Product Overview
The Allen-Bradley 1756-OBV8S is a ControlLogix digital DC I/O module engineered for safety-critical output applications. It provides eight points for connecting outputs, each rated for a maximum current of 0.5 A. Operating within a voltage range of 10 to 30 VDC, this I/O module integrates seamlessly into a ControlLogix system, offering reliable performance for demanding industrial environments.
Technical Specifications
| Specification |
Value |
| Manufacturer |
Allen-Bradley / Rockwell Automation |
| Series |
ControlLogix |
| Part Number |
1756-OBV8S |
| Product Type |
I/O Module |
| Voltage Rating |
10-30 VDC |
| Input/Output Type |
Digital DC |
| Number of Points |
8 Points |
| Current Rating |
Max current per output: 0.5 A |
| Output Type |
Safety Outputs |
| Connector |
20 Pin |
| Protection |
Short-circuit and overcurrent protection |
| Response Time |
Fast response for safety-critical outputs |
| Temperature Range |
Operating: 0°C to 60°C |
| Weight |
0.29 kg |
Key Features
-
Safety Outputs: Designed to meet fast response requirements for safety-critical output tasks.
-
Robust Protection: Built-in short-circuit and overcurrent protection enhances system reliability.
-
Compact Design: Lightweight at 0.29 kg, simplifying mounting and wiring in ControlLogix enclosures.
-
Wide Operating Temperature: Functions reliably from 0°C to 60°C, suitable for diverse industrial settings.
Industry Applications
The Allen-Bradley 1756-OBV8S is ideal for applications requiring dependable safety outputs, such as emergency stop circuits, machine guarding, and process interlocking. Its 10-30 VDC range and 0.5 A per point capacity make it suitable for controlling solenoid valves, indicator lamps, and small relays in automated production lines. In a typical packaging line, the 1756-OBV8S ensures rapid de-energization of actuators during safety events, reducing downtime and protecting personnel.
Installation & Setup Guidance
Mount the 1756-OBV8S in a ControlLogix chassis following standard I/O module installation procedures. Ensure the chassis is powered off before insertion. Connect field wiring to the 20-pin connector, observing correct polarity and torque specifications. Verify that the supply voltage is within the 10-30 VDC range. After installation, configure the module in the ControlLogix programming software, assigning each output point as required. Always follow the manufacturer's guidelines for safe installation.
Maintenance & Reliability
Routine inspection of the 1756-OBV8S is minimal. Periodically check for loose connections, signs of overheating, or contamination on the connector. Keep the module within its specified temperature range to maximize service life. The built-in short-circuit and overcurrent protection help prevent damage, but regular system diagnostics are recommended to ensure continued reliability.
Compatibility & Integration
The 1756-OBV8S is specifically engineered for the ControlLogix platform, ensuring seamless integration with ControlLogix controllers and other I/O modules. It communicates over the ControlLogix backplane, requiring no additional communication modules. The module is compatible with standard 20-pin wiring and is designed for use in both new and existing ControlLogix systems.
Selection Guide & Purchasing Advice
Before purchasing, verify that your ControlLogix chassis has an available slot and that the power supply can handle the module's current draw. Confirm that the 20-pin connector matches your existing wiring scheme. For reliable sourcing, consider PLC Source PRO, a trusted supplier of industrial automation spares. Ensure the part number matches exactly: 1756-OBV8S.