Overview
The Allen-Bradley 1746-OB16 Series D is a discrete DC output module for SLC500 that delivers sixteen 24VDC output channels with an operating voltage range of 10-50V DC. This module provides voltage isolation between the backplane and outputs tested at 1500 Volts AC, with a total heat dissipation of 7.6 Watts. The module features electronic protection against current overload and short circuit conditions, making it a robust choice for expanding PLC I/O capacity.
Key Features
- 16 DC output channels in a single group with 24V DC signal voltage
- Electronic protection against current overload and short circuit conditions based on thermal cut-out principle
- Surge suppressors on series B and later modules for fast off-delay with inductive loads
- Removable terminal block for accessible connections and maintenance
- CSA and UL-certified with Class I, Division 2 Hazardous Environments rating
- LED indicators for output status monitoring and troubleshooting
Technical Specifications
- Output Type: Digital DC sourcing, 24V nominal
- Output Voltage Range: 10-50V DC
- Number of Outputs: 16 channels
- Backplane Current: 0.28 Amps at 5V DC; 0 Amps at 24V DC
- ON-State Voltage Drop: 1.2V at 0.50 Amps maximum
- OFF-State Leakage Current: 1 milliamp maximum
- Signal Delay (Maximum): 0.1ms ON-state; 1ms OFF-state
- Surge Current: 3 Amps per point for 10 milliseconds, recurring every 1 second at 30°C and every 2 seconds at 60°C
- Operating Temperature: 0 to 60°C (32–140°F) at 5 to 95% non-condensing humidity
- Isolation Voltage: 1500V AC tested between backplane and outputs
- Heat Dissipation: 7.6 Watts total per module
- Continuous Current per Module: 8.0A at 30°C; 4.0A at 60°C
- Minimum Load Current: 1 milliamp
- Mounting: Single-slot installation in 1746 I/O chassis
- Certifications: CSA and UL-certified; Class I, Division 2 Hazardous Environments
Typical Applications
- Industrial machinery control and sequencing
- Solenoid and contactor switching
- Motor starter and pump control
- LED and indicator light control
- Process automation and material handling systems
- Manufacturing and assembly line control
Compatibility & Replacements
Compatible With
- SLC 500 product family (SLC 5/01, 5/02, 5/03, 5/04, 5/05)
- Allen-Bradley 1746 I/O chassis (CompactLogix, MicroLogix compatible chassis)
- Any free I/O slot in a 1746-A2, A4, A13 or compatible backplane (except leftmost slot reserved for processor)
Replaces / Drop-In Replacement For
- 1746-OB16C (Series C)
- 1746-OB16B (Series B)
- 1746-OB16A (Series A)
- 1746-OB16 (earlier revisions without surge suppression)
Works With
- RSLogix 500 / Studio 5000 programming software
- Connected Components Workbench (CCW)
- DeviceNet, ControlNet, and EtherNet/IP communication interfaces (when used with compatible gateway modules)
