Allen-Bradley 1746-IB8 — Eight-point DC digital input module | Discontinued Legacy SLC 500

Allen-Bradley 1746-IB8 — Discontinued Eight-point DC digital input module

The Allen-Bradley 1746-IB8 is a manufacturer-confirmed discontinued eight-point dc digital input module associated with the long-established SLC 500 automation platform. This exact catalog number appears in Rockwell Automation lifecycle materials as discontinued and no longer available for manufacturer sale. Corwin Solutions presents it for maintenance teams and industrial buyers seeking exact-model replacement sourcing. The page does not claim that Corwin has stock, guarantees a lead time, or offers an authorized OEM supply channel. Production systems can depend on specific revisions and wiring, making identification as important as obtaining a unit.

Technical Details and Product Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation
• Manufacturer catalog number: 1746-IB8
• Product family: 1746/1747 SLC 500 legacy automation equipment
• Component type: Eight-point DC digital input module
• Product lifecycle: Discontinued — manufacturer-confirmed
• Function: Eight-point direct-current input module for SLC 500 control racks
• Application verification: Confirm sink/source polarity, nominal input voltage and common wiring with original documentation
• Intended platform: Existing compatible SLC 500 control systems; confirm exact application
• Supply status: Independent-source availability not verified; request a quote
• Condition options: Subject to supplier confirmation: sealed surplus, unused surplus, tested used or refurbished

Function and System Identification

The 1746-IB8 is identified as eight-point direct-current input module for slc 500 control racks. For equipment already installed in a panel, identify the full catalog code, hardware or series letter, electrical markings and required connection details. Confirm sink/source polarity, nominal input voltage and common wiring with original documentation. Input and output modules can be different even when the appearance and general catalog family are alike. Confirm signal voltage, current, I/O arrangement and controller compatibility against applicable Rockwell documentation before committing a spare to service. These specifications describe the product family and documented configuration; machine-specific compatibility has not been independently tested by Corwin Solutions.

Typical Industrial Applications

• Restoring older factory machinery where the original SLC 500 hardware remains installed.
• Unplanned shutdown response when a failed module or accessory requires a matching spare.
• Maintaining packaging equipment, material handling systems and process control cabinets with legacy PLC architecture.
• Planning maintenance inventories for facilities awaiting a phased controller or I/O platform modernization.

Discontinued and Legacy Sourcing Notes

Rockwell Automation identifies this catalog number as discontinued. Reference: https://www.rockwellautomation.com/en-mde/products/hardware/i-o/1746-slc-i-o.html. Manufacturer discontinuation should not be confused with complete unavailability in the independent market. Some sellers may carry genuine unused surplus stock, while others offer refurbished or previously installed parts. All possible sources must be verified for physical possession, correct model and revision, authenticity, testing or return conditions and logistics. Third-party advertisements do not establish firm inventory or a reliable acquisition price. For older modules, ask about connector blocks, terminal covers and other installation accessories, which may or may not be included.

Replacement and Compatibility Notes

The ordering number 1746-IB8 should be treated as the baseline for an exact-match request. An alternative part can require changes to controller configuration, rack assignments, logic, power supplies, software or field wiring; migration to newer CompactLogix and Compact 5000 families is an engineering project rather than a guaranteed direct substitution. Confirm sink/source polarity, nominal input voltage and common wiring with original documentation. A qualified controls specialist should evaluate all proposed replacements, particularly when production safety, isolation, or critical control signals are involved. Neither an adjacent catalog number nor a physically similar terminal is evidence of compatibility.

Request a Quote from Corwin Solutions

Send us the manufacturer part number, quantity, delivery destination and required timing. Include label photographs and any necessary series, firmware, condition or package requirements. Tell us whether refurbished and tested used parts are permitted, or only new surplus will be accepted. We can investigate potential supply sources and prepare a quotation after verifying the offered item, condition, availability, price and freight requirements. There is no standing inventory commitment. Pricing, warranty, provenance and lead time must be confirmed individually with the proposed supplier before an order is accepted.