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S5-115U Manual
7.1.2 Operand Areas
The STEP 5 programming language has the following operand areas:
I
Q
F
D
T
C
P
K
OB, PB, SB, FB, DB (blocks)
BS
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 811 6130-02b
(inputs)
interfaces from the process to the PLC
(outputs)
interfaces from the PLC to the process
(flags)
memory for intermediate results of binary operations
(data)
memory for intermediate results of digital operations
(timers)
memory for implementing timers
(counters)
memory for implementing counters
(input/output
interface between process and
modules)
programmable controller
(constants)
defined numeric values
program structuring aids
(system data)
interface between operating system and control
program
Introduction to STEP 5
7-3
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