Examples of Calculations
21
S7-400 Instruction List
A5E00267845-01
Examples of Calculations
You will find a few examples here for calculating the execution times for the various methods of indirect addressing.
Calculating the Execution Times for Area-Internal Memory-Indirect Addressing
Example: A I [DBD 12] with CPU 414
Step 1: Load the contents of DBD 12 (time required is listed in the table on page 20)
Address is in ... Execution Time in s
Bit memory area M
Word
Double word
0.2
0.3
Data block DB/DX
Word
Double word
0.3
0.2
Step 2: AND the input addressed in this way (you will find the execution time in the tables in the chapter entitled “List of Instruc-
tions” on page 25)
Typical Execution Time in s
Direct Addressing Indirect Addressing
0.06/0.075
:
0.06+
:
Time for A I
Total execution time:
0.18 s
+ 0.06 s
0.24 s
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