Allen-Bradley 1746-OB32/D – 32-Point 24VDC Source Output Module | SLC 500 Platform
Engineering Background
The SLC 500 family has been a cornerstone of discrete manufacturing automation since the early 1990s. Designed by Rockwell Automation under the Allen-Bradley brand, the SLC 500 backplane architecture delivers deterministic I/O scanning with a proven track record across automotive, food & beverage, material handling, and process industries. The 1746-OB32/D is a high-density DC source output module purpose-built for this platform, offering 32 individually fused output points in a single slot footprint.
Product Positioning
The 1746-OB32/D addresses applications where high channel density, low wiring cost, and reliable 24VDC sourcing are critical. It is the preferred choice for engineers retrofitting legacy SLC 500 systems, expanding existing I/O racks, or maintaining production continuity without migrating to newer platforms. Konmask stocks this module as part of its industrial automation component catalog, serving MRO buyers, system integrators, and OEM rebuild teams globally.
Complete Technical Specifications
- Catalog Number: 1746-OB32/D
- Series: D
- Platform: Allen-Bradley SLC 500
- Module Type: Digital DC Source Output
- Number of Output Points: 32
- Output Voltage Range: 10–50 VDC
- Nominal Output Voltage: 24 VDC
- Output Current per Point: 0.5 A continuous
- Maximum Load Current (Module): 4 A per common group (2 groups of 16)
- Output Type: Sourcing (PNP)
- Backplane Current Draw (5V): 185 mA
- Backplane Current Draw (24V): 0 mA (field-powered)
- Isolation: Optical isolation between backplane logic and field side
- ON-State Voltage Drop: ≤ 1.0 VDC at rated current
- OFF-State Leakage Current: ≤ 1.0 mA
- Output Protection: Electronic short-circuit protection per group
- Wiring Style: Removable terminal block (RTB), 20-pin
- Conductor Size: 14–22 AWG
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: –40 °C to +85 °C
- Relative Humidity: 5–95% non-condensing
- Certifications: UL Listed, CE Marked, CSA Certified
- Slot Width: Single-slot SLC 500 chassis
- Weight: Approx. 0.18 kg
Proven Application Environments
- Automotive Assembly Lines: Solenoid valve control, conveyor drive enable signals, and end-of-line test fixture actuation.
- Food & Beverage Processing: Pump and agitator start/stop, filling valve sequencing, and CIP cycle control.
- Material Handling: Diverter gate control, sorter lane activation, and palletizer zone management.
- Packaging Machinery: Servo drive enable, reject gate actuation, and label applicator triggering.
- Water & Wastewater: Pump station control, valve sequencing, and alarm output signaling.
- MRO & Retrofit Projects: Direct drop-in replacement for worn or failed 1746-OB32 modules in existing SLC 500 racks without program changes.
Engineering Advantages
- High Channel Density: 32 outputs in a single slot reduces rack space consumption and wiring complexity versus dual 16-point modules.
- Sourcing Output Architecture: PNP sourcing outputs are compatible with the majority of modern industrial sensors and actuators, simplifying field wiring.
- Electronic Short-Circuit Protection: Per-group protection prevents cascade failures and eliminates the need for external fusing on individual output circuits.
- Optical Isolation: Galvanic separation between the SLC 500 backplane and field wiring protects the processor from field-side transients and ground loops.
- Removable Terminal Block: RTB design allows module swap without rewiring, minimizing MTTR during unplanned maintenance events.
- Wide Supply Voltage Range: 10–50 VDC field supply tolerance accommodates voltage sag in long cable runs and aging power supplies.
System Architecture & Signal Flow
The 1746-OB32/D occupies a single slot in any SLC 500 fixed or modular chassis (1746-A4 through 1746-A13). The SLC 500 processor writes output image data to the module’s backplane interface on each scan cycle. The module’s internal logic latches the output states and drives the corresponding transistor output circuits via optical isolators. Field power (10–50 VDC) is supplied externally through the RTB commons. Each output point sources current to the connected load when the corresponding image bit is set to 1. The two 16-point groups share independent commons, allowing split-voltage wiring or independent field power fusing per group.
Sourcing & Quality Verification
- Origin: Sourced from authorized distributors, OEM surplus channels, and verified industrial resellers.
- Inspection Protocol: Each unit undergoes visual inspection for physical damage, label authenticity verification, and functional bench testing prior to shipment.
- Firmware/Series Verification: Series revision (D) is confirmed and documented. Mixed-series substitutions are never made without explicit buyer approval.
- Packaging: Shipped in anti-static bags with foam cushioning. Original Rockwell Automation packaging retained where available.
- Traceability: Lot documentation and inspection records available upon request for regulated industries.
Procurement Process
- Inquiry: Submit your requirement via the product page, email support@konmask.com, or WhatsApp/phone +0086 19859288691 with quantity and required delivery date.
- Quote: Konmask responds within 1 business day with pricing, lead time, and stock confirmation.
- Order Confirmation: Purchase order or proforma invoice issued. Payment terms: T/T, PayPal, or trade assurance.
- Quality Check & Dispatch: Module inspected, photographed, and packed. Tracking number provided within 24 hours of shipment.
- After-Sales Support: 12-month warranty against defects. Technical support available for installation and commissioning queries.
Technical FAQ
Q: Is the 1746-OB32/D compatible with all SLC 500 chassis?
A: Yes. It is compatible with all 1746-series chassis (A4, A7, A10, A13) and all SLC 500 processors (SLC 5/01 through SLC 5/05).
Q: Can this module replace a 1746-OB32 (Series A/B/C)?
A: Yes, with the same catalog number base. Series D is the current revision. No program changes are required for direct replacement.
Q: What field power supply is required?
A: An external 24 VDC (10–50 VDC range) power supply rated for the total output load current. The module does not draw field power from the backplane.
Q: Does the module support diagnostics?
A: The 1746-OB32/D provides electronic short-circuit protection with fault reporting to the processor via the backplane status word. No per-point diagnostic LEDs are present; a single group-level indicator is provided.
Q: What is the lead time for out-of-stock units?
A: Typical lead time for sourced units is 3–10 business days. Contact Konmask for current stock status and expedite options.
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