RFC 4072S
170 / 272
PHOENIX CONTACT 108580_en_02
Safety notes for starting applications
Take the following into consideration when determining and programming the start condi-
tions for your machine or system:
– The machine or system may only be started if it can be ensured that nobody is present
in the danger zone.
– Meet the requirements of EN ISO 13849-1 with regard to the manual reset function. The
machine must not be set in motion and/or a hazardous situation must not be triggered
by the following actions, for example:
– Switching on safe devices
– Acknowledging device error messages
– Acknowledging communication errors
– Acknowledging block error messages in the application
– Removing startup inhibits for safety functions
Observe the following when programming/configuring the safety logic:
– Switching from the safe state (substitute value = 0) to the operating state can generate
an edge change (zero/one edge).
– In the safety logic, take measures to prevent this edge change resulting in unexpected
machine/system startup or restart.
Note for starting applications
Also observe these notes to prevent unexpected machine startup following acknowledg-
ment by means of operator acknowledgment.
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