Operating System Processing Time In The Scan Cycle Checkpoint - Siemens SIMATIC ET 200S Manual

Extending the cycle time
Note that the cycle time of a user program is extended by the following:
S Time-controlled interrupt handling
S Process interrupt handling (see also Section 9.3)
S 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:
S Testing and commissioning functions such as status/control of variables or
block status
S Functions: Load block, delete block, compress block
S Communication
S Writing and reading the MMC with SFC 82 to 84
Table 9-1
Operating system processing time
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
K Base load
Q Bytes in the PI for the ET 200S I/O
D Per word in the DP area
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04

Operating system processing time in the scan cycle checkpoint

Sequence
Process image updating
Designation
Cycle and Response Times
IM 151-7 CPU
m
600 s
Times in the IM 151-7 CPU
Bus length v 1 m Bus length u 1 m
m
100 s 150
m
60 s per byte 80
m m
1 s 1
m
s
m
s per byte
s
9-3