S5-95F
Blocks and Their Functions
9
Blocks and Their Functions
The STEP 5 programming language offers you various blocks, such as organization blocks (OBs),
program blocks (PBs), function blocks (FBs) and data blocks (DBs). Sequence blocks (SBs) are
available for programming of sequencers.
The following chapter describes:
•
the meaning of the organization blocks
•
the blocks integrated in the S5-95F
9.1
Organization Blocks
Table 9.1 lists the organization blocks of the S5-95F.
Table 9-1. Overview of Organization Blocks
OB No.
Function
OB1
Cyclic program processing
OB2
Interrupt-driven program processing (OB2 interrupts)
OB3
Interrupt-driven program processing (OB3 interrupts)
OB13
Time-controlled program processing
OB21
Restart procedure after manual POWER ON (STOP RUN)
OB22
Restart procedure after power recovery
OB31
Scan time triggering of hardware watchdog
OB34
Procedure after battery failure
OB37
Error handling
OB251
PID algorithm
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
Table 9-2. Restrictions of the STEP 5 Commands in Various Blocks
X = permissible in the OB and in PBs, SBs and FBs called there
0 = permissible only in called-up FBs
- = not permissible
1) Impractical with PII
2) Direct access to external I/Os not permissible
Command
OB 1
OB 34
OB 37
OB 2
OB 3
OB 13
OB 21
OB 22
Boolean logic operations
X
only with
IB 32, 33,
56, 60
X
X
X
1)
Set/reset operations
X
only
RQ 32.x
RI 60.x
X
X
X
1)
Load and transfer operations
X
2)
-
X
2)
X
X
1)2)
Timer, counter, comparison,
block call operations
X
only BE
X
X
X
Supplementary operations
0
-
0
0
0
System operations
0
-
0
0
0
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
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EWA 4NEB 812 6210-02
9-1