Universal Robots UR3/CB3 User Manual page 44

It is possible to power the digital I/O from an internal 24V power supply or from an
external power source by configuring the terminal block called "Power". This block
consists of four terminals. The upper two (PWR and GND) are 24V and ground from
the internal 24V supply. The lower two terminals (24V and 0V) in the block are the 24V
input to supply the I/O. The default configuration is to use the internal power supply,
see below.
If more current is needed, an external power supply can be connected as shown below.
The electrical specifications for both the internal and an external power supply are
shown below.
The digital I/O are constructed in compliance with IEC 61131-2. The electrical specifi-
cations are shown below.
UR3/CB3
Terminals
Internal 24V power supply
[PWR - GND]
[PWR - GND]
External 24V input requirements
[24V - 0V]
[24V - 0V]
I-32
Power
PWR
GND
24V
0V
Power
PWR
GND
24V
0V
Parameter Min Typ
Voltage 23 24
Current 0 -
Voltage 20 24
Current 0 -
5.3 Controller I/O
Max Unit
25 V
2 A
29 V
6 A
Version 3.3.3