AS-Interface Analyser
Using the Analyser
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Subject to reasonable modifications due to technical advances.
Printed in Germany
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cause directly but rather their effect. The user should examine, therefore, first of
all the possibility of an earth fault. Themed: "Not the disturbances are the problem
but a possible earth fault". For that purpose an earth fault detector in the master,
in the power supply or as an individual component is available.
Even if slaves can have different disturbance sensitivities, it is typical for this kind
of disturbance that usually several Slaves in the net are affected.
7.3.3
Error by Bad Contact
Disturbances caused by a bad contact can be proven in a similar way. Typically
the error always concerns a certain slave. This can be proven most simply in the
online statistics (if necessary during a longer period). If a bad connection leads
more frequently to telegram repetitions, without the slave failing completely, this
can be seen in the "Consecutive Errors". Fig. 17 shows this as cut-out from a trace.
Fig 17:
A slave with the address 28 with a bad contact is installed in a net. During storage
this Slave is moved. By filtering on this slave 28 individual failures are indicated first
(lines 6509f, 6515ff, 6523f), then a loss up to a configuration error (starting from line
6529) and finally the resumption into the net (line 6538 - 6546).
7.3.4
Error by Overloaded Slaves
If their in- or outputs are overloaded or another (external) malfunction is present
some slaves break up the communication. A reset is released inside the slave. But
after the removal the cause for this reset the slave is retaken to communication. In
contrast to the error by bad contact bad contact one will find consecutive errors of
the class 6 only. In the trace lines like 6509f, 6515ff and 6523f shown in fig. 17
Summary of Contents for as-interface ANALYSER 3RK1 904-3AB01
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