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Siemens Simatic S7-300 マニュアル
Prerequisites
S The DP master and DP slave must support clock synchronization. STEP 7 as of
Version 5.2 is required.
Mode: clock synchronization
The following conditions apply to clocked mode:
Filter and processing time T
and made available in the transfer buffer
(the specified value for T
hardware interrupt or diagnosis)
Includes an input delay of
T
DPmin
Diagnostic interrupt
Note
In clocked mode, the integration time for the module is always set to "none" or
"interference frequency", regardless of the parameter assignment in STEP 7.
Hardware interrupt functionality is not possible in clocked mode.
Calculation of the filter and processing time
The same time conditions apply regardless of the number of channels
parameterized. The point of time in relation to the clock signal at which a specific
channel is read in is calculated on the basis of the following formula:
_CH = (channel number +1) x 52 ms + tv; tv = 100 to 190 ms
T
WE
CH7
CH6
52ms 52ms
T
i
Figure 6
Figure 7
18
between the actual values being read in
WE
applies regardless of the activation of the
WE
A/D conversion
CH5
CH4
CH3
CH2
52 ms
52ms
52ms
52ms
Calculation of the filter and processing time
Product Information on the Manual S7-300 Module Specifications, Edition 11/2002
T
WE
Internal processing (tv)
CH1
CH0
52ms
52ms
516 to 606 ms
80 ms
3.5 ms
max. 4 x T
100ms ... 190ms
A5E00213444-02
DP