Allen-Bradley 1746-OBP16 High Current Sourcing DC Output Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1746-OBP16 is a 16-point, high-current sourcing DC output module designed for the SLC 500 programmable controller platform. It delivers robust 24 VDC sourcing outputs capable of handling high-inrush loads such as solenoids, contactors, and DC motor starters — making it a workhorse in discrete manufacturing and process automation environments.
Whether you are sourcing an OEM replacement, evaluating a functional equivalent, or comparing cross-brand substitute modules, this guide provides the technical depth needed to make a confident selection decision.
Technical Specifications
| Model | 1746-OBP16 |
| Brand | Allen-Bradley (Rockwell Automation) |
| Platform | SLC 500 |
| Output Type | Sourcing (PNP), DC |
| Number of Outputs | 16 points |
| Output Voltage Range | 10–50 VDC |
| Output Current (per point) | 2.0 A continuous ⚡ (key replacement parameter) |
| Output Current (per module) | 8.0 A max |
| Inrush Current | 7.0 A for 10 ms ⚡ (key replacement parameter) |
| Backplane Current (5 VDC) | 185 mA |
| Backplane Current (24 VDC) | 0 mA |
| Output Isolation | Optical isolation, 1500 VAC |
| Leakage Current | 1.0 mA max |
| Voltage Drop (ON state) | 1.0 V max |
| Response Time (OFF→ON) | 0.1 ms |
| Response Time (ON→OFF) | 1.0 ms |
| Operating Temperature | 0–60°C |
| Wiring | Screw terminal, 1 common per 8 outputs |
| Slot Width | Single-slot SLC 500 I/O chassis |
| Certifications | UL, CSA, CE, C-Tick |
Compatible Replacement & Equivalent Models
When evaluating a replacement or equivalent for the 1746-OBP16, three categories apply. Always verify backplane compatibility, output current rating, and wiring configuration before substitution.
① Direct Drop-in Replacements (Same Platform)
- 1746-OBP16 (new/refurbished) — Identical form, fit, and function. Zero configuration change required.
- 1746-OBP16E — Enhanced version with diagnostic LED per point; fully backward compatible in SLC 500 chassis. Preferred upgrade path.
② Functional Equivalents (Same Platform, Different Point Count)
- 1746-OBP8 — 8-point sourcing DC output, same 2 A/point rating. Use when only 8 outputs are needed; frees a slot for expansion.
- 1746-OB16 — 16-point sourcing DC output, 0.5 A/point. Not suitable for high-inrush loads; verify load current before substituting.
- 1746-OB32 — 32-point sourcing DC output, 0.5 A/point. Suitable only for low-current loads; requires chassis slot availability check.
③ Cross-Brand Alternatives (Non-Rockwell)
- Siemens 6ES7 322-1BL00-0AA0 (S7-300 SM 322) — 16-point sourcing DC output, 0.5 A/point. Requires migration to S7-300 platform; not a plug-in substitute.
- Mitsubishi QY10 (Q-Series) — 16-point transistor sourcing output, 0.5 A/point. Platform migration required.
- Omron CJ1W-OD212 — 16-point PNP output, 0.5 A/point. Compatible with CJ1/CJ2 series only.
⚠️ Cross-brand alternatives require full platform migration and are not electrically interchangeable with SLC 500 chassis.
Why Choose the Original 1746-OBP16
- 🎯 Precision-rated for high-inrush loads — 7 A inrush for 10 ms ensures reliable switching of solenoids and contactors without nuisance trips.
- ✅ Multi-agency certified — UL, CSA, CE, and C-Tick certifications satisfy global compliance requirements out of the box.
- 🔌 Guaranteed SLC 500 backplane compatibility — Engineered to Rockwell’s exact electrical and mechanical specifications; no compatibility risk.
- 🛠️ Full Rockwell TechConnect support — Access to firmware, EDS files, and factory-level technical support throughout the product lifecycle.
- 🏷️ Manufacturer warranty — Covered under Rockwell Automation’s standard hardware warranty with traceable serial numbers.
- 📦 Immediate drop-in installation — No re-programming, no wiring changes, no chassis modification required when replacing like-for-like.
Typical Applications
- 🏭 Automotive assembly lines — Controlling pneumatic cylinders, clamps, and solenoid valves on body-in-white and powertrain lines.
