Overview
The Allen-Bradley 1756-OB16E is a ControlLogix 16-point digital output module engineered for 24 VDC control applications in industrial automation systems. This sealed, electronically fused module delivers 16 sourcing outputs divided into two groups of 8 channels, each with independent electronic fuse protection. Operating across a 10–31.2 VDC range (nominal 24 VDC), the 1756-OB16E is the standard DC output module for ControlLogix chassis including the 1756-A4, A10, A13, and A17 series.
Key Features
- 16 electronically fused DC output channels — two groups of 8 with independent fuse protection for enhanced reliability
- 1 A per point maximum at 60°C; 8 A module-wide rating for controlled power distribution
- 10–31.2 VDC operating range — compatible with standard 24 VDC field supplies and flexible for lower-voltage circuits
- Fast response time — 70 µs typical ON delay, 360 µs typical OFF delay for precise output switching
- Compact DIN-rail or chassis mounting — integrates seamlessly into 1756 ControlLogix backplane
- Status indicators for output fuse condition, communication link, and module health monitoring
Technical Specifications
- Outputs: 16 points, electronically fused (8 per group)
- Voltage Category: 12/24 V DC source
- Operating Voltage Range: 10–31.2 V DC
- Max Output Current per Point: 1 A at 60°C (140°F)
- Module-Wide Current Rating: 8 A at 60°C
- Surge Current: 2 A for 10 ms per point
- Output Delay (OFF to ON): 70 µs nominal / 1 ms max
- Output Delay (ON to OFF): 360 µs nominal / 1 ms max
- Off-State Leakage Current: 1 mA per point maximum
- On-State Voltage Drop: 400 mV DC @ 1 A
- Backplane Current Draw @ 5.1 V: 250 mA
- Backplane Current Draw @ 24 V: 2 mA
- Power Dissipation: 4.1 W @ 60°C
- Thermal Dissipation: 13.98 BTU/hr
- Terminal Block: 1756-TBCH or 1756-TBSH (32-point, spring-clamp)
- Operating Temperature: 0–60°C
- Certifications: CE, ATEX, IECEx, Australia RCM, China CCC
Typical Applications
The 1756-OB16E is widely deployed in manufacturing environments for controlling:
- Solenoid valves in pneumatic/hydraulic systems
- Motor starters and contactor coils for machine control
- Indicator pilot lights and alarm signals
- Discrete load switching in packaging, assembly, and process automation
- Safety circuit outputs in GuardLogix and standard ControlLogix safety applications
Compatibility & Replacements
Compatible With
- 1756-A4, 1756-A10, 1756-A13, 1756-A17 ControlLogix chassis
- 1756-L63, 1756-L72, 1756-L73 ControlLogix processors
- Studio 5000 Logix Designer (all supported versions)
- EtherNet/IP communication
- Rockwell Automation ControlLogix backplane standard
Replaces / Drop-In Replacement For
- 1756-OB16 (earlier non-sealed output module — verify compatibility with system integrator)
- Other 16-point DC output modules in legacy systems (verify with controls documentation)
Works With
- Studio 5000 Logix Designer (AOP – Add On Profiles for 1756 Discrete I/O v40.12.22 and later)
- EDS files available via Rockwell Automation Literature Library
- Third-party OPC servers and industrial protocol gateways
- 1756-TBCH and 1756-TBSH terminal blocks (spring-clamp, 32-point)
