Siemens SIMATIC S5 - Operand Areas; Ewa 4 Neb 811

S5-115F Manual Introduction to STEP 5
Table 2-1 provides further information on these operations.
Table 2-1. Permissible Methods of Representation in the Blocks
1 The operations listed are not permissible in OBs, PBs and SBs.
Supplementary operations
1. Logic operations
2. Bit test operations
3. Set/Reset operations
4. Timer and counter operations
5. Load and transfer operations
6. Conversion operations
7. Shift operations
8. Jump operations
9. Other operations
STL
possible in
SBPBOBFBSBPB
OB
LAD/CSF
possible in
Method of Representation
Operations
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a 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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a
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a
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Yes
Basic operations
1. Logic operations
2. Set/Reset operations
3. Load and transfer operations
4. Timer operations
5. Counter operations
6. Comparison operations
Yes
System operations
1. Set operations
2. Load and transfer operations
3. Block call operations
4. Arithmetic operations
5. Other operations
No Yes
Yes---
1
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1
Yes---
1
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1
7. Arithmetic operations
8. Block call operations
9. Other operations
10. Display construction operations
2.1.2 Operand Areas
The STEP 5 programming language has the following operand areas:
I (Inputs) Interfaces from the process to the PLC (via process I/O
image)
Q (Outputs) Interfaces from the PLC to the process (via process I/O
image)
F (Flags) Memory for intermediate results of binary operations
D (Data) Memory for intermediate results of digital operations
T (Timers) Memory for implementing timers
C (Counters) Memory for implementing counters
P (Peripherals) Interface from the process to the PLC (direct)
K (Constants) Defined numeric values
OB, PB, SB, FB, DB(Blocks) Program structuring aids
You will find a detailed description of all operations and programming examples in Chapter 3.
Refer to Appendix A for a listing of all operations and operands.
EWA 4NEB 811 6149-02 2-3