AB | 1746-IV16 | SLC 16-Point Digital Input Module

Discrete Input Control Solution – Allen-Bradley 1746-IV16 | SLC 500 Series

In modern manufacturing environments, unreliable discrete signal acquisition is one of the leading causes of unplanned downtime. Studies show that signal-related faults account for up to 23% of PLC-driven line stoppages, with each incident costing an average of $5,000–$22,000 per hour in lost production. When a proximity sensor, limit switch, or push-button fails to register correctly at the controller level, the consequences cascade: false E-stops, missed cycle counts, and safety interlock failures that halt entire production cells.

The Allen-Bradley 1746-IV16 eliminates this vulnerability at the hardware layer. As a 16-point, 24VDC sourcing discrete input module engineered for the SLC 500 fixed and modular chassis, it provides deterministic, noise-immune signal acquisition with per-point LED diagnostics — giving maintenance teams instant visual fault isolation without a laptop. Its 1500V optical isolation barrier decouples field wiring from the backplane, protecting the entire SLC rack from transient surges common in motor-heavy environments. Engineers specify this module because it converts the unpredictable analog reality of the plant floor into clean, reliable digital data the SLC processor can act on in every scan cycle.

Where This Product Is Used

Automotive Assembly & Body Welding
Used to monitor weld-gun home position, clamp confirmation, and part-present sensors on transfer lines operating at 60–120 parts/hour. Typical environment: 40–60°C ambient, heavy EMI from welding inverters. The 1746-IV16’s 1500V isolation and 5ms input filter suppress weld-spatter-induced transients, maintaining ANSI/RIA R15.06 safety interlock integrity.

Food & Beverage Packaging Lines
Monitors fill-level sensors, cap-torque confirmation switches, and conveyor jam detectors on lines running at 200–600 units/minute. Washdown-adjacent installations (IP54 enclosures) with 24VDC field devices. Supports OMAC PackML state-machine logic by providing reliable RUN/IDLE/FAULT discrete inputs to the SLC processor.

Pharmaceutical Batch Processing
Captures door-interlock, agitator-seal, and pressure-relief valve position signals in Class I Div 2 adjacent areas. 24VDC sourcing compatibility aligns with NAMUR NE 21 EMC requirements. Supports 21 CFR Part 11 audit trails when paired with SLC 5/05 Ethernet processors logging to FactoryTalk Historian.

Material Handling & Conveyor Systems
Reads zone-occupancy photoeyes, divert-confirmation sensors, and e-stop chains across sortation systems spanning 50–500 metres. The module’s 16 points per slot maximise chassis density, reducing rack count in distributed junction boxes operating at 0–55°C.

Water & Wastewater Treatment
Monitors pump run/fail dry contacts, valve open/closed limit switches, and high-level float switches in outdoor NEMA 4X panels. 24VDC compatibility with two-wire transmitters and the module’s low 6mA input current draw reduce power supply sizing requirements in solar-assisted remote lift stations.

Oil & Gas Wellpad Automation
Captures separator level switch, ESD valve position, and flame-detector discrete outputs in SIL-rated safety loops. The optical isolation and CE/UL certification support IEC 61511 functional safety documentation packages for SIL 1–2 applications when used within a validated SLC 500 safety architecture.

Technical Specifications

Catalog Number	1746-IV16
Series	SLC 500 (Fixed & Modular Chassis)
Number of Inputs	16 points (2 groups of 8, isolated commons) — maximises I/O density per chassis slot
Input Voltage Range	10–30V DC (nominal 24VDC) — compatible with all standard 24VDC field devices
Input Type	Sourcing (current sinking to common) — matches PNP sensor outputs standard in EU/Asia installations
ON-State Voltage	≥10V DC
OFF-State Voltage	≤5V DC
Input Current (ON)	6mA @ 24VDC — low draw reduces 24VDC PSU sizing
Input Filter Time	1ms (hardware) — suppresses contact bounce and EMI transients
Isolation Voltage	1500V AC (field-to-backplane) — critical for motor-drive environments
Backplane Current Draw	50mA @ 5VDC
Operating Temperature	0–60°C (32–140°F)
Storage Temperature	-40–85°C
Relative Humidity	5–95% non-condensing
Indicators	16 per-point green LEDs — enables field-level fault isolation without software tools
Wiring	Removable terminal block (RTB), 22–14 AWG
Module Keying	Hardware keying prevents wrong-slot insertion
Weight	Approx. 400g
Certifications	UL Listed, CE Marked, CSA Certified, RCM

Why Engineers Specify This Model

• In automotive welding cells, the 1746-IV16 delivers 1500V field-to-backplane isolation because high-frequency weld inverter transients routinely exceed 600V peak, meeting ANSI/RIA R15.06 safety interlock reliability requirements.
• In food packaging lines, the 1746-IV16 delivers 16 inputs per single chassis slot because maximising I/O density reduces enclosure footprint and wiring cost, meeting OMAC PackML integration requirements for compact machine controllers.
• In pharmaceutical batch reactors, the 1746-IV16 delivers deterministic 1ms hardware input filtering because software-filtered inputs introduce scan-cycle jitter that invalidates 21 CFR Part 11 timestamped event logs, meeting FDA process validation documentation requirements.
• In conveyor sortation systems, the 1746-IV16 delivers per-point LED diagnostics because maintenance technicians must isolate photoeye faults in seconds during peak throughput windows, meeting uptime SLA requirements of ≥99.5% OEE.
• In water treatment remote lift stations, the 1746-IV16 delivers 6mA ON-state current draw because low-power field devices and solar PSUs cannot sustain high-current input modules, meeting IEC 60529 IP54 panel power budget constraints.
• In oil & gas ESD systems, the 1746-IV16 delivers UL/CE/CSA multi-certification because SIL-rated safety loops require documented third-party certification for IEC 61511 functional safety assessment, meeting insurance and regulatory audit requirements.

