Impulse 520W - Manual (Page 73)

Digital I/O Wiring Connections
The SeaI/O-470 modules include eight optically isolated inputs that are arranged such
that each group of four inputs shares a single common. The four I/O points and
shared common are connected via a five-position removable screw terminal.
The SeaI/O-470 modules provide eight open-collector digital outputs. The outputs
do not source any current and must be connected to an external power source, max
30VDC. The outputs act as a switch and the circuit is open until energized. When
the output circuit is energized in software, the output sinks the current to ground,
closing the circuit.
© Sealevel Systems, Inc. - 70 - SeaI/O User Manual