Overview
The Allen-Bradley 1746-OW16 is a 16-point digital relay output module purpose-built for the SLC 500 family of programmable controllers. This 1746-OW16 module delivers solid-state relay outputs rated for 250VAC and 125VDC applications, making it ideal for controlling contactors, solenoids, indicator lamps, and other industrial loads. The removable terminal blocks simplify installation and field maintenance, while its proven reliability supports continuous operation in demanding manufacturing and process control environments.
Key Features
- 16 relay outputs configured as two groups of 8 points per common
- Solid-state relay technology with LED status indicators for each output
- Output voltage range: 5–265VAC, 5–125VDC for flexible load compatibility
- Fast signal switching: 1ms ON delay, 11ms OFF delay (maximum)
- Removable terminal blocks for quick wiring and serviceability
- Approved for Class I, Division 2 hazardous locations (explosive gas environments)
Technical Specifications
- Number of Outputs: 16 points (8 per common, 2 commons)
- Output Type: Relay, Normally Open
- Output Voltage Range: 5–265VAC (47–63 Hz); 5–125VDC
- Minimum Load Current: 10 mA at 5VDC
- Backplane Current: 0.17A @ 5VDC; 0.18A @ 24VDC
- Off-State Leakage: 0 mA (no load)
- Signal Delay (ON): 1 ms maximum
- Signal Delay (OFF): 11 ms maximum (resistive load)
- Operating Temperature: 0–60°C
- Mounting: DIN-rail rack mounted (SLC 500 chassis)
- Weight: 0.64 lbs
- Certifications: CSA, UL; Class I Division 2
Typical Applications
The 1746-OW16 excels in manufacturing automation, HVAC control, assembly line management, material handling systems, and small-to-medium process control. Engineers deploy this module to:
- Switch motor contactors and pump solenoids on/off
- Control indicator lights and alarm signals
- Drive valve actuators and pneumatic equipment
- Manage discrete loads in hazardous (Class I, Div 2) environments
- Provide distributed I/O when paired with communication modules
Compatibility & Replacements
Compatible With
- Allen-Bradley SLC 500 modular chassis (1746-A2, 1746-A4, 1746-A10)
- All SLC 500 processors (SLC 5/01, 5/02, 5/03, 5/04, 5/05)
- RSLogix 500 programming software
- DeviceNet and ControlNet communication networks
- 1747-AENTR EtherNet/IP adapter for distributed I/O
Replaces / Drop-In Replacement For
- 1746-OW16/B (earlier revision)
- 1746-OW16/C (alternate revision)
- 1746OW16D (OEM variant)
Works With
- RSLogix 500 development environment
- SLC 500 distributed I/O networks (DeviceNet, ControlNet)
- EtherNet/IP via optional communication interface
- Standard 24VDC and 120/240VAC control power supplies
- Surge suppression accessories for inductive loads (1N4004 diodes recommended)
