Product Overview

The Allen-Bradley 1746-OW16 serves as a versatile interface for the SLC 500 controller series, providing 16 high-reliability electromechanical relay outputs. This module allows the simultaneous control of varied load types, including AC solenoids and DC indicators, within a single chassis slot. We supply this unit as 100% Brand New and Original in Factory Packing, offering a robust solution for systems requiring physical dry-contact isolation between logic and field power.

Technical Specifications

Engineering Advantages

• Universal Load Compatibility: The 1746-OW16 controls both AC and DC field devices. This flexibility eliminates the need for separate sourcing and sinking modules, simplifying spare parts inventory and cabinet design.

• Superior Galvanic Isolation: Mechanical relay contacts provide physical separation between the SLC backplane and high-voltage field transients. This protects the CPU and adjacent modules from electrical noise and surges common in motor control centers.

• Zero Leakage Current: Unlike solid-state triac or transistor modules, the electromechanical contacts in the 1746-OW16 exhibit zero off-state leakage. This ensures that high-impedance loads, such as LED indicators or small relays, turn off completely every time.

• High Power Handling: The module supports up to 2 Amperes per point. This capacity allows for the direct driving of larger contactors and solenoids without the cost and space requirements of interposing relays.

• Mixed Voltage Support: Because the relay contacts are "dry," you can mix different voltages across different output groups in the same module (within the limits of the common terminals), offering unprecedented wiring flexibility.

FAQs

Can I replace a 1746-OW8 with a 1746-OW16?

Yes, the 1746-OW16 provides the same relay functionality but doubles the output density from 8 to 16 points. You must update your processor's I/O configuration in RSLogix 500 and verify that your wiring harness matches the 16-point terminal block layout.

What is the life expectancy of the relay contacts?

Mechanical life typically exceeds 10,000,000 cycles. However, electrical life depends on the load type (inductive vs. resistive) and the current draw. Using surge suppressors (RC networks for AC, diodes for DC) across inductive loads significantly extends contact life.

Why does the module show 0.0 A draw on the 24V DC backplane in some specs?

The 1746-OW16 Series C and later primarily draw their relay coil power from the 24V DC backplane (approx. 90 mA when all relays are energized). Always ensure your SLC power supply (e.g., 1746-P1 or P2) has sufficient 24V capacity to support the number of relay modules installed.

Is this module suitable for high-speed switching?

No. Mechanical relays have inherent turn-on and turn-off delays (typically 10-20 ms). For high-speed applications or PWM control, use transistor (1746-OB16) or triac (1746-OA16) solid-state modules instead.