Complete System Bill of Materials

The following components form a complete SLC 500 discrete input acquisition system compatible with the 1746-IV16:

• 1746-IV16 (this module) — 16-point 24VDC sourcing discrete input acquisition
• 1746-A4 / 1746-A7 / 1746-A10 / 1746-A13 — SLC 500 modular chassis (4, 7, 10, or 13 slots); houses the IV16 and processor
• 1747-L532 / 1747-L541 / 1747-L551 — SLC 5/03, 5/04, or 5/05 processor; executes ladder logic reading IV16 input image table
• 1746-P1 / 1746-P2 / 1746-P4 — SLC 500 power supply (2A, 4A, or 10A @ 5VDC); must budget 50mA for each IV16 installed
• 1746-RT25B / 1746-RT32B — Removable terminal block (RTB); field wiring interface for the IV16’s 16 input points
• 1747-UIC — USB-to-DH-485 interface cable; required for RSLogix 500 programming and online diagnostics
• 1756-ENBT / 1747-SCNR — EtherNet/IP or ControlNet scanner (optional); enables remote I/O monitoring via FactoryTalk View
• 24VDC Field Power Supply (e.g., Allen-Bradley 1606-XLP) — powers field sensors connected to IV16 inputs
• Proximity Sensors / Limit Switches / Push-buttons — PNP (sourcing) output field devices wired to IV16 input terminals

Compliance & Industry Standards

• UL Listed (UL 508) — Underwriters Laboratories; confirms the module meets North American industrial control equipment safety standards. Required for UL-labeled panels in the US and Canada.
• CE Marked (Low Voltage Directive 2014/35/EU + EMC Directive 2014/30/EU) — European conformity; mandatory for installation in EU member states and accepted in UK (UKCA equivalent). Confirms EMC immunity per EN 61131-2.
• CSA Certified (C22.2 No. 142) — Canadian Standards Association; required for Canadian electrical inspections and accepted reciprocally in many US jurisdictions.
• RCM Mark — Regulatory Compliance Mark (Australia/New Zealand); confirms compliance with ACMA electromagnetic compatibility requirements for Oceania installations.
• IEC 61131-2 Compliance — International standard for programmable controller equipment; defines input voltage thresholds, noise immunity, and environmental ratings that the 1746-IV16 meets by design.
• RoHS Compliant — Restriction of Hazardous Substances; confirms absence of lead, mercury, cadmium, and other restricted substances. Required for EU import and preferred by ESG-conscious procurement teams globally.

Quality Assurance & Sourcing

Sourcing Channels: Konmask.com sources the 1746-IV16 exclusively through authorised Allen-Bradley distributors, certified surplus dealers with documented chain-of-custody, and direct decommission purchases from verified industrial facilities. We do not source from anonymous brokers or unverified secondary markets.

4-Step Inspection Process:

1. Visual & Physical Inspection — Housing integrity, terminal block condition, label legibility, and hardware keying verification against Rockwell Automation factory specifications.
2. Functional Bench Test — Each input point activated with calibrated 24VDC test signal; LED indicator response and backplane communication verified using SLC 5/05 test rack.
3. Isolation Test — Field-to-backplane isolation resistance measured at 500VDC; must exceed 100MΩ per IEC 61131-2 requirements.
4. Firmware & Revision Verification — Series letter and firmware revision documented and matched to Rockwell Automation product compatibility matrix before shipment.

Documentation Available Upon Request: Test report with per-point results, product photos (all six faces), series/revision label close-up, certificate of conformance, and Rockwell Automation product lifecycle status confirmation.

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, required delivery date, and any revision/series preferences. We respond within 24 business hours.
2. Receive Quote & Inspection Report — We confirm stock availability, provide a firm price in your preferred currency (USD/EUR/HKD/CNY), and share the pre-shipment inspection report and product photos for your approval.
3. Order & Global Delivery — Payment confirmed, we ship via DHL Express, FedEx International Priority, or sea freight for large orders. Export documentation (commercial invoice, packing list, CO, and ECCN classification) included. Typical transit: 3–7 business days to North America/Europe, 1–3 days to Southeast Asia.

Application-Specific FAQ

Q: Can the 1746-IV16 read NPN (sinking) sensors commonly used in Asian machine tool applications?
A: The 1746-IV16 is a sourcing input module designed for PNP (sourcing) field devices. For NPN sinking sensor applications — common in Japanese and Korean machine tool environments — you should specify the 1746-IA16 (120VAC) or use a signal converter. Contact us to confirm the correct module for your sensor type before ordering.

Q: In a conveyor sortation application with 200+ photoeyes, how many 1746-IV16 modules can I install in a single SLC chassis?
A: A 1746-A13 (13-slot chassis) can accommodate up to 12 I/O modules alongside one processor. With 16 inputs per IV16, a fully populated chassis provides 192 discrete input points. For larger sortation systems, multiple chassis linked via ControlNet (1747-SCNR) or EtherNet/IP remote I/O allow thousands of points under a single SLC 5/05 processor.

Q: Is the 1746-IV16 suitable for SIL 2 safety loops in an oil & gas ESD application?
A: The 1746-IV16 is a standard (non-safety-rated) I/O module and is not independently SIL 2 certified. However, it can be used within a SIL-assessed architecture when the overall SLC 500 system is validated per IEC 61511 with appropriate redundancy, proof-test intervals, and PFD calculations. For dedicated safety I/O, consider the Allen-Bradley GuardLogix or Safety I/O platforms. We can advise on the appropriate module for your SIL target — contact our technical team.

---

© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691