PCD0
Electrical installation
Page 122
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SAIA-Burgess Controls Ltd.
(HB_PCD0 26 766_E2.DOC)
26/766 E2
6.7
Emergency stop switches
The switches and information outlined in this section are examples of
setting up emergency stop devices. They are not generally applicable
and cannot be used in every application.
Follow the safety guidelines and guidelines for preventing accidents
(e.g. machinery safety directive) and the division in safety categories.
Emergency stop devices according to IEC 204 must be operational in
all operating modes of the plant or the system.
If the emergency stop is released the bus node must restart without
uncontrolled or undefined responses.
The examples refer to bus nodes with 8I/O expansion modules fitted
with combination channels.
If combination channels are used and emergency stop is triggered the
power supply to the module and the sensors and actuators must be
turned off at the same time. It is therefore a good idea to supply power
to sensors and actuators via the modules.
If a separate power supply is used it must be turned off when the
emergency stop is triggered.
