Safety engineering with AS‑Interface in the SIMATIC ET 200SP, including typical circuit diagram
Function Manual, 08/2020, A5E44991382002A/RS-AB/002
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3.1 AS-Interface
3.1.1 AS-Interface basics
AS-Interface is an industrial fieldbus system and international standard in accordance with
IEC/EN 62026-2.
AS-Interface (in short: AS-i) stands for "Actuator Sensor Interface". It was developed to
connect numerous individual sensors and actuators in a system to the PLC as simply as
possible:
• Straightforward bus system with space-saving slave modules directly in the field
• Data transmission and power supply over a single unshielded 2-wire flat cable
• Extremely fast installation and integrated fast connection system (insulation piercing
method)
• Real-time capable system response time
• Economically attractive replacement for elaborate cable harnesses
AS-Interface transmits standard signals and safe signals, e.g. for safety doors or emergency
stop buttons, together on one AS-i cable.
With safety-related sensors in particular, the savings potential can be fully exploited because
the dual cabling for two-channel safety sensors is only necessary up to the safe AS-i input
module.
For safety sensors with integrated AS-i interface, the sensor cables and their protected
routing are completely eliminated.
The safe AS-i signals are transmitted directly to a safe PLC, where they can be further
processed.
Siemens AS-i masters and Siemens AS-i modules are integrated in SIMATIC STEP 7, and can be
inserted into the configuration at the click of a mouse.
• Familiar work environment since the procedure for the AS-Interface network configuration
with Siemens AS-i modules is the same as for other SIMATIC components.
• Problem-free data management and documentation because the configuration of the
Siemens AS-i master and the associated AS-i network along with all other SIMATIC
controller components is stored in one STEP 7 project.
• In the STEP 7 program, the AS-i signals are accessed in the same way as by other I/O
modules.
• Safe AS-i signals are easily forwarded to the F-CPU or SINUMERIK via the Siemens
F-CM AS-i Safety ST module, without external PC programs or additional file management.
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