9
UK
Note: safe relay output
The safe relay output is implemented with two positively driven relay
contacts� If one of the two internal relays does not switch (e�g� due to
fusing of the contacts), this is detected in the safe output module�
The relay contacts 13-14 and 23-24 are potential-free normally open
contacts�
Attention!
The wiring influences the achievable control category.
The requirements for external wiring and the selection of the
connected switching contacts refer to the functionality to be
accomplished and to the required control category (EN 954-1
/ ISO 13849-1 or EN/IEC 61508). The control category is either
determined by means of a risk analysis (e.g. to EN 1050) or taken
from a C standard. The control category or SIL level of the AS-i safety
monitor must at least correspond to the control category or SIL level
necessary for the application.
6 Response times
The response time of the safe AS-i relay output module to a safety request is
maximum 50 ms from the application of the code sequence until the switch-off of
the safe relays�
Calculation of the total response time
For the calculation of the response time of the total system, the response times of
the other components also have to be added (mechanical switching contacts, data
transmission, safety monitor and external relays or contactors possibly connected
to the safe relay output)�
Here, the switching times of the mechanical contacts (e-stops) and external relays
or contactors possibly connected to the relay output of the output module have not
been taken into account�
