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9M02-8978-A002-EN
Version 14
Safe-E-
Stop™
User Guide
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INPUTS 2 & 4 are unused (polarity reversible)
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RJ45 Ethernet port
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Antenna port TNC
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24Vdc power input (9-36Vdc)
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E-Stop Safety Relay outputs R1 & R2
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COMM Loss Safety Relay outputs R3 & R4
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Auxiliary dc output (same as 24Vdc input voltage but protected by a fuse)
C A U T I O N
The choice of connection will be determined by the safety level required for the target application and machine.
To achieve SIL3 capable safety levels a dual channel connection approach will be required and is
recommended, but single channels are optional for lower safety levels and are also shown below.
Additionally, it must be remembered that the Ethernet port is not safety critical, only informational, therefore the
functionality of the green button on the PSD should not be used for safety critical functionality such as restarting
the machine.
USE OF THE GREEN BUTTON FOR SAFETY CRITICAL FUNCTIONS COULD RESULT IN UNEXPECTED
ACTUATION OF FUNCTION AND MAY LEAD TO INJURY OR DEATH.
8.2.1 Single Channel Connections Example when using the COMM LOSS Relays
The following configuration combines the SIL3 function of the COMM LOSS relays with the systematic
capability of 3 provided by the E-Stop relays in a single channel configuration.
If a single PSD is always to be used, then use of the COMM LOSS relays will also provide additional
status information.
Once one PSD is ‘LINKED’, it is placed into service as an additional E-Stop and the
COMM LOSS relays are closed. If a user fails to link their PSD and confirm that it is linked, it will not be
detected and the machine could be reset unless the COMM LOSS relays are wired in series with the E-
STOP relays, this will enforce the need for a single PSD.
However, each additional PSD will not make any further difference to the COMM LOSS relays;
if
one of those additional users failed to LINK correctly and confirm LINK status, it will not be detectable via
the COMM LOSS relays. If further confirmation is required, it is possible to implement additional
verification using the Ethernet bus data and a PLC control system to ensure that one, two or a minimum
number of PSDs are Linked for operation to commence. Once linked any PSD that has a COMM LOSS
will cause the COMM LOSS and E-STOP relays to open.
Additionally, if the machine is to be run without a PSD connected at times, this will not be possible without
either overriding or not using the COMM LOSS relays, because their state will be open without a PSD
linked.
The single channel connection method below will not provide protection against an external wiring fault.