Advantech Automation1 XC4, Hardware Manual

Page: 90 / 120

3.1. Digital Outputs [-EB1]
Optically-isolated solid-state relays drive the digital outputs. You can connect the digital outputs in
current sourcing or current sinking mode but you must connect all four outputs in a port in the same
configuration. Refer to
Figure 3-3 and Figure 3-4 .
The digital outputs are not designed for high-voltage isolation applications and they should only be used
with ground-referenced circuits.
You must install suppression diodes on digital outputs that drive relays or other inductive devices. To see
an example of a current sourcing output that has diode suppression, refer to
Figure 3-3 . To see an
example of a current sinking output that has diode suppression, refer to Figure 3-4
The digital outputs have overload protection. They will resume normal operation when the overload is
removed.
Table 3-1: Digital Output Specifications [-EB1]
Digital Output Specifications Value
Maximum Voltage 24 V (26 V Maximum)
Maximum Sink/Source Current 250 mA/output
Output Saturation Voltage 0.9 V at maximum current
Output Resistance 3.7 Ω
Rise / Fall Time 250 µs (2K pull up to 24V)
Reset State Output Off (High Impedance State)
3.1. Digital Outputs [-EB1] XC4 Hardware Manual
90 www.aerotech.com