Operand Areas; Ewa 4Neb 811 - Siemens SIMATIC S5 Manual

S5-115F Manual
Table 2-1 provides further information on these operations.
Table 2-1. Permissible Methods of Representation in the Blocks
Operations
Basic operations
1. Logic operations
2. Set/Reset operations
3. Load and transfer operations
4. Timer operations
5. Counter operations
6. Comparison operations
7. Arithmetic operations
8. Block call operations
9. Other operations
10. Display construction operations
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
System operations
1. Set operations
2. Load and transfer operations
3. Block call operations
4. Arithmetic operations
5. Other operations
1 The operations listed are not permissible in OBs, PBs and SBs.
2.1.2

Operand Areas

The STEP 5 programming language has the following operand areas:
I (Inputs)
Q (Outputs)
F (Flags)
D (Data)
T (Timers)
C (Counters)
P (Peripherals) Interface from the process to the PLC (direct)
K (Constants)
OB, PB, SB, FB, DB (Blocks)
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

Method of Representation
LAD/CSF
possible in
OB
PB
Yes
No
---
1
--- 1
Interfaces from the process to the PLC (via process I/O
image)
Interfaces from the PLC to the process (via process I/O
image)
Memory for intermediate results of binary operations
Memory for intermediate results of digital operations
Memory for implementing timers
Memory for implementing counters
Defined numeric values
Program structuring aids
Introduction to STEP 5
STL
possible in
SB FB OB PB
Yes
Yes
---
1
Yes
--- 1
Yes
SB
2-3