Introduction to STEP 5
S5-90U/S5-95U
The STEP 5 programming language has the following three operation types.
•
Basic
•
Supplementary
•
System
Table 7-1 provides further information on these operations.
Table 7-1. Comparison of Operation Types
STEP 5 PROGRAMMING LANGUAGE
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Supplementary
Operations
Basic Operations
System Operations
Application
Only in function
blocks
In all blocks
Only in function
blocks
Methods of
representation
STL
STL, CSF, LAD
STL
Special features
For users with good
system knowledge
Refer to Chapter 8 for a description of all operations and programming examples.
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.
7-2
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