- 🥤 Food & beverage packaging — Driving conveyor diverters, filling valves, and labeling actuators in hygienic environments.
- 💊 Pharmaceutical batch processing — Switching dosing pumps and isolation valves in validated GMP production systems.
- 🛢️ Oil & gas wellhead control — Operating high-inrush solenoid-operated safety valves in remote RTU panels.
- 🏗️ Material handling & palletizing — Controlling DC motor starters and brake coils on robotic palletizer cells.
- ⚡ Power distribution switchgear — Driving contactor coils and indicator lamps in MCC (Motor Control Center) panels.
System Compatibility
The 1746-OBP16 is compatible with the following SLC 500 system components:
- 1746-A4 / A7 / A10 / A13 — SLC 500 I/O chassis (4, 7, 10, 13 slots)
- 1747-L20 / L30 / L40 / L553 — SLC 5/02, 5/03, 5/04, 5/05 processors
- 1746-P1 / P2 / P3 / P4 — SLC 500 power supplies
- 1746-HSCE / HSRV — High-speed counter and servo modules (same chassis)
- 1747-SDN — DeviceNet scanner for networked I/O expansion
- 1747-UIC — USB-to-DH485 interface for RSLogix 500 programming
Selection Guide
Answer these three questions to confirm the 1746-OBP16 — or its equivalent — is the right fit for your application:
- Is your chassis SLC 500? The 1746-OBP16 is exclusively compatible with SLC 500 I/O chassis. If you are running ControlLogix or CompactLogix, you need a 1756-OB or 1769-OB series module instead. Contact Konmask for cross-platform selection assistance.
- Does your load exceed 0.5 A per output point? If yes, the standard 1746-OB16 is insufficient — the OBP16’s 2 A/point rating is required. Confirm your solenoid or contactor coil current draw before ordering an equivalent.
- Do you need sourcing (PNP) or sinking (NPN) outputs? The 1746-OBP16 is a sourcing module. If your field devices require sinking outputs, consider the 1746-OB16E (sinking) instead. Contact Konmask to verify wiring polarity compatibility.
Quality Assurance & Sourcing
Konmask sources 1746-OBP16 modules through authorized distribution channels and verified secondary market suppliers with full traceability. Every unit undergoes a 4-step inspection process before shipment:
- Visual & mechanical inspection — Connector integrity, PCB condition, label authenticity, and housing check.
- Functional power-on test — All 16 output points verified under load using calibrated test fixtures.
- Firmware & revision verification — Series letter and firmware revision confirmed against Rockwell’s published compatibility matrix.
- ESD-safe packaging & documentation — Shipped in anti-static packaging with test report, datasheet, and certificate of conformance available on request.
Available documentation: Test Report | Certificate of Conformance | Datasheet | Customs HS Code Declaration
How to Order
- 📧 Submit your inquiry — Email support@konmask.com or call +0086 19859288691 with your model number, quantity, and required delivery date.
- 📋 Receive a quote — Konmask will confirm availability, pricing, lead time, and compatible equivalent options within 24 hours.
- 🚚 Confirm & ship — Upon order confirmation, modules are inspected, packed, and dispatched with full tracking and documentation.
Replacement & Compatibility FAQ
Q: Can the 1746-OBP16E replace the 1746-OBP16 directly?
A: Yes. The 1746-OBP16E is a direct drop-in replacement with identical electrical specifications and the same SLC 500 slot footprint. The only difference is per-point diagnostic LEDs on the E-series. No wiring or programming changes are required.
Q: Is the 1746-OB16 a compatible equivalent to the 1746-OBP16?
A: Only for low-current loads. The 1746-OB16 is rated at 0.5 A/point versus the OBP16’s 2 A/point. It is not a compatible equivalent for solenoid or contactor applications. Using it as a substitute on high-inrush loads will cause premature output failure.
Q: Are Siemens or Mitsubishi modules a valid substitute for the 1746-OBP16?
A: No — not as a plug-in substitute. Cross-brand modules such as the Siemens SM 322 or Mitsubishi QY10 require a full PLC platform migration and are electrically incompatible with the SLC 500 backplane. They may be considered as alternatives only in a full system redesign context. Contact Konmask for migration feasibility assessment.
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