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S5-115U Manual
Timed-interrupt OBs interrupt the cyclic program after every STEP 5 operation. Timed-interrupt
OBs cannot interrupt the following:
•
Integral function blocks
•
OB6
•
Process interrupts (OB2 to 5).
Timed-interrupt OBs themselves can be interrupted by OB6 or by process interrupts (OB2 to 5)!
Please note that the call intervals may vary as a result.
The order of priority of the timed-interrupt OBs is as follows:
Highest priority:
Lowest priority:
Please note the following also:
•
The "IA" operation can be used to disable the calling of all timed-interrupt OBs and this can
be enabled again with the "RA" operation. A call request can be stored while the call itself is
disabled.
•
If timed-interrupt OBs are to be processed in the RESTART OB (OB21, OB22), you must enable
interrupts with "RA" in the RESTART OB
•
The block nesting depth of 32 levels must not be exceeded even when processing a time-
controlled OB.
•
If a time-controlled OB used "scratchflags" which are also used in the cyclic control program,
the "scratchflags" must be saved in a data block while the timed-interrupt OB executes.
System
Absolute
Data Word
Address
SD 97
EAC2
SD 98
EAC4
SD 99
EAC6
SD 100
EAC8
Setting an Interval Time of 1 sec. for OB13:
OB 21
:
JU
FB 21
NAME
:
TIME ON
.
.
EWA 4NEB 811 6130-02b
OB13
OB12
OB11
OB10.
Table 7-5. Parameter Block for Time OBs
High Byte
Time interval for OB13
Time interval for OB12
Time interval for OB11
Time interval for OB10
OB 22
:JU
FB 21
NAME
:TIME ON
.
.
Introduction to STEP 5
Low Byte
(0 to FFFF
·10 ms)
10 (=100 ms)
H
(0 to FFFF
·10 ms)
H
(0 to FFFF
·10 ms)
H
(0 to FFFF
·10 ms)
H
FB 21
NAME
:TIME ON
:L KF +100
:T BS 97
:BE
Default
0 (=no call)
0 (=no call)
0 (=no call)
7-21
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