Siemens SIMATIC ET 200eco PN - Page 260

Response times for analog input device and output device
F.2 Response times for analog output device
ET 200eco PN
260 Operating Instructions, 08/2016, A5E01250250-AJ
Response time
The response time (t
1
to t
3
)—that is, the time from the application of the digital output values
in internal memory until the specified value is reached at the analog output—is, in the most
unfavorable case, the sum of the cycle time and the settling time. The worst case scenario is
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).
This figure shows the response time of an analog output channel:
t
A
Response time
t
Z
Cycle time, corresponding to the processing time of the device and the conversion time of the
channel
t
E
Settling time
t
1
New digital output value applied
t
2
Output value transferred and converted
t
3
Specified output value obtained
Figure F-3 Response time of an analog output channel