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Valves & Actuation
79 bus bfly valve

Plastic Actuated Butterfly Valves

Options - AS-i Bus System

Series 79 Pneumatic Actuator and Type-57 Butterfly Valve

Actuator-Sensor Interface (AS-i) offers many of the benefits of more complex and costly bus systems, but does it at a substantially lower cost, and with greater simplicity. The AS-i is ideally suited for controlling valves, actuators and many other field devices in your processing application.

This interface can be used for stand-alone process control, or it can be used together with a higher-level bus control system. AS-interface does not compete with higher-level bus systems; it should be seen as a complimentary system that offers low cost, reliable device control for binary and analog devices. Reliability, simplicity and interoperability make AS-interface a cost effective connection/control solution, particularly where low installation costs are imperative.

A single pair of wires, which handles power and communications, is used to control the network by means of "chaining" the actuators with the PLC. Each actuator (or device) will then have its own unique address within the system, and only that device with the proper address, will respond to system commands.

AS-i is best known for its yellow flat cable, which is pierced by insulation displacement connectors so that the expense of tees and complex connectors is avoided. Devices are simply clamped onto the cable

Ideal Applications Include:

Chemical Processing, Water & Wastewater, Landfills, Irrigation, Food Processing, Mining

Specifications

Mounting:

ISO/NAMUR

Connection:

M12 SS

AS-i Current Draw:

.16 AMP

Electrical Design:

2-input/2-output

Voltage Range:

26.5-31.6 VDC

Sensor Protection:

Type 4X

Air Connection:

1/4" FNPT

Solenoid Coil:

Epoxy encapsulated

Solenoid Protection:

Type 4x

Sensor/Relay Supply:

AS-i
Reverse polarity protected

Features/Benefits

  • Low profile, compact package for ease in mounting where space limitations are an issue.
  • Actuators and accessories meet ISO and NAMUR standards, therefore, no special training is required for field installation/conversion.
  • M12 SS connection utilized for network interfacing - Type 4X rated.
  • No moving parts with proximity sensor triggered by a target puck.
  • Sealed proximity switch so open cavity condensation is not an issue.
  • Each actuator has visual indication and proximity feedback to the PLC.
  • Each component meets Type 4X.
  • Low power consumption allows power and data communications via the same two-wire cable.
  • A system of 31 valves requires less than 5 amps of AS-i power.
  • Expandability with gateway and/or insulation displacement connector.
  • 5 ms reaction time from PLC to cycling of unit.
  • Conformance to AS-i Certificate ZU15101.
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