Name: Siemens SIMATIC S7-300 Module data
Brand: Siemens
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Analog Modules

4-133

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

”Software filter 8 channels” mode

In “Software filter 8 channels” mode, the analog/digital conversion occurs in exactly

the same way as in “hardware filter 8 channels” mode. That is to say, as the

module contains four analog/digital converters (ADC), all four of the ADCs convert

simultaneously for channels 0, 2, 4 and 6. Once the even-numbered channels are

converted, all the ADCs convert simultaneously for the odd-numbered channels 1,

3, 5 and 7 (see Figure 4-43).

Scan time

Start analog conversion

(simultaneous)

K0 K2 K4 K6

K1 K3 K5 K7

Start analog conversion

(simultaneous)

Figure 4-43 Software filter 8 channels scan time

Scan time of the module

The channel conversion time depends, however, on the programmed interference

frequency suppression. When you set an interference frequency of 50 Hz, the

channel conversion time including communication time is 30 ms. When you set an

interference frequency of 60 Hz, the channel conversion time is 25 ms. When you

set an interference frequency of 400 Hz, the channel conversion time is reduced to

8 ms. As with 8-channel hardware filter mode, the module must be switched over

by means of opto MOS relays with a time of 12 ms for switching to the other

channel of the group. This relationship is shown in the table that follows.

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