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Examples Of Calculations - Siemens CPU 412-1 Instruction Manual

S7-400; cpu 412 series; cpu 414 series; cpu 416 series; cpu 417 series;.
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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 ...
Bit memory area M
Word
Double word
Data block DB/DX
Word
Double word
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)
Total execution time:
0.18 ms
0.06 ms
+
0.24 ms
S7-400 Instruction List
A5E00267845-01
Typical Execution Time in ms
Direct Addressing
0.06/0.075
:
Examples of Calculations
Execution Time in ms
0.2
0.3
0.2
0.3
Indirect Addressing
0.06+
Time for A I
:
21

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