Allen-Bradley 1771-OW16 PLC 5 Electromechanical Contact Output Module

Configured for executing discrete switching loops across 1771 I/O chassis assemblies, the Allen-Bradley 1771-OW16/B (1771-OW16 Digital Contact Output Module) provides direct physical/electrical execution.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks and I/O Density Scaling

The Allen-Bradley 1771-OW16/B executes command packets processed via modern control layers, including bridges configured for Profinet / EtherNet/IP deterministic networks. The mechanical relay structure provides complete channel-to-channel isolation, preventing current leakage to the field loads. As output counts increase during system expansion, the 1300 mA backplane current load requires strict chassis power budget monitoring to prevent voltage drops. The integrated conformal coating protects the internal traces from conductive airborne particles, preserving data transfer stability across legacy backplanes.

Frequently Asked Questions

Q: How is the contact behavior altered for the 8 selectable output points?

A: The configuration of the 8 selectable contacts is handled via internal hardware jumpers on the module circuit board prior to slot insertion. These can be mapped to establish either Normally Open (N.O.) or Normally Closed (N.C.) base states.

Q: What are the latency limitations when dropping contact commands to the module?

A: The mechanical armature operation induces an inherent physical delay. The typical signal turn-off delay maps to 45 ms (+/- 15 ms) on alternating current loads and 50 ms on direct current loads, with an expected contact bounce duration of 4 ms.

Q: Can this module be hot-swapped while the PLC-5 chassis is actively scanning?

A: No. The 1771 architecture does not support module replacement under backplane power. The main chassis power supply must be deactivated prior to extraction or insertion to prevent logic upsets or high-voltage arcing across the gold-plated backplane connectors.

Field Installation Guidelines

• Chassis Engagement and Seating: Guide the circuit board precisely into the slot tracks of the 1771-A1B through A4B or later chassis. Press the chassis latch firmly over the top edge of the module faceplate to establish a continuous backplane bus connection.
• Wiring Arm Alignment: Terminate all field conductors to the 1771-WN wiring arm. Swing the wiring arm down onto the front edge of the module until the mechanical locking tab snaps securely into place, ensuring consistent electrical contact alignment.
• Inductive Suppression Integration: For high-duty inductive actuators, solenoids, or valve coils, install an external RC snubber network directly across the field device terminals to absorb voltage transients and maximize the 300,000-cycle mechanical contact life.
• Conductor Routing Separation: Segregate all high-voltage field wiring inside the wire ducts. Keep AC power lines physically separated from low-voltage communication cables to prevent electromagnetic coupling from corrupting adjacent processor blocks.