Siemens SIMATIC ET 200AL System Manual page 1407

What you should know about analog technology
2.16 Conversion time of an analog module
Conversion time for high-speed analog modules
High-Speed analog modules (HS modules) are designed for faster processing of signals.
HS modules offer fewer diagnostics and measurement types than standard modules
(ST modules). You can find more information on HS modules in the section High-Speed
analog modules (Page 113).
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Analog value processing
Function Manual, 06/2014, A5E03461439-AC