ArmorBlock MaXum I/O Cable Bases DeviceNet Powered Outputs Series B
3
Publication 1792D-IN001B-EN-P - September 2000
Powering Outputs Using DeviceNet Power
You can power some output devices from the DeviceNet network.
The application must allow the voltage to remain within the
DeviceNet specification limits of 11-25V dc. Most actuators need to be
powered by a separate power supply. They usually require more
power than is practically available from DeviceNet. Also, the large
voltage variation of 11-25V that DeviceNet allows is typically beyond
the range over which most available actuators or output devices can
safely operate.
You can use DeviceNet power to operate output devices such as
hydraulic and pneumatic solenoid valves, pilot and stack lights, and
motor starter coils with the following caution:
ATTENTION
!
Do not let DeviceNet voltage at the relevant
node exceed the output device’s acceptable
voltage range. Output devices rated 24V dc
rarely are specified to operate below 19.2V dc or
-20% of their 24V dc rating. Many only operate
down to 20.4V dc or -15% of the rated voltage.
This means that the DeviceNet network design
must not let the available voltage drop below
19.2 volts, for example, instead of the 11 volts
that the DeviceNet specification allows. This
higher lower voltage limit, which is within the
DeviceNet specification, will actually restrict the
distance of the DeviceNet network from what
would be possible if actuators were not utilizing
the DeviceNet power.
IMPORTANT
Design your network so that sufficient voltage is
available to operate the output device wherever it
is installed. This is especially important when it is
connected at the farthest location from the power
supply.