Electrical Interfaces
AGD155 Product Manual Rev.2.2
Page 40
3.4.16 I/O Interfaces – Circuitry
The section describes the electrical I/O interfaces that are related to external devices. The number of
I/Os available in the product depends on the model number or variant number. Refer to product
catalog or consult your sales channel for more details.
Isolated Digital Inputs 1 to 3, 5 to 9, and 13 to 16
Figure 25. Digital Input 1 to 3, 5 to 9, and 13 to 16 (3 isolated groups)
The interface circuit is identical for all 8 digital inputs, except Digital_Input_4. Refer to the
electrical interface of Digital_Input_4.
Digital_Input_Common are grouped by digital inputs 1 to 3, 5 to 9, and 13 to 16. Digital_Input_4
is not a part of these groups.
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’s
Digital_Input_Common pin. If the Digital_Input_Common pin is connected to power (between 5V
and 24V), then the inputs of this group can be used with external NPN devices (external current
sinking devices). If the Digital_Input_Common is connected to the GND of an external power
supply, then the inputs of this group can be used with external PNP devices (external current
sourcing devices).
The input circuit of the opto-couplers includes two diodes. This enables use as NPN or PNP.
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 (NPN or PNP) must be the same, as
they are based on the connection of the group’s Digital_Input_Common pin.
Isolated Digital Input 4
Figure 26. Digital Input 4
Digital_Input_4 is internally pulled to IO_PWR_Return. It can only be connected as sinking input.
