Allen-Bradley 1746-OW16 SLC 500 Relay Output Module

Product Description

The 1746-OW16 from Allen-Bradley is a 16-channel relay output module developed for the SLC 500 platform. It is designed to control both AC and DC field devices through mechanically isolated relay contacts, offering flexibility for mixed-voltage applications.

Each output operates as a normally open contact, grouped into two commons (8 points per common), allowing segmented load control within a single module. This design supports a wide voltage range and makes the module suitable for switching inductive and resistive loads such as solenoids, relays, motor starters, and indicator devices.

The 1746-OW16 is rack-mounted within an SLC 500 chassis and communicates via the system backplane, ensuring reliable coordination with the controller and other I/O modules.

Key Technical Specifications

Output Configuration

• Number of Outputs: 16 relay channels

• Contact Type: Normally Open (NO)

• Points per Common: 8

Electrical Ratings

• Switching Voltage Range:

• 5–125V DC

• 5–250V AC

• Minimum Load Current: 10 mA @ 5V DC

• Continuous Current Capacity:

• 16 A per module

• 8 A per common group

• Off-State Leakage Current: 0 mA

Timing Characteristics

• Turn-On Delay: max. 10 ms

• Turn-Off Delay: max. 10 ms

Backplane Requirements

• Current Consumption:

• 0.17 A @ 5V DC

• 0.18 A @ 24V DC

Power and Thermal Data

• Power Dissipation per Point: approx. 0.033 W

• Total Module Dissipation: approx. 5.2 W

Mechanical Details

• Mounting: SLC 500 chassis (rack-mounted)

• Terminal Type: Screw-clamp terminals

• Status Indication: LED per output channel

• Weight: 0.45 kg

Functional Features

• Relay-based outputs for AC/DC load compatibility

• Electrical isolation between control logic and field devices

• Dual common grouping for flexible wiring

• Suitable for both low-level and high-voltage switching

Applications

• Control of contactors and motor starters

• Switching of AC/DC solenoids and valves

• Alarm and signaling systems

• General-purpose industrial output control

FAQ

Q: Can this module switch both AC and DC loads?
A: Yes, the relay contacts support both AC and DC voltages within the specified ranges.

Q: Are the outputs isolated?
A: The outputs are relay-isolated from the backplane, but channels within a common share the same reference.

Q: What is the advantage of relay outputs compared to transistor outputs?
A: Relay outputs allow switching of higher voltages and both AC/DC loads, making them more versatile for mixed applications.