ASIsafe – Safety is included

ASIsafe enables the integration of safety-related components, such as EMERGENCY-STOP pushbuttons, protective door switches or safety light arrays, in an AS-Interface network. These are fully compatible with the familiar AS-Interface components (masters, slaves, power supplies, repeaters, etc.) in accordance with IEC 62026-2 and are operated in conjunction with them on the yellow AS-Interface cable.

Tested safety

The transmission method for safety-related signals is released for applications up to PL e according to EN ISO 13849‑1 and up to SIL 3 (IEC 61508/EN 62061).

Higher-level control

Nodes on the AS-Interface bus are as usual controlled in operation by the standard program of the higher-level SIMATIC (F) CPU or by a SINUMERIK control.

Configuring safety functions

In order to implement safety functions, the information from the safety and standard nodes must be combined logically and further parameters set. The configuration of the safety functions depends on the safety solution being used:

• AS‑i safety solution with F‑CPU:
  In conjunction with the modular safety AS-i master, which is formed by combining the CM AS-i master ST and F-CM AS-i Safety ST modules in an ET 200SP station, all safety functions and combinations are configured via STEP 7 and processed in the controller (F-CPU) by the fail-safe program.
• AS‑i safety solution with local evaluation by MSS:
  In conjunction with the Modular Safety System all safety functions and combinations are configured using the MSS ES software and processed in the MSS central unit.

AS‑i safety solution with F‑CPU

AS-Interface configuration with AS-i Master modules in the ET 200SP

The AS-i communication modules in the ET 200SP facilitate the use of AS-Interface under fail-safe SIMATIC or SINUMERIK controllers.

The assignment of tasks is as follows:

• Acquisition of safety-related signals via safe input slaves on the AS-Interface bus.
  Further signals can be detected through other F‑DI modules of the SIMATIC.
• Evaluating and processing the signals through the existing failsafe SIMATIC or SINUMERIK controller
• Reacting by means of safety output modules on the AS‑Interface bus
  or other SIMATIC F‑DQ modules

Simple combination of the CM AS‑i Master ST and F‑CM AS‑i Safety ST modules in one ET 200SP station results in a powerful, safety-oriented router between PROFINET (or PROFIBUS) and AS‑Interface, which can be expanded further in a modular fashion with further I/O modules of the ET 200SP.

Expansion variants for almost every application are possible in this way. Besides the single AS-i master, double, triple or generally multiple masters can be realized with or without fail-safe functionality.

AS‑i safety solution with local evaluation by MSS

AS-Interface structure with 3RK3 Modular Safety System (MSS)

The local AS‑i safety solution uses the 3RK3 Modular Safety System (MSS) for safety-related processing. In this case, one standard controller (i.e. no F‑CPU) and one standard AS‑i Master are sufficient.

The assignment of tasks is as follows:

• Acquisition of safety-related signals via safe input slaves on the AS-Interface bus.
  Further signals can be detected via F‑DI inputs of the central unit or the expansion modules of the MSS.
• Evaluating and processing the signals via the central unit of the MSS
• Reaction via safety output modules on the AS‑Interface bus
  or via F‑DQ outputs of the central unit or expansion modules of the MSS