Meilhaus Electronic ME-630 Series, Manual

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 The opto-isolated inputs and outputs achieve an electrical
isolation of the application relative to PC ground.
 Note that the computer must be powered up prior to
connecting signals by the external wiring of the board.
 As a basic principle, all connections to the board should only be
made or removed in a powered-down state of all components.
 Ensure that no static discharge occurs while handling the
board or while connecting/disconnecting the external cable.
 Ensure that the connection cable is properly connected. It
must be seated firmly on the D-Sub connector and must be
tightened with both screws, otherwise proper operation of the
board cannot be guaranteed.
1.1.2 Improper Application
PC plug-in boards for the PCI-, PCI-Express- or CompactPCI-bus
may not be taken into operation outside of the PC. Never connect
the devices with voltage-carrying parts, especially not with mains
voltage.
Make sure that no contact with voltage-carrying parts can happen
by the external wiring of the device. As a basic principle, all
connections should only be made or removed in a powered-down
state.
1.1.3 Unforeseeable Misapplications
The device is not suitable to be used as a children’s toy, in the
household or under unfavourable environmental conditions (e.g. in
the open). Appropriate precautions to avoid any unforeseeable
misapplication must be taken by the user.