USER HANDBOOK 1.0 | DC2115, ET2115
Berghof Automation GmbH | Harretstrasse 1 | 72800 Eningen | www.berghof.com
21-0099-82-00-00-003 | 270010900_Anwenderhandbuch_DC-ET2115_EN.docx
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Operating modes for the analogue inputs
NOTE
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 coeffi-
cient
±40 ppm/K
(±0.4 mV/K)
–
Digital resolution
24 bit
–
Data format in the 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 at AI channel
Value of least signifi-
cant 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 plau-
sible value is still given up to approx. ±15 V. The
specified accuracy is only valid for the range –10 to
+10 V.
If the voltages applied are greater than +15 V or
less than –15 V, an error 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
Low-pass second order,
limit frequency 650 Hz
–
