Aerotech XL4s, Hardware Manual

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2.6.1. 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 the same
configuration. Refer to
Figure 2-7 and Figure 2-8 .
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 2-7 . To see
an example of a current sinking output that has diode suppression, refer to Figure 2-8 .
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 2-20: Digital Output Specifications
Digital Output Specifications Value
Maximum Voltage 24 V (26 V Maximum)
Maximum Sink/Source Current 50 mA/output
Output Saturation Voltage 0.2 V at maximum current
Output Resistance 4 Ω
Rise / Fall Time 250 µs (2K pull up to 24V)
Reset State Output Off (High Impedance State)
Table 2-21: Digital Output Pins on the Digital/Analog I/O A Connector
Pin # Label Description In/Out/Bi
1 DO0 Digital Output 0 (Optically-Isolated) Output
2 DO1 Digital Output 1 (Optically-Isolated) Output
3 DO2 Digital Output 2 (Optically-Isolated) Output
4 DO3 Digital Output 3 (Optically-Isolated) Output
5 DOC Digital Output Common Output
2.6.1. Digital Outputs XL4s Hardware Manual
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