AS-Interface represents an open and manufacturer-independent bus system. Actuators and sensors are connected to the control via an unshielded 2-wire line – with simultaneous transmission of data and energy.
The master, a power supply unit as well as various standard and safe stations (slaves) form the basis of every AS-i system. The master ensures data exchange with the slaves by means of cyclic polling. The AS-i power supply units supply the network's slaves and sensors with energy.
AS-Interface networks can be very comfortably directly connected to the SIMATIC control. For this purpose, so-called CPs or CMs are available. Integration is just as easy as with other expansion modules of SIMATIC controls by Siemens. Besides direct integration, AS-Interface can also be employed in a distributed manner via AS-i links as feeder for superior bus systems.
Number of slaves
Up to 62
Number of I/Os
Up to 496 inputs and 496 outputs
Any, combinable, no termination resistors
Unshielded two-wire line for data and energy
100 m as a standard, extendable to 600 m with Repeater and Extension Plug
5 ms (typical)
Digital and analog (16 bit)
As the largest system supplier in the field of AS-Interface, Siemens offers a comprehensive product range of AS-i slaves. The portfolio ranges from simple and safe I/O modules for the field and the control cabinet to pushbuttons and signaling columns as well as position switches with AS-i connection right down to powerful motor starters and frequency converters, software tools (TIA Portal) and services.
Siemens = full-range AS-i portfolio
Full-range AS-i product portfolio for bus-based standard and safety technology from a single source
Consistent integration of AS-i devices by Siemens in the SIMATIC programming and diagnostics concepts and in the TIA Portal engineering framework
Integration of ASIsafe applications in SIMATIC safety programming (e.g. Distributed Safety)
Planning, calculation and verification of the entire safety chain on the basis of ASIsafe in the Safety Evaluation Tool (TÜV-tested)
Integration of subordinate AS-i networks in the PCS 7 process control system
Global spare parts logistics, consulting and service