Analog Modules
4-102
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Calculation of the filter and processing time
Independent of the number parameterized channels, the same time conditions are
always valid. The time related to the clock signal for the reading of a specific
channel is calculated according to the formula:
T
WE
_CH = (Channel number +1) x 52 s + tv; tv = 119 to 209 s
CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0
52s52s52s52s52s52s52s52s 209s
A/D conversion internal processing (tv)
T
WE
Figure 4-38 Calculation of the filter and processing time
Explanation of the mode of operation in synchronous operation
The module begins with the A/D conversion of channel 7 and saves this result
internally. Then channels 6...0 are converted sequentially at intervals of 52 s in
the same way. After a further internal processing time the result becomes available
to all converted channels at the backplane bus for collection by the CPU.
Further information
Further information on synchronicity can be found in the Online help of STEP 7, in
the manualLocal peripheral system ET 200M and in the manual Synchronicity.
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