II - DCE FEL ČVUT v Praze

I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
Conversion time channel 1
Conversion time channel 2
Conversion time channel n
Fig. 3-14 Cycle time of an analog input module
Cycle time
3.6.2 Conversion, Cycle, Transient Recovery and Response Times of
Analog Output Channels
Introduction
Conversion time
Cycle time
Transient recovery
time
SIMATIC S7 Ex Analog Modules
The definition and interrelationships of relevant times for analog output
modules are described in this section.
The conversion time of analog output channels includes the transfer of
digitized output values and digital/analog conversion.
In the SM 332; AO 4 x 0/4...20 mA, conversion of the analog output
channels takes place in parallel, i.e. on receipt of the data, all four analog
output channels are converted simultaneously.
The cycle time, i.e. the time required until an analog output value is
re-converted, is constant and equals the conversion time.
The transient recovery time (t2 to t3), i.e. the time from applying the
converted value up to achieving the specified value at the analog output is
dependent on load. A differentiation is made between resistive, capacitive
and inductive load.
3-39