightforward across similar cells.
• Technical support – Easy for technicians to diagnose using RobotStudio/pendant I/O status in most cases.

Installation & Maintenance

• Cabinet standards – Install in the designated ABB controller slot; maintain cabinet ambient 0–55°C with adequate ventilation.
• Wiring – Use 24 VDC, PNP sensor wiring with proper 0 V reference; keep sensor and power wiring segregated; shield long runs.
• Safety – Isolate power and follow ESD precautions before handling; verify interlocks via pendant I/O monitor after installation.
• Routine checks – Periodically validate all input points, clean connectors, and re-seat harnesses during planned downtime.
• Firmware/compatibility – Match the module revision to the controller’s system pack where applicable; back up I/O configuration before changes.

Quality & Certifications

• CE compliant; UL/cUL recognition is typical for ABB controller modules.
• Manufactured under ISO 9001 quality systems (ABB global standards).
• RoHS conformity depends on manufacturing year/revision; can be confirmed by serial.
• Warranty: 365 days (repair/replace as applicable).

Complementary/Supporting Components

To round out a clean I/O architecture, many teams pair the DSQC661 with:

• ABB DSQC662 – DC digital output module for valve banks and relays.
• ABB DSQC652/DSQC1000-series interfaces – Depending on controller and cabinet kit.
• Shielded I/O harnesses and labeled terminal kits for faster troubleshooting.

From my experience, the DSQC661 is the sensible choice when you want dependable, controller-native digital inputs with minimal integration risk. If you can share your controller type and current I/O map, we can verify channel density and confirm revision compatibility before shipment.