Allen-Bradley 1746-OW4 Digital Contact Output Module

Manufacturer

Allen Bradley

Category

PLCs

Product Line

SLC 500

Part Number

1746-OW4

GTIN

10662073578892

Weight

3.81 lbs (1.73 kg)

Module Type

Digital Contact Output Module

Operating Voltage

5-265 Volt AC or 5-125 Volts DC

Outputs

4

Output Types

N.O. Relay Contact

Current/Output (120 VAC)

1.5 amps

Current/Output (24VDC)

1.2 amps

Backplane Current

45 milliamps

Applications

Relay Contact Outputs

Step Response

60 milliseconds in, 2.5 milliseconds out

1. Disconnect power.

2. Align the circuit board of module with the chassis card guide. (A)

3. Slide the module into the chassis until the bottom tabs lock into place. (B)

4. Route the wires down and away from the module, securing them with the wire tie. (C)

5. Cover all unused slots with Card Slot Filler, catalog number 1746-N2, to keep the chassis free from debris.

6. To remove the module, press and hold the module release located on each self-locking tab, and slide the module out of the chassis slot. (D)

Q1: How does the AB 1746-OW4 leverage relay-based output architecture to accommodate heterogeneous voltage switching requirements within SLC 500 control systems?
A: The AB 1746-OW4 utilizes four individually isolated relay outputs, enabling it to switch both AC and DC loads across a wide voltage range, making it highly versatile for diverse industrial applications.

Q2: Why is the AB 1746-OW4 particularly advantageous when galvanic separation between field devices and controller circuitry is a critical design consideration?
A: The relay contacts of the AB 1746-OW4 provide electrical isolation between the control logic and the connected load circuits, helping protect sensitive controller components from electrical disturbances.

Q3: What operational factors should engineers evaluate when deploying the AB 1746-OW4 for inductive load management in demanding automation environments?
A: When using the AB 1746-OW4 with inductive devices such as contactors, relays, and solenoids, engineers should consider contact ratings, switching frequency, and the use of suppression devices to maximize relay life expectancy.

Q4: In what ways does the AB 1746-OW4 enhance system integration flexibility compared with semiconductor-based output modules?
A: Unlike transistor or triac outputs, the AB 1746-OW4 can control both AC and DC circuits through dry-contact relay outputs, offering greater compatibility with legacy equipment and mixed-voltage field installations.

Q5: How can the diagnostic indicators incorporated into the AB 1746-OW4 streamline maintenance procedures and improve system uptime?
A: The AB 1746-OW4 features dedicated output status LEDs that provide immediate visual confirmation of channel activity, allowing maintenance personnel to quickly identify operational states and troubleshoot field connections efficiently.

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