Calculation Of The Filter And Processing Time - Siemens SIMATIC S7-300 Reference Manual

Programmable logic controllers module data

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Analog Modules

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:

_CH = (Channel number +1) x 52 ms + tv; tv = 119 to 209 ms

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 ms 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.

A/D conversion

Calculation of the filter and processing time

internal processing (tv)

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

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