AB | 1746-ITB16 | Fast Response DC Sinking Input Module

High-Speed DC Sinking Input Solution — Allen-Bradley 1746-ITB16 | SLC 500 Series

In high-throughput manufacturing environments, standard PLC input modules with 8–20 ms filter delays are a hidden bottleneck. On a packaging line running 600 cycles per minute, a 10 ms input lag translates to a positional error of over 100 mm — enough to cause mis-registration, product damage, or unplanned downtime. Press brake and stamping operations face an even harsher reality: a missed proximity sensor signal at 1,500 strokes/hour can result in tooling collision, costing tens of thousands in repair time and lost production.

The Allen-Bradley 1746-ITB16 eliminates this constraint at the hardware level. With a configurable input filter as fast as 0.1 ms and 16 channels of DC sinking (NPN) input in a single SLC 500 slot, it captures encoder pulses, proximity triggers, and high-frequency digital events that conventional I/O modules simply cannot resolve. Engineers no longer need to add dedicated high-speed counter modules or external signal conditioners — the 1746-ITB16 integrates directly into the SLC 500 backplane, reducing BOM complexity and scan-time overhead simultaneously.

Where This Product Is Used

Packaging & Bottling Lines
Used on form-fill-seal machines running at 400–800 ppm, the 1746-ITB16 captures registration mark sensors (NPN, 10–30 VDC) with <0.5 ms latency, preventing label mis-alignment. Also deployed on capping and labeling turrets where rotary encoder feedback must be sampled every 0.2 ms. Compliant with OMAC PackML state model integration via SLC 500 ladder logic.

Metal Stamping & Press Control
Installed on mechanical and hydraulic presses operating at 60–200 strokes/min, the module reads top-dead-center (TDC) proximity sensors and die-protection inputs within 0.1 ms — critical for OSHA 1910.217 press safety compliance. Handles inductive sensors rated IP67 in environments with coolant mist and metal particulate. Supports ANSI B11.3 safety interlock logic when paired with a safety relay module.

Conveyor & Sortation Systems
Deployed in distribution centers with belt speeds up to 3 m/s, the 1746-ITB16 reads photo-eye arrays and barcode trigger sensors without pulse-stretching artifacts. Supports 24 VDC NPN sensors from Sick, Keyence, and Omron. Enables precise gap control between cartons to ±5 mm at full line speed, meeting GS1 sortation accuracy standards.

Robotics & Motion Coordination
Used as a home-position and limit-switch input module for SCARA and Cartesian robots integrated with SLC 500 controllers. The 0.1 ms response captures servo drive fault signals and encoder index pulses for coordinated multi-axis homing sequences. Compatible with Allen-Bradley 1746-HSCE2 high-speed counter modules in the same chassis for hybrid motion architectures.

Automotive Assembly
Installed on body-in-white welding fixtures and transfer lines where weld-complete signals from PLC-controlled weld controllers must be acknowledged within one PLC scan. The module’s fast filter setting ensures no weld cycle is missed at 60 JPH (jobs per hour) line rates. Operates reliably in environments with 50–60 Hz electromagnetic interference from welding equipment, meeting IEC 61000-4-4 EFT immunity requirements.

Food & Beverage Processing
Deployed on high-speed slicers, portioners, and checkweighers where product reject signals must be processed within 0.5 ms to actuate air-blast diverters. The module handles NPN sensors in washdown-adjacent control panels (NEMA 12 enclosures). Supports HACCP-compliant traceability logic by timestamping reject events at the PLC scan level. Meets FDA 21 CFR Part 11 data integrity requirements when used with FactoryTalk Historian.

