Siemens SIMATIC ET 200S Manual page 447

Interference Frequency Suppression
The 2AI U High Feature and 2AI I 2/4WIRE High Feature analog input modules
support the setting of interference frequency suppression (50 Hz or 60 Hz) with the
interface module. These analog input modules (HIGH FEATURE) also allow
blocking of interference frequency suppression; this means that this setting can be
ignored on the interface module. If interference frequency suppression is blocked,
the conversion and cycle times of these modules are improved.
Runtime calibration
• 2AI U High Feature
When configuring the module the runtime calibration can be enabled for the 2AI
U High Feature analog electronic module to compensate for component
changes resulting from changes in the ambient temperature. The update of new
data is delayed by 250 ms during the calibration interval. A calibration is
conducted at every change of 5° C in the ambient temperature.
• 2AI I 2/4WIRE High Feature
When calibrating the module a runtime calibration for the 2AI I 2WIRE High
Feature analog electronic module can be enabled for periodic compensation of
the error voltage change of the A/D converter. The update of new data is
delayed by 200 ms during the calibration interval. The precision limits of the
module are reached without run time calibration.
Reference junction
See chapter 12.2.2.
Reference junction number:
See chapter 12.2.2
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Analog Electronic Modules
12-41