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10.4.2
Earth/Ground Fault Detector
An Earth/Ground Fault exists when the voltage
U
=0,5 U
GND
10% U
This error substantially limits the noise immunity of the AS-i communication.
Ground faults are indicated on the master´s display as well as in AS-i Control
Tools.
Information!
A ground fault in one of the two networks of a double master in a version 1 power sup-
ply for two AS-i networks causes a ground fault in the other network as well because of
the the existing galvanic connection.
Information!
To recognize ground faults the master must be grounded with its machine ground con-
nection.
10.4.3
Noise Detector
The noise detector detects AC voltages on AS-i, that are not initiated by an AS-i
master or AS-i slaves. These interference voltages can cause telegram distur-
bances.
A frequent cause are insufficiently shielded frequency inverters or improperly
routed cables.
Noises is indicated on the master´s display as well as in AS-i Control Tools.
10.4.4
Over-voltage Detector
Over-voltages are present if the conductors of an AS-i network that normally are
routed electrically symmetrical with respect to machine ground, are strongly elec-
trically raised. A cause can for example be startup procedures of large consum-
ers.
However, over-voltages do generally not interfere with the AS-i communication,
but can under certain circumstances cause incorrect sensor signals.
Over-voltages are indicated on the master´s display as well as in the AS-i Control
Tools.
114
Subject to reasonable modifications due to technical advances.
Pepperl+Fuchs Group · Tel.: Germany (6 21) 7 76-0 · USA (3 30) 4 25 35 55 · Singapore 7 79 90 91
AS-i 3.0 EtherNet/IP Gateway with integrated Safety Monitor
.) is outside of the following range:
AS-i
≤ U
≤ 90% U
AS-i
GND
Advanced Diagnostics for AS-i Masters
U
GND
AS-i
(Nominal value of
© Pepperl+Fuchs, Printed in Germany
Internet http://www.pepperl-fuchs.com
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