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Operating manual ZX09/20/21-Series
5.5.3 Analog inputs (only ZX09A, ZX09B, ZX09C, ZX09D, ZX09E)
The following device variants provide a different number of analog inputs:
The analog inputs are accessible via the terminals A1+ and 0V ... A6+ and 0V.
Via the two switch positions 20mA and 10V on the controller (see Fig. 17), the
switchable analog inputs can be configured as voltage or current inputs. For
configuration, both switches must be moved to the corresponding position. (position
10V for voltage measurement, position 20mA for current measurement). If the
corresponding switches are in different positions when operating an analog input, the
input may be destroyed. The analog inputs enable the detection of a current value
from 0 mA to 20 mA or a voltage value from 0 V to 10 V by means of the
corresponding switch position. The incoming current or voltage signal is connected
to terminal A+ and the respective 0 V potential to 0V.
Note:
In the "Structured Text" the input variable for the analog input can be
declared under "VAR_ADC". Detailed information can be found in the
programming manual under Chapter 2.2.6.3 "VAR_ADC", which is
included as a PDF file in the software package EX_PRESS 5 (Art. No.
589092) on the USB stick included there.
Warning:
When using the analog input as current input, the applied current must not
exceed 38 mA and no voltage source must be applied. Otherwise the
analog input will be destroyed. For further information, please observe the
permissible operating range for the analog inputs and the other
specifications in chapter 12 "Technical Data".
Device version
Description
Number (total)
ZX09A
1 switchable input: 0..10 V or 4..20 mA
1
ZX09B and
ZX09D
4 fixed inputs: 0..10 V
2 switchable inputs: 0..10 V or 4..20 mA
6
ZX09C and
ZX09E
6
4 fixed inputs: 0..20 mA
2 switchable inputs: 0..10 V or 4..20 mA
