Allen Bradley 1771-OC PLC 5 Conformal Coated Digital DC Output Module

Product Overview

The Allen Bradley 1771-OC functions as a heavy-duty, sourcing digital DC output module within the legacy PLC 5 architecture. This hardware drives high-amperage field loads including solenoids, DC motor starters, indicators, and control relays directly from the controller backplane. Factory-applied conformal coating enhances internal circuit defense against ambient contamination. Although the manufacturer classifies the PLC 5 series as an earlier legacy line, we supply this critical module in 100% brand new, original factory condition to keep your legacy processing lines running without forcing a complete system redesign.

Technical Specifications

Engineering Advantages

• Corrosion Isolation via Conformal Coating: Factory-applied conformal coating covers all internal printed circuit boards. This protective layer repels humidity, conductive carbon dust, and chemical vapor droplets, preventing parasitic trace leakage in aggressive settings like paper mills, refineries, and wastewater facilities.

• High Current Source Driving: Each independent output channel delivers up to 1.5A of continuous sourcing current at 42–53V DC. This eliminates the need for external interposing relays when switching heavy DC induction coils or large pneumatic valves, reducing control cabinet heat generation and physical component density.

• Pre-Wired Maintenance via 1771-WH Arm: The module utilizes the detachable 1771-WH wiring arm interface. Field technicians replace faulty or worn hardware by sliding the old module out and inserting this brand new unit into the chassis slot without disconnecting a single field wire termination.

• Flexible Data Format Parsing: The internal microprocessor accepts both BCD and Natural Binary data formats directly from the PLC 5 processor backplane. This dual capability allows compatibility with legacy application programs, eliminating the need to rewrite complex output logic parameters.

FAQs

• Does this 1771-OC output module arrive with the original factory seals?

  Yes. We guarantee this product arrives in 100% brand new, original factory packaging. The unit remains sealed inside its factory anti-static bag with all original Allen Bradley box labels, tracking stickers, and quality control markings intact.

• What is the mechanical difference between a sourcing module and a sinking module?

  The 1771-OC operates as a sourcing module. When an output channel activates, the module supplies positive voltage (+V DC) from the field power supply terminal directly to the field load. The field device must connect directly back to the common return line (-V DC) to complete the circuit path.

• Can I insert this module into a live PLC 5 chassis without shutting down the system?

  No. The PLC 5 platform does not support Hot Swapping (RIUP - Removal and Insertion Under Power). You must completely isolate the chassis power supply and turn off all external field power before inserting or removing the 1771-OC module to avoid backplane arcing or logic corruption.

• Does this product include the 1771-WH wiring arm assembly?

  No. Allen Bradley ships the 1771-WH wiring arm separately from the I/O module. If your current system installation already uses a 1771-WH arm, you can reuse that existing arm directly with this brand new module.