S5-95F Rules for Failsafe Operation of an S5-95F
18.19.2 SINEC L1 Safety Time for Send
The S5-95F controls transmission of failsafe frames via an internal timer. The S5-95F 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 paths 1 and 2; then, if there is enough time left, it
transmits non-failsafe frames.
The S5-95F computes the initial value for the internal timer from the lower of the two SINEC L1
safety time for Send values (data path 1 and data path 2). The formula for the initial internal timer
value is:
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 time for send must fulfil the following conditions:
1st condition
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2·(k+l)·SINEC L1 bus cycle time
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SINEC L1 safety time for Send
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k= Specified number of failsafe data paths for transmitting, where
k=1 for one failsafe data path
k=2 for two failsafe data paths
l= Factor for non-failsafe data paths, where
l=0, when non-failsafe data is transmitted only rarely or not at all
l=1, when non-failsafe data is transmitted frequently
n= Number of times the S5-95F (node number of transmitter) is polled in the SINEC L1 polling list
If the S5-95F is polled more than once, its node number must be evenly distributed throughout
the list, e.g.: 1 2 3 4 2 5 6 2 7 8 2 9
SINEC L1 bus cycle time = Number of frame bytes (plus 4 bytes for failsafe frames)×2 ms
+ Number of failsafe data paths in the entire SINEC L1
network×44 ms
2nd condition
The SINEC L1 safety time for Send must be 300 ms
3rd condition (double SINEC L1 bus only)
This condition must be fulfilled when using a double SINEC L1 bus:
SINEC L1 safety time for Receive SINEC L1 safety time for Send + 500 ms
4th condition (for single SINEC L1 bus only)
This condition must be fulfilled when using a single SINEC L1 bus:
SINEC L1 safety time for Receive SINEC L1 safety time for Send + 200 ms
EWA 4NEB 812 6210-02
18-41
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