Siemens SIMATIC ET 200S Manual page 250

Interface Modules
Interference Frequency Suppression
The frequency of your alternating voltage system can affect measured values
negatively, particularly in the case of both measurements in small voltage ranges
and thermocouples. Specify here the dominant line frequency in your system
(50 Hz or 60 Hz).
The interference frequency suppression parameter is valid for all analog electronic
modules. The integration time and conversion time of the individual modules are
also set by means of this parameter. See the technical specifications of the analog
electronic modules in Chapter 12.
Reference junction slot
See chapter 12.2.2.
Reference junction input
See chapter 12.2.2.
Synchronize DP slave with DP cycle
You can use this parameter to enable or disable clocking.
If you enable clocking, the I/Os of the ET 200S are synchronized with the global
control frame of the master (as an equidistance clocking).
Requirements: See Section 3.7
Time Ti (read in process values)
This value can only be set provided you have enabled the "Synchronize DP slave
with DP cycle" parameter.
Ti is the time reserved for reading in the input data at the ET 200S. At the
beginning of Ti, the input data is converted at the terminals and stored in a buffer
via the backplane bus of the ET 200S. Ti ends at the beginning of the next,
equidistant DP cycle (i.e. with the global control frame).
At this point, the most recent, most up-to-date input data must be available to be
read in on the PROFIBUS subnet. The time Ti must take into account the
processing and delay times in the modules and in the backplane bus of the
ET 200S and, in the case of modular slaves, is therefore dependent on the
configuration.
The time Ti can only be set in the specified increments between the minimum and
maximum values. Normally, the default values should be accepted.
8-6
ET 200S Distributed I/O System
EWA-4NEB 780602402-12