Allen-Bradley 1746-OW16 SLC 500 16-Point Digital Relay Output Module

Description

The Allen-Bradley 1746-OW16 is a high-performance 16-point digital output module designed for the SLC 500 programmable logic controller (PLC) system. This module features electromechanical relay contacts, providing robust isolation and the ability to switch a wide range of AC and DC voltages. With its 16 outputs divided into two isolated groups of eight, it offers significant flexibility for complex control applications, allowing users to manage different voltage types simultaneously without the need for external interposing relays.

Features

• 16 normally open (N.O.) relay contact outputs.
• Two isolated groups of 8 points each, allowing for mixed-voltage operation (AC and DC).
• Wide operating voltage range: 5 to 265V AC and 5 to 125V DC.
• Removable terminal block for simplified field wiring and maintenance.
• Front-panel LED status indicators for quick diagnostic monitoring.
• Dry contact design eliminates the need for intermediary relay circuitry in many applications.

Applications

• Manufacturing and machine automation, including assembly lines and conveyors.
• Water and wastewater processing for control of dosing pumps, valves, and mixers.
• Food, beverage, and packaging equipment such as sorting gates and sealers.
• Building automation systems for lighting, HVAC, and damper control.
• Heavy industrial loops requiring relay isolation.

Technical Specifications

Installation Guidelines

• Slot Selection: The 1746-OW16 can be installed in any available I/O slot of an SLC 500 chassis. Note that Slot 0 is reserved for the processor or remote I/O adapter.
• Handling: Always power down the chassis before inserting or removing any I/O module to prevent electrical damage or system faults.
• Mounting: Align the module's circuit board with the chassis card guides. Slide the module in until the top and bottom locking tabs snap securely into place.
• Wiring: Ensure external fusing is installed for each output to protect the relay contacts from overcurrent or short-circuit conditions, as the module does not include internal fusing.
• Environment: Ensure the installation area is free from excessive vibration and within the specified temperature and humidity ranges.

FAQ

What is the 1746-OW16?

The 1746-OW16 is a 16-point discrete relay output module used with the SLC 500 programmable logic controller family to interface with field devices.

Can I mix AC and DC voltages on the same module?

Yes. Because the 16 channels are split into two groups of 8 with separate common terminals, you can use DC voltage for one group and AC voltage for the other simultaneously.

What is the minimum load current?

The module requires a minimum load current of 10 mA at 5V DC. If the connected device draws less than this, the relay may not switch reliably.