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3
Safety-related conditions
External safety controller requirements
Manual – Functional Safety
14
• The switching capacity of the control must correspond at least to the maximum
permitted limited output current of the DC 24 V voltage supply.
Observe the manufacturer's instructions concerning the permitted contact
loads and fusing that may be required for the safety contacts. If the manu-
facturer provides no specific information, the contacts must be protected
with 0.6 times the nominal value of the maximum contact rating specified by
the manufacturer.
• For wiring with crossfault monitoring, the controller must feature an option for sig-
naling crossfault monitoring and trigger recognition.
• To ensure protection against unintended restart in accordance with EN ISO 14118,
the safety controller must be configured and connected in such a way that reset-
ting the control device alone does not lead to a restart. A restart may only be car-
ried out after a manual reset of the safety circuit.
• The input for the safety-related DC 24 V voltage supply of the device has an input
capacitance. For detailed information, refer to the "Technical Data "chapter of the
operating instructions of the respective device. This must be taken into account as
load when designing the switching output.
• Other requirements of the safety controller (such as protecting the output contacts
against welding) must be strictly observed. You must also observe the basic cable
routing requirements from chapter "Installation requirements".
• If the safety circuit is disconnected at 2 poles, the test pulses may not be applied
at the same time. The length of a test pulse must not exceed 1 ms. The interval
between 2 test pulses must be at least 1 s.
t
< 1 ms > 1 s
high
low
9007199938827659
29157056/EN – 09/2019