Siemens SIMATIC S7-200

Execution Times for STL Instructions
F-2
S7-200 Programmable Controller System Manual
A5E00066097-02
Execution Times
Accessing certain memory areas, such as AI, AQ, L, and accumulators, requires
additional execution time. Table F-3 provides a factor to be added to the basic
execution time for each operand access of these memory areas.
Table F-3 Execution Time Adder for Accesses to Selected Memory Areas
Memory Area
S7-200 CPU
Analog Inputs (AI) 149 µs
Analog Outputs (AQ) 73 µs
Local memory (L) 5.4 µs
Accumulators (AC) 4.4 µs
Basic Execution Times for STL Instructions
Table F-4 lists the basic execution times of the STL instructions for each of the
S7-200 CPU modules.
Table F-4 Execution Times for the STL Instructions (in µs)
Instruction
Description
S7-200 CPU
(in µs)
= Basic execution time: I
L
SM, T, C, V, S, Q, M
0.37
19.2
1.8
+D Basic execution time 55
-D Basic execution time 55
*D Basic execution time 92
/D Basic execution time 376
+I Basic execution time 46
-I Basic execution time 47
*I Basic execution time 71
/I Basic execution time 115
=I Basic execution time: local output
expansion output
29
39
+R Basic execution time
Maximum execution time
110
163
-R Basic execution time
Maximum execution time
113
166
*R Basic execution time
Maximum execution time
100
130
/R Basic execution time
Maximum execution time
300
360