Brief Product Description

Allen-Bradley 1746-OV16 is a 16-channel sinking DC digital output module designed for Rockwell SLC 500 PLC systems. It receives control commands from the SLC 500 CPU and switches 24VDC output signals to drive field loads such as solenoid valves, contactors, indicator lights and solid-state relays. The module provides overcurrent protection per channel and optical isolation between backplane and field circuits to prevent noise and surge damage to the PLC rack. It plugs directly into the 1746 chassis backplane and communicates with the processor over the SLC I/O bus. Built with industrial solid-state switching hardware, it offers reliable on/off control for factory automation. Fully tested surplus and refurbished Allen-Bradley 1746-OV16 modules are available for legacy SLC500 system maintenance, I/O module replacement and plant automation retrofit projects.

Core Product Functions

• 16-channel sinking 24VDC digital output for discrete on/off control of field devices
• Convert PLC internal logic commands into switching signals to actuate solenoids, relays and lamps
• Optical isolation between SLC backplane and field wiring to suppress common-mode noise
• Individual channel overcurrent protection to limit damage caused by short-circuit loads
• Real-time status LED indicators for each output channel for quick on-site troubleshooting
• Compatible with 1746 SLC 500 chassis and backplane for simple rack installation
• Short-circuit detection to identify faulty field wiring and protect module hardware
• High-speed solid-state switching suitable for repetitive digital control tasks
• Supports SLC 500 CPU I/O scanning for seamless integration with ladder logic programs

Application Scenarios

• Rockwell SLC 500 PLC rack discrete digital output control
• Factory assembly lines, conveyor systems and packaging machine automation
• Water and wastewater treatment plant valve and pump discrete control
• Material handling, sorting equipment and automated machine safety interlocks
• General manufacturing on/off control for indicators, contactors and solenoid valves
• Legacy SLC500 digital output module replacement, maintenance and plant retrofits

FAQ (Frequently Asked Questions)

• Q: Output channel fails to activate or channel LED does not light after installing 1746-OV16?
  A: Check 24VDC field power supply, verify sinking/sourcing wiring configuration, inspect for short circuit on load side, check backplane connection and PLC program output mapping.
• Q: Does Allen-Bradley 1746-OV16 support hot-swap replacement?
  A: Hot swap is not recommended. Back up PLC program, power down the SLC chassis and perform lockout-tagout before replacement to avoid unexpected field device actuation.
• Q: What signal type is 1746-OV16?
  A: It is a 16-channel sinking 24VDC digital output module for SLC 500 PLC.
• Q: What loads can this module drive?
  A: It drives 24VDC field loads including solenoid valves, indicator lamps, solid-state relays and contactor coils.
• Q: Is Allen-Bradley 1746-OV16 available for new automation projects?
  A: This legacy SLC500 digital output module is end-of-life for new installations. Only fully tested surplus and refurbished units are supplied for existing SLC500 system maintenance and retrofits.