Product Details
Technical Overview
The 1794-OB8 (Part Number 1794-OB8) is a high-density discrete output component engineered for the Allen Bradley Flex I/O platform. This module provides eight independent sourcing outputs, serving as a critical interface for distributed control systems where modularity and reduced cabinet footprint are required. It facilitates direct communication with the Flexbus to drive various field-side loads such as actuators, indicators, and solenoids.
Designed for industrial resilience, the 1794-OB8 (1794-OB8) utilizes a sourcing configuration, meaning it supplies voltage from the DC common bus to the connected load when activated. The architecture includes opto-isolation to shield internal logic from field-side electrical interference and potential transients.
Detailed Specifications
-
Module Type Digital DC Sourcing Output
-
Output Quantity 8 Non-isolated Channels
-
Operating Voltage Range 10V DC to 31.2V DC (24V DC Nominal)
-
Output Current Rating 4.0A maximum per module (0.5A per channel)
-
On-state Voltage Drop 0.5V DC maximum
-
Off-state Leakage Current 0.5mA maximum
-
Flexbus Current Consumption 60mA at 5V DC
-
Maximum Power Dissipation 3.3W at 31.2V DC
-
Thermal Dissipation 11.2 BTU/hr at 31.2V DC
-
Isolation Voltage 50V Continuous (Basic Insulation Type)
-
External Power Supply 24V DC Nominal (10V to 31.2V DC range)
-
Mounting Configuration Horizontal or Vertical orientation on terminal base
Application Scenarios
The 1794-OB8 (Part Number 1794-OB8) is commonly implemented in decentralized automation architectures across several sectors
-
Direct control of 24V DC pneumatic solenoid valves and manifold blocks.
-
Operation of small DC relays and motor starters in remote panels.
-
Activation of status pilot lights and visual alarm indicators.
-
Distributed I/O for material handling systems to minimize long-run wiring.
Technical FAQ
Does this module include the terminal base for wiring?No, the 1794-OB8 (1794-OB8) is the plug-in electronic module only. It must be installed onto a compatible terminal base, such as the 1794-TB2, 1794-TB3, or 1794-TB3S, to facilitate field connections.
What is the functional difference between sourcing and sinking for this unit?As a sourcing module, the 1794-OB8 (Part Number 1794-OB8) sources current to the load. The external field device must be connected to the negative/common side of the power supply to complete the electrical circuit.
Is there integrated short-circuit protection for the outputs?The module is built for industrial durability but does not feature internal electronic short-circuit protection. It is recommended to install external fusing to protect individual channels from overcurrent or wiring faults.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Site Acceptance Testing (SAT) for PLC Control Systems: An Engineering Execution Guide
The Site Acceptance Test (SAT) represents the definitive handover stage in industrial automation projects. While the Factory Acceptance Test confirms cabinet hardware assembly off-site, the SAT validates real-world performance under live site conditions. Consequently, a structured execution strategy prevents equipment damage and guarantees seamless integration into plant operations.
Mastering the Factory Acceptance Test (FAT) for PLC Control Panels: An Expert Guide
The Factory Acceptance Test (FAT) is a vital milestone in industrial automation that ensures custom PLC panels meet exact design specifications before dispatch. This guide outlines the step-by-step FAT procedure and key industry best practices to prevent costly site delays and ensure long-term operational success.
Redundant Automation Systems: Ensuring Continuous Uptime in Critical Control Infrastructure
System reliability directly determines operational profitability across high stakes process industries. Modern industrial automation platforms must eliminate single points of failure to prevent catastrophic shutdowns. Deploying fault tolerant architecture safeguards complex facilities against unexpected hardware glitches, network disruptions, and maintenance outages.