Configured for current-sinking DC switching operations in Allen-Bradley PLC-5 racks, the Allen-Bradley 1771-0VN (1771-0VN Digital DC Output Module) provides direct physical/electrical execution across 32 field output channels. It routes external load current from 10-30 VDC field power sources directly to DC ground through solid-state switching elements, delivering precise logic-driven output signals across four galvanically isolated groups of eight points.

Technical Model Nomenclature & Hardware Variants

The 1771-0VN designation defines the hardware architecture within the 1771 Universal I/O platform. The "1771" prefix confirms mechanical alignment with 1771 I/O chassis backplanes. The "0VN" suffix specifies a high-density 32-point sink DC output stage featuring conformal coating for operational resistance against airborne corrosives and harsh industrial atmospheric contaminants.

Operational Hardware Specifications

Backplane Communication & High-Density Logic Execution

The 1771-0VN integrates into backplane bus communication velocity Licences to maintain deterministic I/O state execution across the PLC-5 chassis. System processors scan output image tables and transmit bit patterns across the backplane to drive field switching transistors. Optimized for high I/O density scaling, the 32-point sink output configuration minimizes total slot consumption while preserving firmware flash compatibility and low backplane power draw.

Factory Delivery Package Contents

• 1 x Allen-Bradley 1771-0VN Conformal Coated Output Module
• 1 x Anti-Static Protective Enclosure
• 1 x Mechanical Insertion Keying Kit
• 1 x Factory Inspection Certificate

Wiring Arm & Field Enclosure Setup Instructions

• Power Interruption: Disconnect all backplane power supplies and external 10-30 VDC field power lines before installing or removing the module.
• Keying Band Position: Position mechanical keying bands on the chassis backplane connector between pins 10-12 and pins 26-28 to ensure dedicated slot assignment.
• Wiring Arm Installation: Attach the 1771-WH wiring arm to the chassis pivot bar; terminate sink load connections according to group layout diagrams before swinging the arm into position.
• Conformal Coating Care: Avoid scraping the printed circuit board surface during insertion to preserve the anti-corrosive protective film integrity.

Engineering FAQ & Physical Diagnostics

• What is the maximum output current rating per individual point?

  Each channel supports up to 0.5 A continuous current at 30 VDC, provided total module load does not exceed 8 A across all 32 output channels.

• Does the 1771-0VN operate as a sourcing or sinking device?

  The module operates strictly in a sinking configuration, switching the negative side of the connected DC load circuit directly to power return ground.

• What wiring arm is required to terminate field signals?

  Field conductors terminate onto the 1771-WH 40-terminal wiring arm, allowing module replacement without disturbing field wiring looms.

• How much current does the 1771-0VN draw from the backplane?

  The module draws a constant 330 mA from the 5 VDC chassis backplane supply to power onboard logic and driver electronics.

• What is the typical turn-off signal delay duration for this module?

  The typical turn-off signal delay is rated at 45 ms (+/- 15 ms) under standard operational loading conditions.

• Can this output card be removed under backplane power?

  No, removing or inserting the 1771-0VN while backplane power is active can cause electrical arcing, logic faults, or physical hardware damage.

• What environment protection is applied to this circuit board?

  The 1771-0VN features factory conformal coating to shield internal components against ambient moisture, industrial gases, and dust accumulation.

• How are the 32 outputs organized within the internal circuitry?

  Outputs are divided into four isolated groups of eight outputs, allowing separate DC supply connections for independent circuit branches.