Allen-Bradley 1746-OW16 SLC 500 Relay Module

1746-OW16 SLC 500 Relay Output Module Overview

The Allen-Bradley 1746-OW16 offers exceptional flexibility for discrete output control. This module belongs to the trusted SLC 500 family and provides sixteen normally open relay contact outputs. Consequently, it allows you to switch both AC and DC loads without additional interposing circuitry.

Specifically, this 1746-OW16 module supports an operating voltage range of 5-265 VAC or 5-125 VDC. Therefore, it is perfectly suited for mixed-voltage applications. Furthermore, the module is organized into two isolated groups with eight outputs per common terminal. This arrangement allows one group to operate with AC voltage while the other handles DC voltage simultaneously.

Key Technical Specifications

The 1746-OW16 is engineered for versatility and reliable switching. Its relay contacts provide true dry contact isolation between the control logic and field devices.

• Outputs: 16 (Normally Open relay contacts)

• Number of Groups: 2 (8 points per common)

• Operating Voltage (AC): 5-265 VAC

• Operating Voltage (DC): 5-125 VDC

• Current per Output (120 VAC): 1.5 A (break), 15 A (make)

• Current per Output (240 VAC): 0.75 A (break), 7.5 A (make)

• Current per Output (24 VDC): 2.0 A continuous

• Current per Output (125 VDC): 1.2 A continuous

• Continuous Current per Module (Max): 16 A (limited to 1440VA)

• Backplane Current Draw: 170-180 mA at 5 VDC

• Signal Delay (ON and OFF): 10.0 ms (max resistive load)

• Thermal Dissipation (Total): 5.7 W maximum

• Minimum Load Current: 10 mA at 5 VDC

Moreover, the relay contacts have a maximum on-state resistance that ensures efficient power delivery. Additionally, the module's step response is rated at 60 ms in and 2.5 ms out.

Mechanical and Environmental Parameters

This SLC 500 relay module is built for reliable operation in standard industrial environments. It operates within a temperature range of 0 to 60°C. However, please protect the module from chemical exposure, as certain chemicals may degrade the sealing materials. Periodically inspect the unit for any signs of chemical damage. Furthermore, we strongly recommend installing external surge suppression devices across each output channel. This practice protects the relay contacts from voltage spikes and significantly extends the module's service life.

Installation and Wiring Guidelines

Installing the 1746-OW16 is straightforward and convenient. It occupies just one slot in any SLC 500 chassis. The module includes a removable terminal block (RTB) that simplifies wiring. You can detach the RTB, wire your field cables and jumpers at your bench, and then reattach it to the module. Consequently, this design reduces installation time and simplifies future maintenance.

For secure connections, use the sliding latches, screws, or threaded connectors provided with the module. Always ensure that the total module power does not exceed 1440VA. This limitation prevents overheating and ensures reliable long-term operation.

Applications

The 1746-OW16 is particularly valuable in systems with mixed voltage requirements. Common use cases include controlling AC motor contactors, managing DC solenoid valves, and switching indicator lights of different voltage levels. Additionally, its isolated relay contacts allow one group to control 120VAC loads while the other group handles 24VDC devices. This eliminates the need for costly interposing relays. Therefore, it is a popular choice among system integrators and panel builders.

Packaging List

Your shipment for the Allen-Bradley 1746-OW16 will include the following items:

• (1) 1746-OW16 SLC 500 relay output module

• (1) Removable terminal block (pre-installed)

Shipping Information

We ship all orders via FedEx, UPS, or DHL. Tracking numbers are provided upon dispatch. All items are carefully packaged to prevent damage during transit.

Frequently Asked Questions (FAQ)

1. Can the 1746-OW16 switch both AC and DC loads?
Yes. The 1746-OW16 supports AC voltages from 5 to 265 VAC and DC voltages from 5 to 125 VDC. Each output group can operate with different voltage types, providing excellent application flexibility.

2. What is the difference between the two output groups?
The 1746-OW16 has two isolated groups with eight outputs per common terminal. This allows one group to handle AC loads while the other handles DC loads. Alternatively, both groups can use the same voltage type for higher total capacity.

3. Does the module include surge protection?
No, the 1746-OW16 does not include built-in surge suppression. To protect the relay contacts from inductive load spikes, we strongly recommend installing external suppression devices (such as varistors or RC snubbers) across each output channel.

4. What is the maximum continuous current per module?
The maximum continuous current per module is 16 A. However, you must ensure that the total module power does not exceed 1440VA. For example, at 240VAC, the total current should be limited to 6A (1440VA / 240V).

5. How do I wire the 1746-OW16 module?
The module includes a removable terminal block for easy wiring. Simply detach the RTB, connect your field wires using screw-clamp terminals, then reattach it to the module. Use the sliding latches or screws to secure the connection firmly.