ASIMON V3 - Configuration software for AS-Interface safety monitor
Programming and Operating Manual, Edition 09/2008, GWA 4NEB 333 1558 02 DS 02 37
Configuring the AS-Interface safety monitor 4
Configuring the AS-Interface safety monitor
The AS-Interface safety monitor is a universally usable protective device and can, therefore,
be configured for a very wide range of applications.

4.1 Function of the AS-Interface safety monitor

The functional task of the AS-Interface safety monitor is to continuously specify the state(s) of
the OSSD(s) in accordance with the configuration specified by the user based on the states of
the configured devices and to activate or deactivate the assigned safe switching outputs or
safe actuators.
The ASIMON software automatically arranges the devices in the respective windows during
configuration.
Each device can take on two states:
ON state (switched on, logical "1")
This state means that the device has agreed to validate the circuit, i.e. to activate the safe
switching outputs. Depending on the device type, various conditions must first be met.
OFF state (switched off, logical "0")
This state means that the device has not agreed to validate the circuit, i.e. it results in the
switching off of the safe switching outputs.
In the first step of the evaluation, the states of all monitoring, logic and EDM devices are linked
to one another by means of a global logic AND function, i.e. only when all configured monito-
ring, logic and EDM devices have the ON state is the result of the AND function equal to ON.
In principle, the device states are evaluated in the same way as in an electrical safety circuit in
which all safety switch elements are connected in series and validation is possible only when
all contacts are closed.
In the second step, the start devices which determine the startup behaviour of the OSSD are
evaluated. A start device enters the ON state when the result of the global AND function from
the first step of the evaluation is equal to ON and when the respective start condition is fulfilled.
With regard to the start condition, the start devices have a lock. The start condition must the-
refore only be fulfilled once. A start device is reset (OFF state) when the result of the global
AND function from the first step of the evaluation returns the OFF state. The states of the start
devices used are linked to one another with an OR function, i.e. only one of the start devices
needs to be in the ON state in order for the internal validation of the circuit to occur.