Denso RC5 - Manual (Page 166)

146
6.2.5 I/O Power Connector (PNP type)
For the power source to communicate signals between the robot controller and the
external device, the internal power source of the robot controller or an external power
source is used.
The figure below shows an example of connecting I/O power connectors when the
internal power source is used, and the figure on the next page shows an example of
connecting I/O power connectors when an external power source is used.
I/O Power Connection Sample (When the internal power source is used) (PNP type)
Caution: To use the internal power source of the robot controller, connect
the wiring so that the internal power source will be separate from
the external power source. Improper wiring may damage the
internal circuit.
The
+ + + +
24V internal power source of the robot controller must not
be grounded.