Allen-Bradley 1746-OV8 SLC 500 Discrete Output Module 8-Channel

Product Overview

The Allen-Bradley 1746-OV8 is a discrete output module from the SLC 500 series by Rockwell Automation. It provides eight (8) 24 Volt DC sinking output channels in a single group. Designed for high-current applications, this module delivers reliable on/off control for solenoids, contactors, and indicator lights in industrial environments. Its compact single-slot design installs directly into any SLC 500 chassis, making it a versatile choice for both new installations and legacy system expansions.

Technical Specifications Breakdown

Key parameters for the 1746-OV8 are listed below for quick reference:

Industry Applications

For example, in a packaging line, the eight sinking outputs can directly control pneumatic valves for actuator sequencing. The high per-point current (1.0 A at 30°C) supports multiple small loads without external relays, reducing panel space and wiring complexity. In a conveyor system, the module's fast 0.1 ms ON signal delay ensures precise timing for sortation gates. The wide 10-50 VDC range accommodates varying supply voltages common in global facilities.

Installation & Setup Guidance

Mount the 1746-OV8 into any single slot of an SLC 500 chassis. Ensure the backplane connector is fully seated before tightening the module screws. Use the self-lifting pressure plate terminals, which accept up to two 14 AWG (2 mm²) wires each. For sinking outputs, connect the load between the output terminal and the DC common (V-). The common terminals are grouped per point common configuration. Always verify that the external power supply voltage stays within 10-50 VDC. For distributed I/O stations, install the module in an extension rack or local chassis as needed.

Maintenance & Reliability

Inspect the module periodically for dust accumulation and ensure the operating temperature stays within 0 to +60 °C. The module's LED indicators on the front panel provide immediate visual status of each output channel. In high-vibration environments, verify that the terminal block screws remain tight. The module is rated for 30g operating shock, making it suitable for heavy industrial machinery. Relative humidity should be kept between 5% and 95% non-condensing to prevent corrosion.

Compatibility & Integration

It is supported in local, extension, and distributed I/O racks. The number of modules per system is limited only by the processor's I/O capacity and available slots. Use pre-wired cables or a 1492 interface module for simplified wiring. The module's color-coded removable terminal blocks aid in quick identification during installation or replacement.

Selection Guide & Purchasing Advice

When selecting the 1746-OV8, confirm your application requires eight sinking DC outputs with a voltage range of 10-50 VDC. For higher current needs, consider modules with higher per-point ratings. AutoDCSTech stocks this module and can advise on lifecycle status. Please verify current lifecycle status and availability with AutoDCSTech before ordering. Our team can also recommend compatible SLC 500 chassis and accessories.

Troubleshooting & Common Issues

If an output channel fails to energize, check the corresponding LED indicator. If the LED is off, verify the output point's wiring and the external DC supply. If the LED is on but the load does not activate, measure the output voltage at the terminal; a voltage drop above 1.2 V at 1 A indicates a possible overload or short circuit. For intermittent operation, inspect for loose terminal connections or excessive ambient temperature exceeding 60°C. The module's maximum off-state leakage is 1 mA, which may cause faint activation in sensitive loads; add a bleeder resistor if needed.