Digital Inputs

Input bits are arranged in groups of 4 and each group shares a common pin. This lets a group be connected to current sourcing or current sinking devices, based on the connection of the common pin in that group.

To be able to connect an input group to current sourcing devices, connect the input group's common pin to the power supply return (-). Refer to Digital Inputs Connected to Current Sourcing (PNP) Devices.

To be able to connect an input group to current sinking devices, connect the input group's common pin to the power supply source (+). Refer to Digital Inputs Connected to Current Sinking (NPN) Devices.

The digital inputs are not designed for high-voltage isolation applications. They should only be used with ground-referenced circuits.

Table: Digital Input Specifications

Input Voltage

Approximate Input Current

Turn On Time

Turn Off Time

+5 V to +24 V

6 mA

10 µs

43 µs

Table: Digital Input Pins on the Digital I/O Connector

Pin #

Description

In/Out/Bi
19 Input Common for Digital Inputs 0-3 Output

6

 Opto-Isolated Digital Input 0 / Home Limit Axis 1 Input
20 Opto-Isolated Digital Input 1 / Home Limit Axis 2 Input

7

 Opto-Isolated Digital Input 2 / Home Limit Axis 3 Input
21 Opto-Isolated Digital Input 3 / Home Limit Axis 4 Input

8

 Input Common for Digital Inputs 4-7 Output
22 Opto-Isolated Digital Input 4 Input
9 Opto-Isolated Digital Input 5 Input
23 Opto-Isolated Digital Input 6 Input
10 Opto-Isolated Digital Input 7 Input

Figure: Digital Inputs Schematic

Each group of four inputs must be connected in an all sourcing or all sinking configuration.

Figure: Digital Inputs Connected to Current Sourcing (PNP) Devices

 

Figure: Digital Inputs Connected to Current Sinking (NPN) Devices