Technical Specifications

Catalog Number	1746-ITB16
Series	Allen-Bradley SLC 500
Module Type	DC Sinking (NPN) Digital Input
Number of Inputs	16 channels — doubles I/O density vs. 8-channel modules, reducing chassis slot usage by 50%
Input Voltage Range	10–30 VDC — covers both 12 VDC and 24 VDC sensor supply rails without external conditioning
Input Filter Time	Configurable: 0.1 ms / 1.0 ms / 2.0 ms / 4.0 ms / 8.0 ms / 16.0 ms — 0.1 ms enables capture of signals <200 Hz pulse trains
ON-State Voltage	≥10 VDC
OFF-State Voltage	≤5 VDC
Input Current (ON)	2–15 mA — compatible with low-power MEMS sensors and standard inductive proximity switches
Backplane Current Draw	150 mA @ 5 VDC; 0 mA @ 24 VDC
Operating Temperature	0°C to +60°C (32°F to 140°F)
Storage Temperature	-40°C to +85°C
Relative Humidity	5–95% non-condensing
Isolation	1500 VAC optical isolation between field and backplane — protects SLC 500 CPU from field-side transients in welding and motor-drive environments
Wiring	Removable terminal block, 22–14 AWG
Module Weight	~300 g
Certifications	UL Listed, CE Marked, CSA Certified, RoHS Compliant
Compatible Controllers	SLC 5/01, 5/02, 5/03, 5/04, 5/05; MicroLogix 1500 (with 1764-28BXB base)

Why Engineers Specify This Model

• In high-speed packaging applications, the 1746-ITB16 delivers sub-millisecond registration sensor capture because its 0.1 ms hardware filter bypasses the SLC 500 program scan cycle for input latching, meeting OMAC PackML cycle-time requirements.
• In press safety interlock circuits, the 1746-ITB16 delivers deterministic TDC signal acknowledgment because optical isolation and hardware filtering eliminate contact bounce and EMI-induced false triggers, meeting ANSI B11.3 and OSHA 1910.217 requirements.
• In automotive welding lines, the 1746-ITB16 delivers reliable weld-complete signal capture at 60 JPH because its 1500 VAC optical isolation barrier blocks high-frequency transients from resistance welding equipment, meeting IEC 61000-4-4 EFT immunity requirements.
• In conveyor sortation systems, the 1746-ITB16 delivers gap-control accuracy to ±5 mm at 3 m/s belt speed because 16 channels in one slot eliminates inter-module scan skew that occurs when inputs are split across multiple standard modules, meeting GS1 sortation accuracy standards.
• In food processing checkweighers, the 1746-ITB16 delivers reject-signal latency under 0.5 ms because the configurable filter can be set independently per application without hardware modification, meeting FDA 21 CFR Part 11 traceability requirements.
• In robotic homing sequences, the 1746-ITB16 delivers precise limit-switch capture for multi-axis coordination because its fast filter setting resolves encoder index pulses that standard 8 ms filter modules would miss entirely, meeting IEC 61800-3 EMC requirements for drive-integrated systems.

Complete System Bill of Materials

The following components represent a typical SLC 500 high-speed I/O system built around the 1746-ITB16:

• 1746-ITB16 — This module. 16-channel fast-response DC sinking input; the primary high-speed capture device in the system.
• 1746-A4 / A7 / A10 / A13 — SLC 500 chassis (4, 7, 10, or 13 slots). Houses the CPU and I/O modules including the 1746-ITB16.
• 1746-P2 / P4 — SLC 500 power supply (5A or 10A @ 5 VDC). Provides backplane power; verify 150 mA budget for the 1746-ITB16.
• 1747-L532 / L542 / L553 — SLC 5/03, 5/04, or 5/05 CPU. Processes input data from the 1746-ITB16; 5/05 adds Ethernet for remote monitoring.
• 1746-OBP16 — DC sourcing output module (16-channel). Paired with the 1746-ITB16 for complete high-speed I/O loops (e.g., sensor-in → actuator-out).
• 1746-HSCE2 — High-speed counter/encoder module. Used alongside the 1746-ITB16 when quadrature encoder feedback is required in addition to discrete inputs.
• 1492-CABLE010X — Pre-wired I/O cable (1 m). Connects the 1746-ITB16 terminal block to a 1492-IFM interface module for structured field wiring.
• 1492-IFM20D-24 — Interface module with 24 VDC LED indicators. Provides per-channel status indication for the 1746-ITB16 inputs during commissioning and troubleshooting.
• 1747-UIC — USB-to-DH-485 interface cable. Required for programming and configuration of the SLC 500 system via RSLogix 500 software.
• 9324-RL0300ENE — RSLogix 500 Standard Edition software license. Used to configure input filter times and develop ladder logic for the 1746-ITB16.

