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Introduction to STEP 5
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
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
no
no
no
yes
yes
yes
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
(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
if the longest frame transmitted is between 20 and 40 bytes
if the longest frame transmitted is larger than 40 bytes
•
For each LAN you use to receive safe data,
if the longest frame transmitted is smaller than 20 bytes
if the longest frame transmitted is between 20 and 40 bytes
if the longest frame transmitted is larger than 40 bytes
7-26
> OB13 runtime + maximum delay t of OB13 processing
Direct Access to
External I/Os in OB13
no
yes
yes
no
yes
yes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration with
External I/Os (per
Subunit)
no external I/Os
small
(approx. 40 data bits)
large
(approx. 300 data bits)
no external I/Os
small
(approx. 40 data bits)
large
(approx. 300 data bits)
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
S5-95F
OB13 Call-Up
Delay
20 ms
30 ms
40 ms
30 ms
40 ms
50 ms
20 ms
5 ms
10 ms
15 ms
5 ms
10 ms
15 ms
EWA 4NEB 812 6210-02
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