Introduction to STEP 5 S5-95F
Selection of the OB13 Call-Up Interval
You set the OB13 call-up interval when parameterizing the system with COM 95F. The OB13 call-up
interval must fulfill the following conditions:
OB13 call-up interval > OB13 runtime + maximum delay t of OB13 processing
If you have programmed an OB13 call-up interval that does not fulfill the above equation, this results
in a time interrupt error. In this case, the S5-95F goes into STOP.
Reference Values for OB13 Processing Delays
The OB13 processing delay depends on the loading of the system. Table 7-5 gives reference values
for an S5-95F programmable controller with a low system load. The delay of OB13 processing
depends on the following:
• Use of the OB2 and/or OB3 interrupts
• Direct accesses to external I/Os in OB13
• Configuration of external I/O modules
• Use of the failsafe SINEC L1 data exchange
• Programmer operation
Table 7-5. Reference Values for the OB13 Call-Up Delay (No Use of SINEC L1)
OB2 and OB3
Interrupt
Processing
Direct Access to
External I/Os in OB13
Configuration with
External I/Os (per
Subunit)
OB13 Call-Up
Delay
no no no external I/Os 20 ms
no yes small
(approx. 40 data bits)
30 ms
no yes large
(approx. 300 data bits)
40 ms
yes no no external I/Os 30 ms
yes yes small
(approx. 40 data bits)
40 ms
yes yes large
(approx. 300 data bits)
50 ms
a
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If you use the SINEC L1 LAN to transmit safety-related data, you must add the following times to the
values given in Table 7-5:
• Basic load for SINEC L1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 ms
(independent of whether configuration consists of one or two LANs)
• For each LAN you use to send safe data,
if the longest frame transmitted is smaller than 20 bytes . . . . . . . . . . . . . . . . . . . . . . 5 ms
if the longest frame transmitted is between 20 and 40 bytes . . . . . . . . . . . . . . . . . . . . 10 ms
if the longest frame transmitted is larger than 40 bytes . . . . . . . . . . . . . . . . . . . . . . . 15 ms
• For each LAN you use to receive safe data,
if the longest frame transmitted is smaller than 20 bytes . . . . . . . . . . . . . . . . . . . . . . 5 ms
if the longest frame transmitted is between 20 and 40 bytes . . . . . . . . . . . . . . . . . . . . 10 ms
if the longest frame transmitted is larger than 40 bytes . . . . . . . . . . . . . . . . . . . . . . . 15 ms
7-26
EWA 4NEB 812 6210-02
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