Product Overview of the Allen-Bradley 1794-OV16

The Allen-Bradley 1794-OV16 is a Flex I/O 1794 series digital output module. Specifically, it comes with 16 sinking outputs rated at 24 Volts DC nominal voltage. This module provides reliable control for DC load applications. The 1794-OV16 is an open-style module with an IP20 environmental protection rating. Therefore, it prevents contact with hazardous parts while allowing proper airflow. You can mount this module easily on a standard DIN rail. Consequently, installation requires minimal tools and effort.

Key Technical Specifications of the 1794-OV16

First, let us examine the output characteristics in detail. The 1794-OV16 provides 16 sinking outputs for DC load control. The nominal on-state voltage is 24V DC for standard operation. Furthermore, the on-state output voltage range spans from 10 to 31.2 Volts DC. Each channel delivers a maximum on-state current of 500mA. The total output current rating for the module reaches 8.0A maximum. Therefore, this module handles multiple loads simultaneously with ease.

The off-state leakage current is just 0.5mA maximum per channel. As a result, the 1794-OV16 effectively isolates loads when turned off. The on-state voltage drop reaches a maximum of only 0.2V DC. This low drop ensures efficient power delivery to your field devices. The off-state maximum voltage is 31.2V DC for safe operation.

Output Signal Delay Performance

The output signal delay varies by switching direction. Off-to-On delay takes only 0.5 milliseconds for fast response. On-to-Off delay takes a maximum of 1.0 milliseconds for reliable turn-off. Therefore, the 1794-OV16 suits applications requiring quick output switching. This performance ensures precise control of your automated processes.

Electrical and Power Specifications

The 1794-OV16 draws a Flexbus current of 80mA at 5V DC. The external power supply requires 10 to 31.2 Volts DC with a 5% AC ripple. External current draw ranges from 20 to 65mA for the module logic. Maximum power dissipation reaches 4.2W at 31.2 Volts DC. Likewise, maximum thermal dissipation is 14.3 BTU/hr. at 31.2 Volts DC. Consequently, this module operates efficiently without excessive heat buildup.

Hot-Swapping Capability for Easy Maintenance

The 1794-OV16 supports module removal and insertion under power. This is possible because the I/O module has no direct wiring. As a result, you save valuable time during system maintenance. Furthermore, there is no need to restart the entire system after module replacement. This feature eliminates system restarting inefficiency completely. Consequently, your production uptime improves significantly with the 1794-OV16.

Compatible Terminal Base Units

The 1794-OV16 works with two specific terminal base units. These include the 1794-TB3 for standard wiring applications. Additionally, it works with the 1794-TB3S for spring-clamp connections. Always select the correct base for your wiring preference. The terminal base mounts first onto the DIN rail. Then, you snap the 1794-OV16 into the base until fully seated.

Communication Options and Network Support

This module supports various communication options for flexibility. For example, it works with ControlNet for high-speed deterministic control. It also supports DeviceNet for device-level networking. Furthermore, EtherNet/IP provides seamless integration with standard Ethernet networks. Finally, Universal Remote I/O supports legacy system connections. Therefore, the 1794-OV16 integrates into almost any Rockwell Automation architecture.

Status Indicators and Diagnostics

The 1794-OV16 features 16 yellow LED status indicators for visual feedback. Each of the 16 channels has a corresponding LED. These LEDs indicate the output signal status for every channel. Consequently, you can quickly identify which outputs are active. This visual confirmation speeds up troubleshooting significantly. Maintenance staff can diagnose issues without any additional tools.

Environmental Specifications and XT Versions

The operating temperature range is 0 to 55 degrees Celsius (32 to 131 degrees Fahrenheit) . The relative humidity range is 5 to 95% noncondensing for reliable operation. Therefore, the 1794-OV16 works dependably in most industrial environments. Additionally, XT versions of standard modules are available for purchase. These XT versions operate in extreme environments with wider temperature ranges. Consequently, they reduce panel and maintenance costs for harsh applications.

Installation Guidelines for the 1794-OV16

First, select a compatible terminal base like the 1794-TB3 or 1794-TB3S. Mount the terminal base securely on a standard DIN rail. Then, snap the 1794-OV16 into the terminal base until fully seated. Always verify that external power is within the 10 to 31.2 Volts DC range. Use proper wire gauges for the 500mA per channel current draw. Additionally, ensure the total module current does not exceed 8.0A for all channels combined. The module has an IP20 rating for indoor panel installation. Finally, check the yellow LED indicators after power-up. These LEDs confirm correct output operation for each of the 16 channels.

Package Contents

• One Allen-Bradley 1794-OV16 Flex I/O Digital Sinking Output Module

• One user manual with installation instructions

• One label sheet for channel identification

• Four dust covers for unused terminal base slots

Frequently Asked Questions (FAQ)

Q1: What is the difference between sinking and sourcing outputs on the 1794-OV16?
A: The 1794-OV16 provides sinking outputs. This means the output switches the load to DC common. Sinking outputs work with sourcing field devices for proper current flow.

Q2: Can I remove the 1794-OV16 while power is applied?
A: Yes, the 1794-OV16 supports removal under power. The module has no direct wiring to the terminal base. Consequently, you can replace it without any system shutdown.

Q3: What terminal base units work with the 1794-OV16?
A: The 1794-OV16 works with 1794-TB3 and 1794-TB3S bases. The TB3 uses screw terminals for secure connections. The TB3S uses spring-clamp terminals for faster wiring.

Q4: What is the maximum output current per channel on the 1794-OV16?
A: Each channel supports a maximum of 500mA on-state current. The total module current must not exceed 8.0A. Therefore, distribute loads carefully across all 16 channels.

Q5: Does the 1794-OV16 have LED indicators for each output?
A: Yes, the 1794-OV16 features 16 yellow LED status indicators. Each of the 16 channels has a dedicated LED. These LEDs show the on or off status of every output clearly.