Allen Bradley 1738-APB Communication Module

Engineering Insight

When it comes to distributed control in harsh environments, the Allen Bradley 1738-APB Communication Module delivers a combination of precision, toughness, and field-ready design. Acting as a PROFIBUS DP adapter for ArmorPoint I/O, this module integrates industrial performance with a simplified mounting approach — ideal for engineers seeking a resilient and reliable fieldbus node solution in demanding applications.

Technical Data Sheet

Real-World Applications

Engineers rely on the 1738-APB for distributed I/O control in machine environments where PROFIBUS remains a core communication backbone. Common applications include:

• Multi-axis packaging and labeling machines requiring modular expansion.

• Conveyor automation where I/O distribution reduces wiring distance.

• Process skids in pharmaceutical and food-grade plants using PROFIBUS DP control.

• Retrofit projects integrating existing PROFIBUS infrastructure with ArmorPoint I/O.

• Automotive or bottling systems with decentralized machine-level control points.

Technical Edge & Performance Advantages

• Integrated PROFIBUS Connectivity: Enables seamless integration with legacy PROFIBUS controllers.

• High Node Capacity: Supports up to 63 modules, ideal for modular, scalable systems.

• On-Machine Mounting: Reduces cabinet space and simplifies wiring complexity.

• LED Diagnostics: Real-time status indication minimizes troubleshooting effort.

• Wide Power Range: Flexible operation from 10 to 28.8 VDC ensures compatibility.

• Durable Build: Withstands industrial vibration, temperature, and electrical noise.

• Rapid Setup: Auto-baud detection and simple addressing reduce commissioning time.

• Scalable Design: Easily expanded by adding ArmorPoint I/O modules.

• Efficient Power Distribution: Integrated backplane current reduces need for external supplies.

• Reduced Downtime: Field diagnostics and modular replaceability enhance uptime.

Engineering FAQs

1. Q: Does the 1738-APB automatically detect PROFIBUS baud rate?
   A: Yes, it supports full auto-baud detection across all standard PROFIBUS DP speeds.

2. Q: How many ArmorPoint modules can be attached per node?
   A: Up to 63 modules, depending on current consumption and power distribution.

3. Q: Can I use this module in outdoor or washdown environments?
   A: It’s suitable for protected environments or inside enclosures; higher IP-rated ArmorPoint versions are available for washdown.

4. Q: What is the current capacity of the internal backplane?
   A: It provides up to 1 A @ 5 VDC to supply attached ArmorPoint I/O modules.

5. Q: Does it support redundant PROFIBUS connections?
   A: No, redundancy is not natively supported; it is a single-network device.

6. Q: What are the recommended cable types for PROFIBUS connections?
   A: Use shielded twisted-pair cables compliant with EN 50170 for optimal signal integrity.

7. Q: Is it possible to hot-swap modules on the POINTBus?
   A: Controlled replacement is possible with proper power isolation and configuration management.

8. Q: Can diagnostic data be read remotely?
   A: Yes, diagnostic and fault information are available to the PROFIBUS master.

9. Q: How do I verify network integrity?
   A: Use LED indicators and PROFIBUS diagnostic tools to monitor communication and module health.

10. Q: What’s the recommended grounding practice?
    A: Ensure single-point grounding and shield continuity for minimal noise interference.

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