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
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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
XXX
1)
Set/reset operations X
only
RQ 32.x
RI 60.x
XXX
1)
Load and transfer operations X
2)
-X
2)
XX
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
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