Allen-Bradley 1746-ITV16 Fast Response DC Sourcing Input Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1746-ITV16 is a 16-point, fast-response DC sourcing (PNP) digital input module designed for the SLC 500 programmable controller platform. It is engineered for high-speed discrete signal acquisition in demanding industrial automation environments where standard input response times are insufficient. This module slots directly into any SLC 500 chassis and communicates natively with SLC 5/01 through 5/05 processors.
Selection Background: Why Replacement & Equivalent Models Matter
The 1746-ITV16 has reached end-of-life (EOL) status in Allen-Bradley’s active product portfolio, making replacement and equivalent sourcing a critical concern for maintenance engineers and procurement teams. Whether you are performing a like-for-like swap during an emergency breakdown, planning a controlled migration, or evaluating substitute modules for a capital upgrade project, understanding the full landscape of compatible alternatives ensures system uptime and budget efficiency. Konmask specializes in sourcing verified OEM surplus, refurbished, and functionally equivalent modules to keep your SLC 500 system running.
Technical Specifications
| Parameter | Value | Replacement Impact |
|---|---|---|
| Module Type | DC Sourcing (PNP) Digital Input | ⚠️ Critical — must match sourcing/sinking type |
| Number of Inputs | 16 Points | ⚠️ Critical — point count affects addressing |
| Input Voltage Range | 10–30 VDC | ⚠️ Critical — must match field device voltage |
| Input Current (nominal) | 7 mA @ 24 VDC | Moderate — verify sensor compatibility |
| Response Time (ON) | ≤ 0.1 ms (fast response) | ⚠️ Critical — standard modules are 1–8 ms |
| Response Time (OFF) | ≤ 0.1 ms (fast response) | ⚠️ Critical — affects high-speed counting/detection |
| Isolation | 1500 VAC optical isolation | Moderate — verify for safety applications |
| Backplane Current Draw | 75 mA @ 5 VDC | Moderate — check chassis power budget |
| Operating Temperature | 0–60°C (32–140°F) | Low — standard industrial range |
| Certifications | UL, CSA, CE | Moderate — verify for regulated industries |
| Chassis Compatibility | SLC 500 (1746 series) | ⚠️ Critical — not compatible with ControlLogix/CompactLogix |
| Catalog Number | 1746-ITV16 | — |
Compatible Replacement & Equivalent Models
Category 1 — Direct Drop-in Replacements (Same Form, Fit & Function)
- 1746-ITV16 (OEM Surplus / Refurbished) — Identical hardware, same firmware compatibility. Sourced from decommissioned systems. Requires functional testing and certification before installation. Konmask provides tested units with 12-month warranty.
- 1746-ITV16 (Rockwell Automation New Old Stock) — Factory-sealed units from authorized distributor overstock. Full OEM warranty where available. Contact Konmask to check current availability.
Category 2 — Functional Equivalents (Same Function, Minor Configuration Differences)
- 1746-IV16 — Standard-response 16-point DC sourcing input module. Prerequisite: Acceptable only if your application does not require sub-millisecond response times. Suitable for most standard discrete I/O tasks. Lower cost alternative.
- 1746-IB16 — 16-point DC sinking (NPN) input module. Prerequisite: Field wiring must be reconfigured from PNP to NPN sensors. Not a drop-in; requires engineering review of field devices.
- 1746-IB16E — Enhanced 16-point DC sinking input with diagnostics. Note: Sinking type; additional diagnostic features may require processor firmware update.
Category 3 — Cross-Brand Alternatives (Third-Party / Migration Path)
- Siemens 6ES7 321-1BH02-0AA0 — 16-point 24 VDC digital input for S7-300. Requires full system migration; not a slot-in replacement. Suitable for greenfield redesign projects.
- Mitsubishi QX41 — 16-point DC input for Q-series PLC. Cross-brand migration; requires new chassis, processor, and programming environment.
- Note: Cross-brand alternatives require complete system re-engineering. Konmask recommends consulting our technical team before committing to a cross-brand migration path.
Why Choose the Original 1746-ITV16
- Sub-millisecond Response Precision: ≤ 0.1 ms ON/OFF response is essential for high-speed encoder feedback, proximity detection, and motion control interlocks — no functional equivalent fully replicates this without hardware changes.
- Native SLC 500 Certification: Factory-certified for the 1746 backplane; no compatibility risk, no firmware workarounds, no additional commissioning overhead.
- Seamless RSLogix 500 Integration: Module is natively recognized by RSLogix 500 / Studio 5000 Logix Designer (legacy mode); no custom add-on instructions or EDS files required.
- Regulatory Compliance: UL 508, CSA C22.2, and CE marked — critical for food & beverage, pharmaceutical, and energy sector compliance audits.
- Proven Field Reliability: Decades of deployment in harsh industrial environments with documented MTBF performance in automotive, oil & gas, and discrete manufacturing.
- Konmask Technical Support: Our engineers provide pre-sale compatibility verification, installation guidance, and post-sale troubleshooting — reducing your commissioning risk to near zero.
Typical Applications
- Automotive Assembly Lines: High-speed part-present detection on conveyor systems where standard 1–8 ms response causes missed counts at line speeds above 60 parts/minute.
- Packaging Machinery: Label registration sensors and film registration marks requiring precise, repeatable sub-millisecond input capture.
