1746-OVP16 Allen-Bradley SLC 500 Output Module

Product Overview

The Allen-Bradley 1746-OVP16 is a high-current 16-channel digital DC sinking output module engineered for the SLC 500 programmable logic controller system. Operating across a 20.4 to 26.4 Vdc range, this module switches heavy industrial loads with a continuous rating of up to 1.5 A per output point (6.4 A total per module). The 1746-OVP16 provides reliable control for solenoids, actuators, relays, and indicators in automated process environments.

Designed for easy field wiring and maintenance, the module features color-coded Removable Terminal Blocks (RTBs), integrated circuit protection via a fused common, and an active blown-fuse LED status indicator. Backplane current consumption is minimal at 250 mA at 5 Vdc and 0 mA at 24 Vdc, optimizing rack power distribution across crowded SLC chassis layouts.

Key Features and Benefits

• 16 High-Current Sinking Outputs: Drives up to 1.5 A continuous load per channel for demanding DC field devices.
• Integrated Fuse Protection: Fused common circuit guards backplane circuitry against field-side short circuits.
• Removable Terminal Block (RTB): Simplifies module replacement without disconnecting individual field wires.
• Rapid Signal Switching: Ultra-fast response times (0.1 ms ON, 1.0 ms OFF signal delay) enable precise output timing.
• Diagnostic LED Array: Front-panel indicators display individual I/O point status, processor health, and fuse fault conditions.
• Industrial Immunity: Tested to withstand 30g operational shock and radiated RF noise up to 10 V/m.

Technical Specifications

Detailed electrical, mechanical, and operational parameters for the Allen-Bradley 1746-OVP16 are structured below:

Target Equipment and Application Scenarios

• Heavy-duty 24 Vdc industrial solenoid valves requiring current loads up to 1.5 A per point.
• DC motor starters, contactors, and high-power indicator lamp banks across automated assembly lines.
• Packaging, material handling, and stamping equipment utilizing current-sinking DC field logic.
• Retrofit maintenance for legacy SLC 500 racks in automotive, food & beverage, and chemical processing facilities.

Diagnostic Capabilities and Diagnostics

The Allen-Bradley 1746-OVP16 features built-in hardware diagnostics to accelerate troubleshooting on the shop floor. An integrated blown-fuse LED instantly alerts technicians when a field short or overcurrent event trips the common fuse. Additionally, front-panel LEDs display individual I/O point states and processor communications, automatically de-energizing all output points if a CPU error occurs to prevent unsafe machine operation.

Global PLC Spare HUB's Insight & Field Experience

When selecting the 1746-OVP16, verify whether your field sensors and actuators require current sinking (OVP) or current sourcing (OBP) logic. Sinking outputs connect the field load to ground (0 Vdc), which differs from standard sourcing modules that supply +24 Vdc directly to the load.

Always perform load thermal derating when operating in high-temperature enclosures. While each output handles 1.5 A, the entire module is capped at 6.4 A continuous total. If you drive multiple high-current solenoids simultaneously, distribute high-amperage loads across separate output channels or adjacent modules to avoid exceeding thermal limits.

Compliance, Shipping, and Warranty Terms

• Package Contents: 1 x New factory-sealed Allen-Bradley 1746-OVP16 digital output module with removable terminal block.
• Warranty Coverage: Backed by a full 12-month factory replacement warranty starting from the purchase invoice date.
• Express Global Courier: Fast dispatch within 24-48 hours via leading global carriers including FedEx, UPS, and DHL.

Frequently Asked Questions (FAQ)

Question: What is the operational difference between sinking and sourcing output modules in the SLC 500 series?

Answer: Sinking modules pull load current to ground (0 Vdc return), whereas sourcing modules supply positive DC voltage (+24 Vdc) directly to the external field device.

Question: How can maintenance personnel quickly identify a blown fuse condition on this hardware?

Answer: The module features a dedicated blown-fuse LED on the front display panel that illuminates immediately when an overcurrent trip interrupts the common fuse line.

Question: Can I wire high-inrush inductive loads directly to this DC output unit?

Answer: Yes, each point supports up to 4 A peak surge current for 10 ms, but installing external flyback suppression diodes across heavy inductive coils is recommended to maximize relay life.

Question: Is it necessary to power down the entire PLC chassis when replacing field wiring on this unit?

Answer: No, the color-coded Removable Terminal Block allows field wiring replacement without unscrewing individual terminals, though disconnecting field power during wiring is best safety practice.

Question: What occurs to the field outputs if the CPU processor encounters a fatal fault?

Answer: The hardware safety logic automatically drops backplane communication, extinguishes the active status lights, and forces all 16 output points into an OFF state.

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