Siemens SIMATIC ET 200SP Manuel - Page 22

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Siemens SIMATIC ET 200SP Manuel
Parameters/address space

4.4 Oversampling

See also
ET 200SP Distributed I/O System
(http://support.automation.siemens.com/WW/view/en/58649293)
4.4
Oversampling
Function
Oversampling is the output of data in constant bus cycle segments (sub-cycles), whereby n
sub-cycles correspond to one PROFINET bus cycle. A data packet is transmitted from the
controller to the module, which outputs the packet in n constant bus sub-cycles.
Oversampling is useful whenever you require output of data with high time resolution but
without using an extremely short PROFINET bus cycle and thus fast CPU cycles.
With oversampling, a PROFINET bus cycle is divided into constant bus sub-cycles:
● Each sub-cycle returns an output value.
● The minimum PROFINET bus cycle for oversampling is 250 µs.
● You can configure oversampling for:
– Channel 0 (1-channel operation)
– Channel 0/1 (2-channel operation)
● The number of sub-cycles can be set as follows:
– From 2 to 16 for one channel
– From 2 to 8 for two channels
Requirement
Oversampling is only possible when isochronous mode is set.
Configuration
You configure oversampling with the following parameter:
● Sampling rate
Note
Do not use a reduction ratio for blocks in the case of configuration with oversampling in the
runtime groups of your user program. This will ensure that the data processing in the user
program of the CPU is synchronized with the acquisition on the module.
22
Analog output module AQ 2xU/I HS (6ES7135-6HB00-0DA1)
Manual, 09/2016, A5E03576140-AD