- Pharmaceutical Manufacturing: Tablet counting and blister pack verification systems with strict GMP documentation requirements — OEM modules simplify validation.
- Oil & Gas Wellhead Control: Fast-response pressure switch and flow sensor inputs in SLC 500-based SCADA panels operating in Class I, Division 2 environments.
- Printing & Converting: Web break detection and registration mark sensing on high-speed web presses where timing accuracy is critical to print quality.
- Material Handling & Sortation: Divert gate confirmation and barcode scanner trigger inputs in high-throughput distribution center sortation systems.
System Compatibility
The 1746-ITV16 is compatible with the following SLC 500 system components:
- 1746-A4 / A7 / A10 / A13 — SLC 500 chassis (4, 7, 10, 13 slot); module occupies one I/O slot
- 1747-L511 / L514 / L524 / L531 / L532 / L541 / L542 / L543 / L551 / L552 / L553 — SLC 5/01 through SLC 5/05 processors; all support 1746 I/O modules
- 1746-P1 / P2 / P3 / P4 — SLC 500 power supplies; verify chassis power budget (module draws 75 mA @ 5 VDC)
- 1747-SDN — DeviceNet Scanner (for networked I/O configurations)
- 1747-SCNR — Remote I/O Scanner for distributed chassis configurations
- 1761-NET-AIC — Advanced Interface Converter for DH-485 network integration
Selection Guide
Answer these three questions to confirm the 1746-ITV16 — or its best alternative — is right for your application:
- Is your application speed-critical? If your field devices switch faster than 100 times per second, or if you are counting pulses, you need the fast-response 1746-ITV16 (≤ 0.1 ms). If standard discrete I/O is sufficient, the 1746-IV16 may be a cost-effective substitute. → Not sure? Contact Konmask with your cycle time requirements.
- Are your field sensors PNP (sourcing) or NPN (sinking)? The 1746-ITV16 is a sourcing (PNP) input module. If your sensors are NPN (sinking), you need the 1746-IB16 or 1746-IB16E instead. Mixing input types without rewiring will result in no signal detection. → Need help identifying your sensor type? Send us your sensor datasheet.
- Is your SLC 500 chassis and processor already in service? If yes, a direct replacement 1746-ITV16 is the lowest-risk path. If you are planning a system upgrade, Konmask can provide a migration assessment comparing SLC 500 continuation vs. ControlLogix/CompactLogix migration ROI. → Contact support@konmask.com for a free compatibility assessment.
Quality Assurance & Sourcing
Sourcing Channels: Konmask sources 1746-ITV16 modules through authorized distributor overstock, OEM-certified surplus from decommissioned systems, and factory-refurbished units from Rockwell Automation’s certified repair network.
4-Step Inspection & Verification Process:
- Visual & Physical Inspection: Board-level inspection for corrosion, component damage, counterfeit indicators, and label authenticity verification against OEM specifications.
- Functional Bench Test: Each module is powered up in a live SLC 500 test chassis. All 16 input points are individually stimulated and verified for correct ON/OFF response at ≤ 0.1 ms.
- Firmware & Revision Verification: Hardware revision and firmware version are documented and disclosed to the buyer prior to shipment.
- Final QC & Documentation: Module is cleaned, anti-static packaged, and shipped with a Konmask test certificate, revision record, and 12-month warranty card.
Available Documentation: Test certificate, hardware revision record, warranty certificate, and customs/export documentation (CO, packing list, commercial invoice) upon request.
How to Order
- Submit Your Inquiry: Email support@konmask.com or call +0086 19859288691 with your required quantity, hardware revision preference (if any), and required delivery date.
- Receive Quote & Availability Confirmation: Konmask will respond within 24 hours with pricing, available stock, hardware revision details, lead time, and shipping options (DHL / FedEx / sea freight).
- Confirm Order & Ship: Upon order confirmation and payment, modules are inspected, packaged, and dispatched within 1–3 business days. Tracking information is provided immediately upon shipment.
Replacement & Compatibility FAQ
Q1: Can I directly replace a 1746-ITV16 with a 1746-IV16 without changing my program?
A: In most cases, yes — the 1746-IV16 is a functional substitute for standard-speed applications and uses the same I/O addressing in RSLogix 500. However, the 1746-IV16 has a standard response time of 1–8 ms versus the ITV16’s ≤ 0.1 ms. If your ladder logic relies on fast-response timing or high-speed counting, this replacement will cause missed signals. Konmask recommends a functional review before substituting.
Q2: Is the 1746-ITV16 compatible with ControlLogix or CompactLogix systems?
A: No. The 1746-ITV16 is exclusively compatible with the SLC 500 (1746 series) backplane. It cannot be installed in a ControlLogix (1756) or CompactLogix (1769) chassis. If you are migrating to a newer Rockwell platform, the equivalent fast-response input module for ControlLogix is the 1756-IB16IF (isolated fast input). Konmask can assist with migration planning.
Q3: What is the difference between the 1746-ITV16 and the 1746-ITB16 — are they equivalent?
A: The 1746-ITV16 is a sourcing (PNP) fast-response input module, while the 1746-ITB16 is a sinking (NPN) fast-response input module. They are functionally equivalent in terms of response speed and point count, but they are not interchangeable without rewiring field devices. Choose based on your sensor output type: PNP sensors → 1746-ITV16; NPN sensors → 1746-ITB16.
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