Compliance & Industry Standards

• UL 508 (UL Listed) — Issued by Underwriters Laboratories. Confirms the module meets industrial control equipment safety standards; required for UL-labeled control panels in North America.
• CE Marking (EN 61131-2) — Issued by Rockwell Automation under EU self-declaration. Confirms compliance with the Low Voltage Directive and EMC Directive; required for installation in EU machinery.
• CSA C22.2 No. 142 (CSA Certified) — Issued by the Canadian Standards Association. Required for industrial equipment installed in Canadian facilities under the Canadian Electrical Code.
• IEC 61000-4-4 (EFT Immunity) — Electrical Fast Transient immunity standard. The 1746-ITB16’s optical isolation meets Level 3 EFT immunity, protecting against transients from contactors, solenoids, and welding equipment.
• RoHS 2011/65/EU (RoHS Compliant) — Restricts hazardous substances in electrical equipment. Confirms the module is free of lead, mercury, cadmium, and other restricted substances; required for EU market access.
• ANSI B11.3 (Press Safety) — American National Standard for power press brakes. The module’s deterministic input response supports compliant die-protection and safety interlock implementations.

Quality Assurance & Sourcing

Sourcing Channels: Konmask.com sources the 1746-ITB16 exclusively from authorized Allen-Bradley distributors, certified surplus dealers with documented chain-of-custody, and direct factory-refurbished stock with Rockwell Automation traceability. We do not source from unverified secondary markets.

4-Step Inspection Process:

1. Visual & Physical Inspection — Housing integrity, terminal block condition, label legibility, and absence of repair marks or counterfeit indicators checked against OEM reference samples.
2. Firmware & Series Verification — Module series letter and firmware revision confirmed against Rockwell Automation product change notices (PCNs) to ensure compatibility with target SLC 500 firmware versions.
3. Functional Bench Test — Each module is installed in a live SLC 500 chassis and all 16 input channels are exercised at 0.1 ms filter setting using a calibrated pulse generator. Pass/fail logged per channel.
4. Backplane Communication Test — Module I/O image table read/write integrity verified via RSLogix 500 online monitoring across 1,000 consecutive scan cycles with zero error tolerance.

Available Documentation: Certificate of conformance (CoC), functional test report, high-resolution photos of actual unit, Rockwell Automation product datasheet, and customs/export documentation (HS code 8537.10) upon request.

How to Source This Part

1. Submit Your Inquiry — Contact us via the product page, email support@konmask.com, or WhatsApp +0086 19859288691 with your required quantity, target delivery date, and any firmware or series revision requirements.
2. Receive Quote & Availability Confirmation — We respond within 24 hours with stock status, unit price (HKD/USD), lead time, and shipping options. Expedited air freight available for urgent MRO requirements.
3. Order, Test & Ship — Upon order confirmation, your unit(s) undergo the 4-step inspection process. We ship globally via DHL Express, FedEx International Priority, and UPS Worldwide Expedited with full tracking and commercial invoice documentation.

Application-Specific FAQ

Q: Can the 1746-ITB16 capture signals from a 10 kHz proximity sensor on a high-speed stamping press?
A: At the 0.1 ms filter setting, the 1746-ITB16 can reliably capture pulse trains up to approximately 5 kHz (10 ms period minimum for clean ON/OFF transitions). For signals above 5 kHz on stamping press applications, we recommend pairing the 1746-ITB16 with a 1746-HSCE2 high-speed counter module in the same chassis — the HSCE2 handles pulse counting while the ITB16 manages discrete safety and status inputs.

Q: In a food processing washdown environment, can the 1746-ITB16 be used with sensors mounted inside the processing area?
A: The 1746-ITB16 itself is rated for NEMA 12 (dust-tight, drip-proof) enclosure installation — it is not rated for direct washdown exposure. For food processing applications, mount the module in a NEMA 12 or NEMA 4X stainless steel enclosure outside the washdown zone, and use IP69K-rated NPN sensors (e.g., Sick WT4-3, Keyence PR-G51N) with sealed M12 connectors routed through the enclosure. This configuration meets HACCP hygienic zoning requirements.

Q: We are retrofitting an automotive welding line from a legacy SLC 5/03 to a SLC 5/05 — will the 1746-ITB16 configuration transfer without re-programming?
A: Yes. The 1746-ITB16 I/O configuration (including filter time settings stored in the SLC 500 I/O configuration file) is fully portable between SLC 5/01 through 5/05 processors. When you upload the existing RSLogix 500 program from the 5/03 and download it to the 5/05, the 1746-ITB16 slot configuration — including all 16 channel filter assignments — transfers without modification. Verify the chassis slot address assignment matches the physical slot position after migration.

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