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.
Key data per AS-i network
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
AS-Interface networks can be very comfortably directly connected to the SIMATIC control or Distributed I/0s. For this purpose, so-called CPs or CMs are available. Integration is just as easy as with other expansion modules of SIMATIC by Siemens.
Besides direct integration, AS-Interface can also be employed in a distributed manner as feeder for superior bus systems. With the help of AS-i gateways (links), subordinate AS-i networks can be completely assembled and commissioned even before the central control is completely programmed.
Up to 62 standard slaves or 31 safe slaves can be connected to an AS-i network for data exchange with the superior AS-i master. Our portfolio of AS-i slaves ranges from simple I/O modules down to motor starters and frequency converters.
The power supply units centrally supply the AS-i network and the connected slaves with energy. They form an integral part of an AS-Interface network and, in combination with data decoupling, facilitate the simultaneous transmission of data and energy on the same two-wire line.
Our portfolio of system components comprises products for AS-i network analysis, AS-i slave addressing as well as range extension. Numerous further accessory components such as distributors, M12 feeders, mounting plates and cable end pieces complete the product portfolio and support a very easy and flexible assembly of the entire AS-i system.
Depending on your individual requirements, you can chose between the "small" ASIsafe Solution local and cell-spanning, system-wide ASIsafe integration with the help of the SIMATIC AS-i F-Link as gateway between ASIsafe and PROFIsafe beneath a fail-safe control.
From SIMATIC STEP 7 V5.4, AS-Interface modules by Siemens can be configured in your system with even greater comfort. STEP 7 comprises a slave selection dialog via which the modules are integrated in the respective S7 project with a mouse-click. All slave-specific profile settings (I/O and ID codes) are automatically carried out. The modules are parameterized via selection lists in plain text, doing away with the search for parameter bits in the operating instructions. A comprehensive module description text eases system documentation.
The MSS ES parameterization software forms a central part of the modular safety system (MSS) and supports the rapid and easy parameterization of safety functions as well as comprehensive diagnostics options.
The ASIMON PC software serves the configuration of the AS-Interface safety monitor. Vie the software's online function, the current state of the configured logic blocks can be read out on site and monitored in the fully graphical diagnostics view. The green/yellow/red color changeover of the blocks and connection lines provides the desired status information in an intuitive manner. This function offers valuable advantages particularly in terms of commissioning and troubleshooting.
The ASIMON V3 software offers numerous further user benefits, including fully graphical circuit diagram generation of the safety logics in transparent window technology, safe coupling of two AS-i networks, filtering of short-term one-channel interruptions in the sensor circuit, management of user- specific blocks, graphics printout of the safety logics, gradual teaching or manual entry of the ASIsafe code tables, freely selectable index assignment for integrated PLC diagnostics, immediate state signaling of relay outputs to the PLC and many further valuable functions.
AS-Interface provides comprehensive diagnostics data which can be effortlessly and immediately read out by the SIMATIC STEP 7 system. These data can be interconnected in the STEP 7 program for responding to system states and/or output on an operator panel for rapid fault rectification.
For this purpose, a fully functioning package of function blocks for S7-300/400/1200 and pre-defined screens for the color graphic displays in 6", 8" (10") and 15" version are available. The screens can be scaled via WinCC for other monitor sizes. The graphics comprise the diagnostics of AS-i master and slaves.
STEP 7 V5.5 / WinCC flexible
The following AS-i masters and links are supported:
DP/AS-i Link Advanced
DP/AS-i Link 20
IE/AS-i Link PN IO
STEP 7 V11 SP2 / WinCC V11 SP2
SIMATIC controllers with an integrated PROFINET interface offer web server functionality and enable diagnostics from any location via an Industrial Ethernet Network. Any web client, such as a PC, Multi Panel or PDA, can obtain read-access to module, program and diagnostic data from a standard internet browser. User-specific websites allow users to implement a continuous-diagnostics concept.
You can find website templates and application descriptionshere.
The AS-Interface block library for PCS 7 can be integrated in the SIMATIC PCS 7 process control system, expanding it by the option of AS-Interface system integration