Allen-Bradley 1746-OV8 SLC 500 DC Output Module

1746-OV8 8-Point Sinking Output Module by A-B

Product Introduction

The Allen-Bradley 1746-OV8 is a discrete output module designed for the SLC 500 platform. It provides eight sinking output channels in a single group. These channels operate within a voltage range of 10 to 50V DC. This wide range makes it suitable for various DC loads, including solenoids, relays, and indicator lights.

This module occupies just one slot in any SLC 500 chassis. Its compact design allows for dense I/O configuration. Furthermore, it offers high current capacity per point. Engineers rely on this module for demanding applications that require robust switching performance.

Technical Specifications of the 1746-OV8

The 1746-OV8 delivers consistent and reliable output switching. Its key electrical and performance parameters are outlined below.

Output Characteristics

• Number of Outputs: Eight (8) sinking output channels

• Output Voltage Range: 10 to 50V DC

• Number of Groups: Single group with 8 points per common

• Continuous Current per Point: 1.0A at 30°C (86°F); 0.5A at 60°C (140°F)

• Continuous Current per Module: 8.0A at 30°C; 4.0A at 60°C

• Surge Current per Point: 3.0A for 10 milliseconds

Signal Timing

• Off-to-On Signal Delay: 0.1 ms (resistive load)

• On-to-Off Signal Delay: 1.0 ms (resistive load)

• Step Response: 60 ms in, 2.5 ms out

Power and Leakage

• Backplane Current (5V DC): 135 mA

• Backplane Current (24V DC): 0 mA

• Maximum Off-State Leakage: 1 mA

• Minimum Load Current: 1 mA

• On-State Voltage Drop: 1.2V at 1A

• Maximum Thermal Dissipation: 6.9W

Environmental and Operating Conditions

This module is built for industrial environments. It operates reliably within the following conditions:

• Operating Temperature: 0 to +60°C (+32 to +140°F)

• Storage Temperature: -40 to +85°C (-40 to +185°F)

• Relative Humidity: 5 to 95% without condensation

• Operating Shock: 30g

Agency Certifications and Compliance

The 1746-OV8 meets stringent industry standards. It holds the following certifications:

• UL / C-UL listed for Class I, Division 2, Groups A, B, C, D

• CE marked for all applicable directives

• C-Tick marked for Australian compliance

• Complies with NEMA ICS 2-230 and relevant IEC standards

These approvals ensure safe operation in hazardous locations and global markets.

Installation and Mounting Guidance

The Allen-Bradley 1746-OV8 installs directly into any SLC 500 chassis. It requires a single slot. You can mount it in a local rack, extension rack, or distributed I/O station.

Wiring and Terminal Features

• Color-coded removable terminal blocks simplify wiring.

• Self-lifting pressure plates accept up to two 14 AWG (2 mm²) wires.

• For easier wiring, you may use a pre-wired cable with a 1492 interface module.

Important Installation Notes
Ensure the module is installed in a clean and dry environment. Keep the area free from metal fragments before applying power. Also, refer to Allen-Bradley's grounding guidelines for proper panel mounting.

LED Status Indicators

Front-panel LED indicators display the status of each output point. These lights provide immediate visual feedback. Consequently, troubleshooting and maintenance become much faster and easier.

Application Flexibility and System Integration

This module supports various DC loads. Its high current rating makes it ideal for driving actuators, valves, and motor starters. Moreover, it works seamlessly with SLC 500 processors. There is no fixed limit to the number of 1746-OV8 modules you can install. The only limitations are:

• Processor memory and I/O capacity

• Number of available racks and slots in the chassis

This flexibility allows you to scale your system as needed.

Performance Advantages

The 1746-OV8 offers fast switching speeds. Its 0.1 ms turn-on delay ensures precise control timing. Meanwhile, the low off-state leakage prevents unintended device activation. These features contribute to reliable and predictable machine operation.

Packaging List

Your package for the 1746-OV8 includes the following items:

• One Allen-Bradley 1746-OV8 Discrete Output Module

• One removable terminal block (color-coded)

• Installation and wiring instructions sheet

Shipping Information

We ship all orders promptly using trusted global carriers. Our standard shipping partners include FedEx, UPS, and DHL. Tracking information will be provided upon dispatch.

Frequently Asked Questions (FAQ)

1. What type of output does the 1746-OV8 provide?
The 1746-OV8 provides eight sinking DC outputs. It operates within a 10-50V DC range and switches loads to the DC common.

2. How much current can each output handle?
Each output supports 1.0A continuously at 30°C. At 60°C, the rating derates to 0.5A per point. The module also handles a 3.0A surge for 10 ms.

3. Which controllers are compatible with the 1746-OV8?
This module is part of the SLC 500 family. It works with any SLC 500 processor that supports local or remote I/O expansion.

4. What is the signal delay for this output module?
The Off-to-On delay is 0.1 ms. The On-to-Off delay is 1.0 ms when used with a resistive load. These fast response times suit precision control applications.

5. Can I install multiple 1746-OV8 modules in one system?
Yes, you can install as many as needed. The total number is limited only by the processor's I/O capacity and the available physical slots in the chassis.