AS-i Bus Actuation
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Catalog excerpts

AS-i Bus Actuation - 1

AS-i (actuator sensor interface) 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-i 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-i a cost effective connection/control solution, particularly where low installation costs are imperative. A 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. Digital signals are encoded on this cable in a sinusoidal signal, which has a very narrow frequency bandwidth. Filtering, which is distributed through the network, rejects all extraneous frequencies, and, in this way, AS-i can be operated in electrically noisy environments without experiencing transmission errors. The yellow flat cable carries low current (30 VDC) for input devices as well as the AS-i signal. If power for outputs (such as energizing relays) is required, an additional black flat cable is available. Standard networking is capable of 62 units with a distance up to 100 meters, and a cycle time of 5 ms. A maximum of 300 meters is achieved by installing repeaters. This system also responds well with products from other manufacturers, by installing a gateway to “translate” the commands of higher level networks. This allows an existing system to be expanded simply by using the AS-i networking system. There are various wiring structures that can be used with this system such as the star, the ring, the branch, and the tree, etc. All are practiced and acceptable, but the loop has a distinguished property; if there were a “break” in the network cable the units would still cycle and the master would detect the loss of a node. This feature is unique to the ring structure.

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AS-i Bus Actuation - 2

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/Relay Supply: AS-i Sensor Protection: Type 4X Air Connection: 1/4" FNPT Solenoid Coil: Epoxy encapsulated Solenoid Protection: Type 4X Reverse polarity protected AS-i Bus System Standard Features • 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 stainless steel...

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