File name:
Central-I - Hardware Manual -IO Board CiG1-IOC01-
0A-01-00 V1.1.docx
Date:
Monday, Nov11, 2016
Version:
1.1
Author:
Akribis
Pages:
27
Central-I - Hardware Manual -IO Board CiG1-IOC01-0A-01-00 V1.1.docx
Page 13
Electrical interfaces
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Discrete, Isolated, inputs:
Figure 2 Isolated Inputs circuit diagram
▪
The interface circuit is identical for inputs 1 to 4, which are organized as a single group.
▪
Similarly, in port J4, inputs 5-8 are organized as a group with an identical interface
circuits, in port J5, inputs 9-12 are a third independent group, and in port J8, inputs 13-
16 are the forth independent group.
▪
Each group is fully isolated and independent of the other groups.
▪
Each group can be connected as NPN or PNP interfaces, depending on the wiring of the
group common pin. If the common pin is connected to power (5v to 28v), then the
inputs of this group can be used with external NPN devices (external current sinking
devices). If the common is connected to the GND of some external power, then the
inputs can be used with external PNP devices (external current sourcing devices).
▪
Note that the input circuit of the opto couplers includes two diodes. This enables the
usage as NPN of PNP.
▪
Clearly, one group can be wired to interface external NPN devices and another group
can be wired to interface PNP devices. However, within a group, all interfaces should
be the same, as they are based on the connection of the group common pin
