Response Times
D-7
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
D.6 Response times for analog output modules
Conversion time
The conversion time of the analog output channels comprises the time for the
transfer of the digitized output values from internal memory and the digital/analog
conversion.
Cycle time
The conversion of the analog output channels for the module takes place with a
processing time and sequentially with a conversion time for channels 0 and 1.
The cycle time, that is, the time until an analog output value is converted again, is
the sum of the conversion times of all the activated analog output channels and of
the processing time of the analog output module.
Fig. D-6 provides an overview of how the cycle time for an analog output module is
made up.
Channel 0 conversion time
Channel 1 conversion time
Cycle time
Module processing time
Figure D-6 Cycle time of the analog output module
Settling time
Thesettlingtime(t
2
to t
3
) -- that is, the time from the application of the converted
value until the specified value is obtained at the analog output -- depends on the
load. A distinction must be drawn between resistive, capacitive, and inductive
loads.
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