General information
Notes and explanations General introduction Basic system structure The minimum configuration of an AS-i system consists of the master, an AS-i power supply and the slaves. If needed, the user can also connect safe- ty monitors, repeaters, earth fault monitors or other diagnostic tools to the AS-i network.
Basic structure ofan AS-i system. fieldbus system AS-i flat cable sensors AS-i modules AS-i power supplyand controller e The most important additions of the version 3.0: controllere . The slaves must also supportthese functions. More details are given on the product pages. The most important new features of the version 2.1: asynchronous, serial protocol A/B slaves with 4 inputs and 4 outputs several slaves in one unit parameter setting possibleA master compatible with AS-i 2.1 and / or AS-i 3.0 is required to utilize thenew features. At ifm this is the Qualified diagnostic options, peripheral fault bit “plug& play” for analogue participants Increase of the number of participants from 31 to 62 Extended ID code in the slave. AS-interface version 2.1 In 1999 the AS-International Association improved its tried and tested indus-trial standard AS-Interface by some important features. This is called ver- sion 2.1. As the designation suggests, these features are downward compat- ible. For the user this means the investments he made are protected since all existing AS-i slaves can be further used under version 2.1. So the physical bus structure and the protocol have remained unchanged since 1992. At the end of 2004 a downward compatible extension, AS-i 3.0, was agreed. This new version describes a new slave generation with serial data transmission and other special applications. The AS-i specification 3.0 comprises all for- mer specifications (2.0 and 2.1). Visit our website: www.ifm-electronic.com

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