Allen-Bradley 1769-OW16 CompactLogix Relay Output Module

The Allen-Bradley 1769-OW16, also cataloged as the 1769-OW16 Relay Output Module, operates as a dedicated hardware component for switching discrete AC and DC load circuits within CompactLogix and MicroLogix 1500 system platforms.

Hardware Specifications

Backplane Bus & Deterministic Network Execution

The module interfaces directly through the 1769 Compact I/O backplane bus communication velocity framework, establishing deterministic timing execution for output commands generated by the local controller. Internal ASIC logic manages signal decoding across the local bus, transferring command frames to the dual-group output drivers while continuously enforcing channel-to-backplane galvanic isolation. This backplane architecture maintains strict execution stability during high-density I/O bus scaling, ensuring that signal propagation delay remains under 10 ms even under maximum backplane bus current draw limits (205 mA at 5 VDC and 180 mA at 24 VDC). Firmware flash compatibility ensures uniform state handshaking between the module registers and the master processor across demanding scan cycles.

Frequently Asked Questions

Q: What limits apply to the power supply distance rating when installing this module on a 1769 backplane?

A: You must mount the module within 8 bank locations of the system power supply. Exceeding an 8-module distance rating causes voltage drops across the backplane bus logic lines, leading to backplane communication faults or module initialization failures.

Q: Can you mix AC and DC voltages on the same 1769-OW16 module?

A: Yes. The 16 outputs divide into two individually isolated groups of 8 points. You can apply AC operating voltages to one group common and DC operating voltages to the second group common without cross-channel interference, provided you do not exceed 2.5 A per point or 10 A per common.

Field Installation Guidelines

Mount the unit directly onto an IEC standard DIN rail or secure it to a panel backplate using M4 screws. Always verify that the power supply distance rating remains within 8 modules of the system power source before locking the bus levers.

When landing conductors, strip insulation back to specified lengths and use copper wiring rated for at least 90 deg C. Secure solid (22 to 14 AWG) or stranded (22 to 16 AWG) leads into the screw terminal block, applying a strict torque limit of 0.68 N m (6 lb in).

Ensure field wiring runs maintain strict physical separation from high-voltage motor feeds and variable frequency drive outputs. Earth ground connections must terminate directly at the enclosure ground bus using low-impedance grounding straps to preserve channel-to-backplane isolation integrity.