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2.5. Auxiliary I/O Connector
2.5.3. Digital Outputs
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 the same
configuration. Refer to
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
example of a current sinking output that has diode suppression, refer to
The digital outputs are not designed for high-voltage isolation applications and they should only be used
with ground-referenced circuits.
The digital outputs have overload protection. They will resume normal operation when the overload is
removed.
Table 2-39:
Digital Output Specifications
Digital Output Specifications
Maximum Voltage
Maximum Sink/Source Current
Output Saturation Voltage
Output Resistance
Rise / Fall Time
Reset State
Table 2-40:
Digital Output Pins on the Auxiliary I/O Connector
Pin#
Description
7
Digital Output 0
8
Digital Output 1
9
Digital Output 2
15
Digital Output Common
16
Digital Output 3
72
Figure 2-38
and
Figure
2-39.
Figure
Figure 2-39
Value
24 V (26 V Maximum)
250 mA/output
0.9 V at maximum current
3.7 Ω
250 µs (2K pull up to 24V)
Output Off (High Impedance State)
XC4 Hardware Manual
2-38. To see an
In/Out/Bi
Output
Output
Output
N/A
Output
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