User's Manual

Configuring the AS-Interface safety monitor
4.3 Creating and changing a configuration
ASIMON V3 - Configuration software for AS-Interface safety monitor
44 Programming and Operating Manual, Edition 09/2008, GWA 4NEB 333 1558 02 DS 02
Double channel, dependent components with debouncing
The monitoring to determine whether a safety guard is open or closed is performed by two pro-
tective switches. If this safety guard is opened or closed, the protective switches are not actu-
ated simultaneously. Moreover, the switches bounce, for example when the guard is closed
too fast. In the double channel dependent functional device with debouncing, it is, therefore,
also possible to specify a bounce time in addition to the synchronisation time. The bounce time
begins when both contacts close the first time. Within the specified bounce time, the switches
can change their state freely. After the bounce time has passed, both contacts are again que-
ried. If they are then closed and if the synchronisation time has not yet passed, the validation
is performed. The selected synchronisation time must be greater than the bounce time. If the
synchronisation time is exceeded, the start-test state results. The safety monitor also monitors
the switches to ensure that one of the two end positions "both switches open" or "both switches
closed" is always achieved.
The functional device for double channel, dependent components with debouncing can, thus,
be used for applications such as
• slow-action switch
• switches with high bounce times
Here, both the direct connection of an integrated AS-Interface slave as well as the connection
of a conventional device via a safe coupling module are possible. Local acknowledgement and/
or the startup test are available as options.
Double channel, dependent components with filtering
The monitoring to determine whether a safety guard is open or closed is performed by two pro-
tective switches. If this safety guard is opened or closed, the protective switches are not actu-
ated simultaneously. In addition, guard vibrations may result in short-term, single-channel
interruptions. This monitoring device can be used to "filter out" such interference without cau-
sing the system to be switched off. The user defines a synchronisation time, a stabilising time
and, if necessary, a tolerance time for short-term, single-channel interruptions. When switched
on, the protective switch may switch between all possible states (none, one, or both contacts
closed) during the synchronisation time.
If both contacts remain open for the duration of the stabilising time, the synchronisation time is
restarted when the contacts are again closed. If the protective switch is in an undefined state
for the duration of the stabilising time, the functional device switches to the locked error state.
Only if both contacts close within the synchronisation time and remain closed for the duration
of the stabilising time is the validation performed.
The functional device offers various possibilities for handling short-term, single-channel inter-
ruptions. Local acknowledgement and/or the startup test are available as options.
Note
These components are only available for the types of the AS-Interface safety monitor with en-
hanced function range (type 3 … type 6).
Note
These components are only available for the types of the AS-Interface safety monitor with en-
hanced function range (type 3 … type 6).