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S5-95F on SINEC L1
13.4.2 SINEC L1 Safety Time for Send
The S5-95F controls transmission of failsafe frames via an internal timer. The S5-95F always
restarts the timer as soon as it expires. As long as the internal timer is running, the S5-95F
transmits (during one timer cycle) the failsafe frames over data path 1 and data path 2; then, if
enough time is left, it transmits nonfailsafe frames.
The S5-95F computes the initial value of the internal timer from the smaller of the two SINEC L1
safety times for Send (data paths 1 and 2) as follows:
Internal timer = 0.5 x SINEC L1 safety time for Send - 100 ms
Conditions for the SINEC L1 Safety Time for Send
The SINEC L1 safety time for Send must fulfill the following conditions:
1st condition
SINEC L1 safety time for Send
k= Number of failsafe data paths initialized for Send, where
k=1
for one failsafe data path
k=2
for two failsafe data paths
l= Factor for nonfailsafe data traffic, whereby
l=0,
when nonfailsafe data is never or only rarely transmitted
l=1,
when nonfailsafe data is transmitted frequently
n= Number of occurrences of the S5-95F (station number of the transmitter) in the SINEC L1
polling list
If the S5-95F appears more than once in the polling list, its station number must be evenly
distributed throughout the list. A sample polling list might be: 1 2 3 4 2 5 6 2 7 8 2 9
SINEC L1 bus cycle time =
2nd condition
The SINEC L1 safety time for Send must be 300 ms.
3rd condition (for double SINEC L1 bus only)
The following condition must be fulfilled when using a double SINEC L1 channel:
SINEC L1 safety time for Receive SINEC L1 safety time for Send + 500 ms
4th condition (for single SINEC L1 channel only)
The following condition must be fulfilled when using a single SINEC L1 channel:
SINEC L1 safety time for Receive SINEC L1 safety time for Send +200 ms
13-28
2·(k+l)·SINEC L1 bus cycle time
Number of frame bytes (plus 4 bytes in the case of failsafe
frames)×2 ms
+
Number of failsafe data paths in the entire SINEC L1
network×44 ms
n
EWA 4NEB 812 6210-02
S5-95F
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