Siemens ET 7Y Series Spezifikationen Seite 167

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Cycle and Response Times
9-3
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
Extending the cycle time
Note that the cycle time of a user program is extended by the following:
Time-controlled interrupt handling
Process interrupt handling (see also Section 9.3)
Diagnostics and error handling (see also Section 9.3)
Operating system processing time
The operating system execution time for the IM 151-7 CPU is found in Table 9-1.
The specified time does not include the execution of:
Testing and commissioning functions such as status/control of variables or
block status
Functions: Load block, delete block, compress block
Communication
Writing and reading the MMC with SFC 82 to 84
Table 9-1 Operating system processing time in the scan cycle checkpoint
Sequence
IM 151-7 CPU
Operating system processing time 600 ms
Process image transfer time
The table below contains the CPU times for process image updating (process
image transfer time). The specified times can be longer as a result of interrupts
that occur or by communication involving the IM 151-7 CPU.
(Process image = PI)
The CPU time for process image updating is calculated as follows:
K + A + D = Process image transfer time, in which K, A and D equal the following:
Table 9-2 Process image updating
Designation Times in the IM 151-7 CPU
Bus length v 1 m Bus length u 1 m
K Base load 100 ms 150 ms
Q Bytes in the PI for the ET 200S I/O 60 ms per byte 80 ms per byte
D Per word in the DP area 1 ms 1 ms
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