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S5-95F
13.4
SINEC L1 Safety Times
On a failsafe SINEC L1, the S5-95F differentiates between two types of safety time: The SINEC L1
safety time for Receive and the SINEC L1 safety time for Send. The safety times may be specified
separately for each data path (i.e. as many as four different safety times may be selected).
13.4.1 SINEC L1 Safety Time for Receive
Definition:
The SINEC L1 safety time for Receive defines a time period for failsafe data paths
during which the interfaced node must receive at least one valid frame.
The SINEC L1 safety time for Receive is dependent on the automated process and on the peers'
control program. It requires approval, and must be endorsed by the inspector at the time of the
selective acceptance test.
At that time, you must agree with the inspector on
•
the SINEC L1 safety time for Receive and
•
how the system is to respond when no valid frame is received within that time period
for each failsafe data path.
Note
It is not necessary to transmit and receive at least one useful frame within the SINEC L1
safety time. If need be, the operating system transmits additional test frames,
unbeknownst to the user, for monitoring the bus.
Interval for Receiving Frames
Note
Please note that the S5-95F cannot receive a new frame until it has processed the
previous one. You should therefore arrange communications between nodes so that
frames are received at least 100 ms apart, otherwise the S5-95F may not accept the
next frame.
EWA 4NEB 812 6210-02
S5-95F on SINEC L1
13-25
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