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S5-95F on SINEC L1
Specifying the Polling List
Master traffic must be guaranteed in each bus cycle. This results in the following sequence for the
polling list in the SINEC L1 bus master:
Polling list: 1-2-3-1-2-1-3
Calculating the SINEC L1 Bus Cycle Time
The SINEC L1 bus cycle time is calculated as described in section 13.4.1:
Quantity of data transmitted
SINEC L1 bus cycle time
Calculating the SINEC L1 Safety Time
The SINEC L1 safety time depends on the process being automated and is agreed between you
and the inspector at the selective acceptance test. You must determine the SINEC L1 safety time
actually required for data traffic by performing the following calculation. The safety time required
must be shorter than the SINEC L1 safety time specified by the inspector.
The SINEC L1 safety time actually required for the specified data transfers is determined as follows:
SINEC L1 Safety Time for Send for Slave 1:
The SINEC L1 safety time for Send must conform with the defined conditions (see section 13.4.2).
1st condition
SINEC L1 safety time for Send
where k
= 2 data paths
I
= 1 (nonfailsafe data transmitted frequently)
n
= 3 occurrences in the polling list
yields the result:
SINEC L1 safety time for Send=
2nd condition
The SINEC L1 safety time for Send must be 300 ms. This condition is fulfilled.
3rd condition (for double SINEC L1 channel only)
The permissible SINEC L1 safety time for Receive must be agreed with the inspector. The following
condition must be fulfilled:
SINEC L1 safety time for Receive SINEC L1 safety time for Send +500 ms.
13-32
= 6 x 20 bytes+2 x (10+4) bytes+2 x (30+4) bytes+= 216 bytes
= 216 x 2 ms + 44 x 7 ms= 740 ms
2·(k+l)·SINEC L1 bus cycle time
2 (2 + 1) x 740
3
n
ms = 1480 ms
EWA 4NEB 812 6210-02
S5-95F
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