Siemens ISI EN 50295 Brochure page 100

AS-Interface Slaves
Modules with special functions
Earth fault detection modules
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Overview
"... Earth faults in control circuits should neither lead to uninten-
tional start-up nor to dangerous motion of a machine and they
must not hinder shutdown of the machine (EN 60204, Part 1 or
DIN VDE 0113)".
The AS-Interface earth-fault detection module has been devel-
oped to ensure that these requirements can be met more easily
in the future. This module from the SlimLine Series allows earth
faults in AS-Interface installations to be reliably detected and re-
ported.
The following earth faults are detected:
• Earth fault in AS-i "+"
• Earth fault in AS-i "-"
• Earth fault in sensors and actuators that are supplied from the
AS-Interface voltage
In each case, only one module is necessary for each AS-Inter-
face network.
6
Typical connections
6/100 Siemens IK PI · 2004
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Function
The earth fault is detected by the module, indicated via a LED
and signaled via two signaling outputs (1 = no earth fault /OK;
2 = earth fault/fault. The earth fault alarm is stored in the module.
The module can only be reset after the earth fault has been rec-
tified by switching off the AS-Interface voltage via a reset button
or via a high signal on the floating remote-reset input. The reset
button can also be used for checking correct functioning of the
module. External auxiliary voltages are not monitored for earth
faults by this module.
Note: The earth fault detection module is a passive module with-
out an IC. Therefore it does not require an individual address in
the AS-Interface network.