Siemens SIMATIC - Settling and Response Times of Analog Output Channels

Principles of analog modules
5.6 Settling and response times of analog output channels
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
293
5.6 Settling and response times of analog output channels
Settling time
The settling time (t
2
to t
3
), i.e. the time expiring until a converted value has gained a specified
level at an analog output, is load-dependent. We therefore distinguish between resistive,
capacitive and inductive load.
For information on settling times as a function of load at the various analog output modules,
refer to the technical data of the relevant module.
Response time
The worst case response time (t
1
to t
3
), i.e. the time expiring between the input of digital
output values to internal memory, and the signal settling time at the analog output, may be
equivalent to the total of cycle time plus settling time.
The worst case scenario is given, when the analog channel has been converted immediately
before a new output value is transferred, and is not converted again until all other channels
have been converted (cycle time.)
Overview of the settling time and response time of analog output modules
t
A
Response time
t
C
tC = Cycle time, equivalent to n x conversion time (n = active channels)
t
S
Settling time
t
1
new digital output value is set
t
2
Output value is applied and converted
t
3
specified output value is reached