S5-95F Introduction to STEP 5
7.1.2 Operand Areas
The STEP 5 programming language has the following operand areas.
I (inputs) Interfaces from the process to the programmable controller
Q (outputs) Interfaces from the programmable controller to the process
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) Interfaces from the process to the programmable controller
K (constants) Defined numeric values
OB, PB, SB
FB, DB (blocks) Program structuring aids
Refer to Appendix A for a listing of all operations and operands.
7.1.3 Circuit Diagram Conversion
If your automation task is in the form of a circuit diagram, you must convert it to STL, CSF, or LAD.
EWA 4NEB 812 6210-02
7-3
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