Overview
The Allen-Bradley 1756-OW16I is a ControlLogix 16-point digital isolated relay output module designed for industrial automation, motion control, and process control systems. Part of Rockwell Automation’s Bulletin 1756 ControlLogix family, this module provides 16 individually isolated normally open (N.O.) relay contacts operating in AC and DC voltage environments. The isolation architecture eliminates common-mode noise and electromagnetic interference, ensuring reliable signal integrity in demanding plant environments.
Key Features
- 16 individually isolated normally open relay contacts for noise-free switching
- Dual voltage support: 10–240V AC and 5–125V DC operating range
- Fast response time: 10 ms maximum switching delay (on-to-off and off-to-on)
- Low power consumption: 150 mA at 5.1V and 24V with 4.4W backplane draw
- Point-level status and fault diagnostics via module health display
- Single-slot ControlLogix chassis mounting for compact integration
Technical Specifications
| Specification | Value |
| Output Points | 16 N.O. individually isolated |
| Operating Voltage (AC) | 10–240V, 50/60 Hz |
| Operating Voltage (DC) | 5–125V |
| Output Current (5–30V DC) | 1 A |
| Output Current (48V DC) | 0.5 A |
| Output Current (125V DC) | 0.22 A |
| Output Current (120V AC) | 1.5 A |
| Output Current (240V AC) | 0.75 A |
| Switching Delay | 10 ms max (off-to-on and on-to-off) |
| Input Current @ 5.1V | 150 mA |
| Input Current @ 24V | 150 mA |
| Backplane Power | 4.4 W |
| Power Dissipation | 4.5 W @ 60°C |
| Off-State Leakage (per point) | 1.5 mA max |
| Minimum Load Current | 10 mA per point |
| Contact Resistance | 100 mΩ @ 6V, 1 A |
| Operating Temperature | 0–60°C |
| Module Mounting | ControlLogix Chassis (1 slot) |
| Certifications | UL Listed, CE, CSA, RCM, KC |
| Series | ControlLogix (Bulletin 1756) |
Typical Applications
- Machine automation and motor control circuits requiring isolated outputs
- Discrete event control with multiple independent switching loads
- Pharmaceutical and food processing systems demanding electrical isolation
- Material handling and conveyor systems with mixed AC/DC control devices
- Remote equipment switching and critical point-level status monitoring
Compatibility & Replacements
The 1756-OW16I integrates seamlessly into all ControlLogix and CompactLogix-compatible platforms that support Bulletin 1756 I/O modules. Compatible with Studio 5000 Logix Designer software for programming and diagnostics. No direct one-for-one replacements exist for this exact configuration; alternative isolated modules in the ControlLogix family include the 1756-OW8I (8-point) and 1756-OW24I (24-point) variants. Used units are widely available through authorized distributors and third-party resellers as drop-in replacements for legacy systems.
