USER HANDBOOK 2.0 | DC20XX, ET20XX, ECC21XX SLIM
Berghof Automation GmbH | Harretstrasse 1 | 72800 Eningen | www.berghof.com
Dialog-Controller-DC20XX_EN.docx
47
Operating modes for the analogue inputs
NOTICE
Damage to channel
High voltages can damage analogue channels, stopping them from working
correctly.
Ensure the input voltage does not exceed ±30 V.
Operating mode: voltage input AI (U)
Feature
Value
Description
Connections per input
–
AI (U/T) and AGND or AI (U) and AGND;
connect screening with AGND.
Measuring range
–10 to +10 V
–
Input impedance in
signal range
100 kΩ
applies between AI (U/T) and AGND or
between AI (U) and AGND
value when the channel is switched on or off
Max. errors at 25 °C
±0.8% (±2°C)
–
Temperature
coefficient
±40 ppm/K
(±0.4 mV/K)
–
Digital resolution
24 bit
–
Data format in
user program
32 bit real
(floating-point number) in millivolts (mV)
Maximum permissible
permanent overload
Max. ±30 V compared
to AGND
±30 V = max. voltage on AI channel
Value of least
significant bit
1.2 µV
–
Output of digital value
in case of overload
–
If a voltage of ±10 V is applied to an AI (U), a
plausible value is still given up to approx. ±15 V.
The specified accuracy is only valid for the range
–10 to +10 V.
When applying voltages above +15 V or below
–15 V, a fault bit (FAULTN/FAULTP) is set in the
process image which can be read by the user
program..
Input type
–
Unsymmetrical voltage metering (single-ended)
Reference potential
AGND
–
Dynamic characteristics
Analogue filtering
Second-grade low-pass
filter; cut-off frequency
650 Hz
–
