Allen-Bradley 1771-OYL PLC-5 Digital Output Module

The 1771-OYL is an 8-point digital output module designed for Allen-Bradley PLC-5 universal I/O chassis. It features a mixed-contact configuration containing 4 normally open (N.O.) and 4 normally closed (N.O./N.C.) relay outputs, operating at 24 VAC/VDC. This module provides isolated switching capabilities for multi-state industrial control applications requiring hybrid contact arrangements.

Output Configuration and Switching Characteristics

The 1771-OYL divides its 8 output channels into two distinct groups of relay contact configurations, comprising 4 normally open and 4 normally closed contacts. Designed for 24 VAC/VDC circuits, the relay outputs provide electrical isolation between the logic-level backplane and field-actuated devices, protecting sensitive controller hardware from load transients and voltage spikes.

System Installation and Wiring

The module slides directly into any standard slot of an Allen-Bradley 1771 I/O chassis. Field wiring connects through a standard removable terminal block attached to the chassis front, allowing technicians to replace or service the module without disturbing existing field cabling. Physical mechanical keying on the backplane prevents incorrect slot insertion.

Specifications

Frequently Asked Questions

Q: What is the contact breakdown for the Allen-Bradley 1771-OYL output module? A: The module features 8 total output points, split evenly into 4 normally open (N.O.) and 4 normally closed (N.C.) relay contacts.

Q: What operating voltage does this digital output module support? A: The 1771-OYL is rated for 24 VAC/VDC field control circuits.