Instruction list for S7-300 - DCE FEL ČVUT v Praze
Instruction list for S7-300 - DCE FEL ČVUT v Praze
Instruction list for S7-300 - DCE FEL ČVUT v Praze
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Execution Times with Indirect Addressing Execution Times with Indirect Addressing<br />
Examples of Calculations (<strong>for</strong> the CPU 314)<br />
You will find a few examples here <strong>for</strong> calculating the execution<br />
times <strong>for</strong> the various methods of indirect addressing. Execution<br />
times are calculated <strong>for</strong> the CPU 314.<br />
Calculating the Execution Times <strong>for</strong> Area-Internal<br />
Memory-Indirect Addressing<br />
Example: A I [DBD 12]<br />
Step 1: Load the contents of DBD 12 (time required is <strong>list</strong>ed<br />
in the table on page 21)<br />
Address is in ... Execution Time in s<br />
Bit memory area M<br />
Word<br />
Double word<br />
0.7<br />
2.3<br />
Data block DB/DI<br />
Word<br />
2.8<br />
Double word 3.9<br />
Step 2: AND the input addressed in this way (you will find<br />
the execution time in the tables in the chapter entitled<br />
“List of <strong>Instruction</strong>s”)<br />
Typical Execution Time in s<br />
Direct Addressing Indirect Addressing<br />
0.2<br />
:<br />
Total execution time:<br />
3.9 s<br />
+ 2.0 s<br />
= 5.9 s<br />
Time <strong>for</strong><br />
A I<br />
<strong>S7</strong>-<strong>300</strong> <strong>Instruction</strong> List <strong>S7</strong>-<strong>300</strong> <strong>Instruction</strong> List<br />
22 EWA 4NEB 710 6087-02 EWA 4NEB 710 6087-02<br />
23<br />
2.0+<br />
:
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