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AS-Interface Analyser
Start traces and recorded frames before trigger:
Similarly as with a memory oscilloscope, you can set a various number of tele-
grams to be saved before the trigger event. This causes that the stored trace does
not only begin at the trigger time but that it also shows a given number of data pak-
kets directly before accomplishing the last trigger condition. Thus the trace looks
backwards to the direct past from the trigger time still another piece into. So a pre-
history analysis is possible.
You can specify in the menu "Options / Trigger Point" the size of the telegrams
of this prehistory view. It can various between 0 and 256.000.
Also when triggering internally (or externally) the trace procedure must be started
manually (fig. 12a). This start causes that the analyser takes up data packets im-
mediately as "frames before trigger event". However, these are overwritten again
and again until the last trigger condition is true. In fig 12b and c a "preview" from
500 data packets is adjusted.
The further "tracing" begins when the trigger events of the levels 1 - 3 arise
(fig. 12b and c). After the stop of the trace the data packets are loaded automati-
cally into the PC (fig. 12d and e). This can be interrupted if necessary.
The last trigger condition is marked red in the trace.
Delayed tracing: By adjusting a negative "advance trigger" the start of the trace
can be further retarded. It starts an adjustable number of packets only after the
trigger event.
5.7.4.2
External Trigger
Alternatively is it possible to start a trace by an external trigger. That is done by an
external voltage of 24 V (+6 V) at the external trigger input. The trigger is released
with 0 V or with 24 V depending upon the setting.
The settings takes place with the help of the trigger mask (fig 13) in which the ex-
ternal trigger is activated. The external trigger can be selected either as "Low ac-
tive" or as "High active". In the first case the trigger condition is fulfilled if no voltage
is set to the input. In the second case a voltage of 24 V releases the trigger event.
The field "Number of Trigger Conditions" serves switching the in- and output of the
trigger level ("1" and/or. "0").
The field "external Trigger Input" of the trigger mask is independent of the red mar-
ked fields of the internal trigger (according to a logical OR-conjunction with these
fields). If an internal and an external trigger condition are adjusted, then the trigger
Subject to reasonable modifications due to technical advances.
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Functions of the Analyser
You can trigger xx1x on the slave answer with read status calls to
detect a periphery error.
There is a template for this as well.
In order to trigger on the releasing of the safety monitor, attach the
trigger input to the reporting exit of the monitor and trigger then on
low active on the external trigger input.
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