​1.Product Overview​

The ​Allen-Bradley 1756-OB16D ControlLogix® Digital Output Module​ delivers 16-channel industrial-grade control for mission-critical automation systems. Designed for Rockwell Automation's ControlLogix platform, this Class 1 Division 2 (HazLoc) certified module provides ​24V DC sourcing outputs​ with robust isolation (1500V AC backplane-to-field) and 0.5A continuous current per channel. Its solid-state MOSFET switching technology enables ≤100µs response times while supporting direct connection to solenoids, relays, and indicators without external drivers. Housed in a ruggedized chassis (-40°C to +70°C operational range), it features ​point-per-circuit diagnostics​ and UL 61010-1/NEMA 4X compliance. Embedded electronic keying prevents configuration mismatches in redundant systems using Studio 5000®.

​2.Critical Technical Specifications​

​Key performance parameters:

• ​Output Channels: 16× 24V DC sourcing (per-channel electronic protection)
• ​Switching Capacity: 0.5A continuous/channel, 3A inrush (100ms)
• ​Voltage Range: 20–30V DC (±10% line tolerance)
• ​Leakage Current: <1mA OFF-state (EN 61131-2)
• ​Isolation: 1500V AC field-backplane, 250V AC channel-group
• ​Response Time: ≤100µs ON/OFF (resistive loads)
• ​Surge Protection: Integrated 58V clamping diodes per channel
• ​Power Consumption: 200mA @ 5.1V DC backplane, 900mA max field power
• ​Certifications: UL Class 1 Div 2, ATEX II 3G, IECEx, SIL 2 (IEC 61508)

3.​Targeted Applications​

​Safety-critical output control:

• ​Oil & Gas: Emergency shutdown valve actuation in API 14F Zone 2 locations
• ​Automotive: Robotic weld gun controls with Category 3 PLd safety integration
• ​Pharmaceuticals: Aseptic filling line solenoid control (21 CFR Part 11 compliant)
• ​Water Treatment: Chemical dosing pump activation with SIL 2 interlocks
• ​Power Generation: Turbine lube oil system monitoring relays
• ​Material Handling: Conveyor brake releases in washdown environments (IP67)
  Ideal for high-cycling applications requiring >500k operations without derating.

4.​Competitive Advantages​

​Operational superiorities:

• ​Diagnostic Depth: Per-channel short-circuit/open-load detection (±5ms accuracy)
• ​Safety Architecture: Dual-watchdog timers enable <35ms fault reaction
• ​Space Optimization: Highest channel density (16 pts/75mm) among HazLoc modules
• ​Energy Efficiency: Backplane-powered design eliminates external power supplies
• ​Maintenance Reduction: Hot-swappable 1756-TBNH terminals enable <2min replacements
• ​Lifecycle Resilience: 100k+ cycle rating on MOSFET outputs (10× relay lifespan)
• ​Overload Tolerance: Sustains 300% surge currents without fuse replacement

5.​Functional Capabilities​

​Advanced control features:

• ​Pulsed Output: Configurable pulse-width modulation (0.1–1000Hz) for proportional valves
• ​Staggered Turn-On: In-rush current limiting for multi-solenoid startups
• ​Fault Masking: Programmable channel-level diagnostics ignore transient errors
• ​Safety Override: Force/Lock functions for maintenance bypasses
• ​Load Monitoring: Real-time current measurement (±10mA resolution) per point
• ​Backup State: Configurable fallback positions (ON/OFF/HOLD) on communication loss
• ​Sequence-of-Events: 1ms timestamped output state changes for forensic analysis

​

Packaging & Shipping

Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.
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