2.3.1. 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 a group in the
same configuration. Refer to
and
.
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
. To see
an example of a current sinking output that has diode suppression, refer to
The digital outputs have overload protection. They will resume normal operation when the overload
is removed.
Table 2-24:
Digital Output Specifications
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)
Table 2-25:
Digital Output Pins on Digital I/O Connector
Pin #
Description
In/Out/Bi
14
Output Common for Digital Outputs 0-3
Output
1
Opto-Isolated Digital Output 0
Output
15
Opto-Isolated Digital Output 1
Output
2
Opto-Isolated Digital Output 2
Output
16
Opto-Isolated Digital Output 3
Output
3
Output Common for Digital Outputs 4-7
Output
17
Opto-Isolated Digital Output 4
Output
4
Opto-Isolated Digital Output 5
Output
18
Opto-Isolated Digital Output 6
Output
5
Opto-Isolated Digital Output 7
Output
iXI4/XI4 Hardware Manual
2.3.1. Digital Outputs
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