One Factory Sealed Allen Bradley Micrologix 16 point Output Model 1762-OW16 1762OW16 1762-0W16

Allen-Bradley 1762-OW16 | MicroLogix 1200 16-Point AC/DC Relay Output Module — Class 1 Div 2 / 2.5A/Point / IP20

16 Relay Outputs for Mixed AC and DC Field Loads

The 1762-OW16 expands a MicroLogix controller's output capability with 16 Form A relay contacts. Each relay is independently isolated — each contact switches the field load at its own voltage, which can be AC or DC within the rated range. One group of 8 can switch 24V DC contactors while the adjacent group switches 120V AC solenoids, all on the same module. This flexibility eliminates the need for separate transistor and relay output modules in panels where both AC and DC field loads coexist.

Two groups of 8 outputs share a common terminal within each group. The per-group limit of 8 Amps caps the total simultaneous current draw across any group of 8 outputs — four outputs at 2A each, or any combination totalling 8A. Calculate worst-case simultaneous load current per group during panel design and confirm it stays within this limit.

The 10ms on/off signal delay is characteristic of relay output modules and is inherent to the mechanical relay contact closure and release time. For loads that require faster switching, transistor output modules (1762-OB16 or similar) are appropriate.

Key Specifications

Class 1, Division 2 — Hazardous Area Compliance

The 1762-OW16 carries Class 1, Division 2 (C1D2) hazardous location approval — confirming it is suitable for installation in environments where flammable gases or vapours may be present under abnormal conditions. C1D2 approval is relevant for oil and gas, chemical processing, and similar industries where panel-level I/O expansion modules may need to be installed in or adjacent to classified areas. Confirm compliance requirements against the specific zone classification of the installation before specifying.

FAQ

Q1: What MicroLogix controllers is the 1762-OW16 compatible with?

The 1762-OW16 is compatible with MicroLogix 1100, 1200, and 1400 controllers via the 1762 expansion bus. The MicroLogix 1200 supports up to six 1762-series expansion modules; check the controller's documentation for the maximum number of modules and total expansion I/O in your specific configuration.

Q2: Can the two output groups operate at different voltages?

Yes. Each group has its own common terminal — Group 1 (outputs 0–7) and Group 2 (outputs 8–15) are electrically isolated from each other at the common. This allows one group to switch 24V DC loads while the other switches 120V AC loads simultaneously from the same module.

Q3: The output appears to activate (relay clicks) but the field load does not respond. What should be checked?

Verify the field supply voltage is present at the common terminal of the relevant group. Check that the wiring connects from the common through the field load to the relay contact output terminal. The relay's mechanical contact closure can be confirmed with a continuity tester across the output terminal and common when the PLC output is forced on.

Q4: What is the expected relay contact life on the 1762-OW16?

The electrical relay life specification is a minimum of 100,000 operations at rated load. Contact wear rate increases with higher switched currents — outputs driving full 2.5A loads cycle faster through contact material. For outputs that switch at high frequency, consider transistor output modules where the application allows DC loads.

Q5: Does removing the 1762-OW16 with power on damage the module?

Yes. Rockwell explicitly warns against removing or installing 1762 modules with power applied. An arc can occur that sends erroneous signals to field devices, causes damage in a hazardous environment, or permanently damages the module's circuitry. Always remove system power before inserting or removing this module.