AS Interface Overview

Introduction to AS Interface

• AS Interface (ASI): Actuator Sensor Interface
• Networking system for field devices
• Intelligent cabling system replacing discrete wires

Key Features of AS Interface

• Simple cable system:
  • Easy to wire and operate
  • Designed for master-slave device exchanges
• Master-Slave Communication:
  • 1 AS Interface Master can exchange data with up to 62 slave devices
  • Each slave can handle 4 inputs and 4 outputs (analog/digital)
• Cost-Effective:
  • Simplicity in wiring and location makes ASI an attractive alternative to traditional devices
  • Fast response time: typically quicker than PLC data acquisition cycles

Communication and Timing

• Data transmission is predefined in CICLIC
• Timing for outputs can be calculated accurately, useful for timing-critical applications

Components of AS Interface System

1. AS Interface Master:
   • Connects to higher control systems
   • Manages data traffic, parameter setting, diagnostics, and monitoring
2. AS Interface Cables:
   • 2 cables required:
     • Yellow cable: carries power and data to sensors
     • Black cable: carries 24V power to actuators
   • Special piercing technology allows nodes to connect anywhere on the cable
3. Power Supply Unit:
   • Provides regulated 30V DC for master and slaves
   • Functions as a data decoupler for simultaneous power and data transfer

Connectivity and Range

• Can connect directly to a PLC via AS Interface master
• Can be part of a larger system using fieldbus connections (e.g., PROFINET, PROFIBUS)
• Typical range: 100 meters; extendable to 600 meters with repeaters

ASI Safe and ASI Power 24V

• ASI Safe: TUV certified, used in safety systems
  • Directly connects emergency stop buttons, safety door contacts
• ASI Power 24V:
  • Utilizes standard 24V power supplies
  • Suitable for smaller systems; reduces distance to 50 meters

Summary

• AS Interface: a simple communications protocol
• Master can manage up to 62 slave devices
• Transmits digital/analog signals, up to 4 inputs and 4 outputs
• Integrated power and data transmission with reduced cabling needs
• Low-cost, viable alternative to traditional complex wiring
• Configuration is simple: only require the ID recognition by the AS Interface Master

Conclusion

• AS Interface is a versatile and straightforward solution for actuator and sensor networking
• For more learning: visit realpars.com for PLC programming resources.