Siemens SIMATIC ET 200S Manual page 426

Analog Electronic Modules
• Smoothing in the case of the 2AI U High Speed, 2AI I 2WIRE High Speed, 2AI I
4WIRE High Speed
None: k=1
1
0.63
0.5
0
Figure 13-6
Interference frequency suppression
The 2AI U High Feature and 2AI I 2/4WIRE High Feature analog input modules
support the interference frequency suppression setting (50 Hz or 60 Hz) for the
interface module. These High Feature analog input modules also allow you to
disable interference frequency suppression, thus ignoring the setting made on the
interface module. If you disable interference frequency suppression, the
conversion and cycle times become faster for these modules.
Run-time calibration
• 2AI U High Feature
Run-time calibration can be enabled at module parameterization for the 2AI U
High Feature analog electronic module to adjust for component drift due to
changes in ambient temperature. During the calibration interval, new data
updates will be delayed for 250 ms. Calibration takes place every time there is a
5° C change in ambient temperature.
• 2AI I 2/4WIRE High Feature
Run-time calibration can be enabled at module parameterization for the 2AI I
2/4WIRE High Feature analog electronic module to periodically adjust for the
offset voltage drift of the A/D converter. During the calibration interval, new data
updates will be delayed for 200 ms. The accuracy limits of the module will be
met without run-time calibration.
13-42
Weak: k=64
100 200
Smoothing in the case of the 2AI U High Speed, 2AI I 2WIRE High Speed, 2AI
I 4WIRE High Speed
Medium: k=128
300 400
Module cycles
ET 200S Distributed I/O System
Strong: k=512
500 600
EWA-4NEB780602402-09