Setting The Safety Times - Siemens SIMATIC CP 541 Manual

CP 541 with S5-95F/S5-1 15F
5.3.4

Setting the Safety Times

Introduction
Safety Time for
Receiving in the
S5-95F
Step
1 Verify the condition for the SINEC L1 safety
time for receiving, using the formula on Page
5-14.
2 Subtract the local cycle time for receiving of
the S5-95F from the specified SINEC L1
safety time for receiving.
3 Round this time down to the next multiple of
100 ms.
4 Enter this value as SINEC L1 safety time for
receiving in COM 95F.
Safety Time for
Sending in the
S5-95F
Step
1 Calculate the local cycle time for sending.
2 Double this time.
3 Verify the conditions for S5-95F.
4 Round up the resultant time to the next mul-
tiple of 100 ms.
5 Enter this value in COM 95F.
5-16
Explained in the following are the actions for setting the safety times in the
failsafe programmable controller.
Proceed as follows to determine the SINEC L1 safety time for receiving for
an S5-95F.
Action
Proceed as follows to determine the SINEC L1 safety time for sending for an
S5-95F.
Action
Meaning
The calculated value must be less than the
SINEC L1 safety time for receiving.
The local cycle time for receiving must be
subtracted from the SINEC L1 safety time,
because the received messages will be inter-
mediately stored in the CP 541.
You can only specify the receive safety time
in COM 95F in multiples of 100 ms.
–
Meaning
See Section 5.3.2.
This replaces condition 1 in the manual:
S5-95F Programmable Controller, S5-95F Programmable Controller
SINEC L1 safety time for sending.
See the manual: S5-95F Programmable Con-
troller, SINEC L1 safety time for sending
(conditions 2-4).
–
Communications Processor CP 541
EWA 4NEB 812 6188-02