Digital Inputs; Fig. 8-6: Input Circuitry - Addi-Data APCI-3010 Technical Description

APCI-3xxx
8.4

Digital inputs

The inputs are designed for the acquisition of external signal states:
The input information is loaded as numerical value into a memory unit of
the PC by software.
This numeric value calculates the state of the inputs signals.
24 V optically isolated inputs
They correspond to the 24 V industrial standard (IEC1131-2):
logic"1" corresponds to an input voltage superior to 19 V
-
logic"0" corresponds to an input voltage inferior to 14V.
-
The current consumption for each input is 10.5 mA (when nominal voltage).
The max. input voltage is 30 V.
The inputs signals are filtered by TRANSIL diodes, Z diodes, LC filer and
optical couplers. Herewith the impacts of inductive and capacitive incoupled
interferences are reduced.
The board has not to be initialised in order to read directly the digital
information of the inputs. The data can be read right after Power ON.
NOTICE!
The supply unit for the external voltage supply of the
board must supply the power that is needed for your
application.

Fig. 8-6: Input circuitry

Functions of the board
37