Specifications

AS-Interface
ASIsafe
Introduction
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Siemens IK PI · 2009
6
■ Overview
Secure communication and standard communication on AS-Interface
Safety is included
The ASIsafe concept supports the integration of safety-related
components, such as EMERGENCY STOP switches, protective
door switches or safety light arrays, directly in the AS-Interface
network. These are fully compatible with the familiar AS-Interface
components (masters, slaves, power supplies, repeaters, etc.)
according to IEC 62062/EN 50295 and are operated in conjunc-
tion with them on the yellow AS-Interface cable.
The signals of the safety sensors are evaluated by a safety
monitor which not only monitors the switching signals of the
safety sensors but also continuously checks that the data trans-
mission works correctly. The safety monitor has one or two en-
abling circuits which are configured with two channels and are
used to switch the machine or plant to the safe state. Sensors
and monitors can be connected to any points of the AS-Interface
network. Also, several monitors can be used on one network.
A failsafe controller or a special master is not required. The
master regards safety slaves like all other slaves and receives
the safety data solely for information purposes. Hence it is also
possible to expand all existing AS-Interface networks.
ASIsafe ensures a maximum response time of 40 ms. This is the
time between the signal being applied to the input of the safe
slave and the output on the safety monitor being switched off.
Tested safety
The system was tested and approved by TÜV (Germany),
NRTL (USA) and INRS (France). The transmission method
for safety-oriented signals is designed so that applications
up to Category 4 according to EN 954-1 and PL e according to
EN ISO 13849-1 or SIL 3 according to IEC 61508 respectively
can be realized.
Software
The safety-oriented applications can be compiled and trans-
ferred into the monitor using the "asimon" configuration software.
The software also enables online diagnostics.
■ Benefits
• No failsafe PLC or special master is required for the ASIsafe
Solution local (safety monitor)
• Alternatively integration in SIMATIC / SINUMERIK safety
architectures with the help of DP/AS-i F-Link (ASIsafe Solution
PROFIsafe)
• Simple system structure thanks to standardized AS-Interface
technique
• Safety-related and standard data on the same bus
• Existing systems can be expanded quickly and easily
• Optimum integration in TIA (Safety Diagnostics) and
Safety Integrated
• Safe signals can be combined in groups
• Inclusion of the safety signals in the plant diagnostics,
also on existing HMI panels
• Approved to Category 4 acc. to EN 954-1 or PL e acc. to
EN ISO 13849-1 or SIL 3 acc. to IEC 61508
• ASIsafe is certified by TÜV (Germany), NRTL (USA) and
INRS (France)
■ Application
Integrated safety technology in the AS-Interface system is used
wherever EMERGENCY STOP pushbuttons, protective door
interlocks, stop Category 0 and 1, two-hand operator controls
and light arrays now installed.
Standard PLC
Standard-Master
Standard-
Slave
Safety monitor
Safe slave with
EMERGENCY
STOP
Power
supply unit
Signal evaluation of slave/safety monitor
AS-i POWER
AS-Interface