1794-ASB2 | Allen-Bradley Flex I/O Remote Adapter - Petro Auto Tech

Product Overview

The 1794-ASB2 is a remote I/O adapter from the Allen-Bradley Flex I/O 1794 product line. This unit supports up to 2 FLEX I/O modules, making it a compact and cost-effective solution for distributed control architectures. It operates on a 24V DC power supply and provides reliable communication with programmable logic controllers.

Technical Specifications Analysis

The 1794-ASB2 adapter features a nominal voltage of 24V DC and an input voltage range of 11-31.2V DC. It delivers an isolation voltage of 500V AC and draws a power consumption of 330mA. The unit weighs 0.44 lbs (0.20 kg) and has an I/O capacity of 2 modules. Communication rates include 57.6 Kbps, 115.2 Kbps, and 230.4 Kbps. The adapter also provides a maximum FlexBus output current of 640 mA at 5V DC.

Application Scenarios & Usage Methods

This adapter is ideal for remote I/O applications in manufacturing plants, process control systems, and material handling facilities. Use it to connect sensors and actuators located far from the main controller, reducing wiring costs. For best results, pair the 1794-ASB2 with compatible Flex I/O modules and a 24V DC power supply that can handle a 23 A inrush surge for 2 ms.

Installation Guide & Packing List

Mount the 1794-ASB2 on a DIN rail or panel using the open enclosure design. Ensure the power supply is off before wiring. Connect the remote I/O cable to the adapter and configure communication rates via the switches. The package includes the 1794-ASB2 adapter unit and mounting hardware. No additional accessories are included.

Purchasing Advice

When buying the 1794-ASB2, verify that your system uses a 24V DC supply and requires only 2 I/O modules. Check compatibility with your PLC processor—do not use with classic PLC-5/15 or PLC-5/25 processors. Petro Auto Tech offers genuine Allen-Bradley products with fast shipping and expert support.

Repair & Maintenance Tips

Regularly inspect the adapter for dust buildup and ensure proper ventilation. Check the red/green status indicators for power and connection status. Avoid exposing the unit to moisture or excessive vibration. Store in a clean, dry environment when not in use.

Frequently Asked Questions (FAQs)

Q: What is the input voltage range of the 1794-ASB2?

A: The input voltage range is 11-31.2V DC, including a 5% AC ripple.

Q: How many I/O modules can the 1794-ASB2 support?

A: It supports up to 2 FLEX I/O modules.

Q: What is the weight of the 1794-ASB2 adapter?

A: It weighs 0.44 lbs (0.20 kg).

Q: Can I use the 1794-ASB2 with any PLC processor?

A: No, do not use it with classic PLC-5/15 or PLC-5/25 processors to avoid damage.

Q: What communication rates does the 1794-ASB2 support?

A: It supports 57.6 Kbps, 115.2 Kbps, and 230.4 Kbps.