Beckhoff EPP3752-0000, Документация

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Mounting and cabling
EPP3752-0000 15 Version: 1.2
4.2 EtherCAT P
WARNING
Power supply from SELV/PELV power supply unit!
SELV/PELV circuits (Safety Extra Low Voltage, Protective Extra Low Voltage) according to
IEC 61010-2-201 must be used to supply the EtherCAT P Power Sourcing Device (PSD).
Notes:
• SELV/PELV circuits may give rise to further requirements from standards such as IEC 60204-1 et al, for
example with regard to cable spacing and insulation.
• A SELV (Safety Extra Low Voltage) supply provides safe electrical isolation and limitation of the voltage
without a connection to the protective conductor,
a PELV (Protective Extra Low Voltage) supply also requires a safe connection to the protective conduc-
tor.
CAUTION
Observe the UL requirements
• When operating under UL conditions, observe the warnings in the chapter UL Requirements [ } 19] .
EtherCAT P transmits two supply voltages:
• Control voltage U
S
The following sub-functions are supplied from the control voltage U
S
:
◦ the fieldbus
◦ the processor logic
◦ typically the inputs and the sensors if the EtherCAT P Box has inputs.
• Peripheral voltage U
P
The digital outputs are typically supplied from the peripheral voltage U
P
for EtherCAT P Box modules
with digital outputs. U
P
can be supplied separately. If U
P
is switched off, the fieldbus function, the
function of the inputs and the supply of the sensors are maintained.
The exact assignment of U
S
and U
P
can be found in the pin assignment of the I/O connections.
Redirection of the supply voltages
The supply voltages are passed on internally from the "IN" connection to the "OUT" connection. Hence, the
supply voltages U
S
and U
P
can be passed from one EtherCAT P Box to the next EtherCAT P Box in a simple
manner.
NOTE
Note the maximum current.
Ensure that the maximum permitted current of 3 A for the M8 connectors is not exceeded when redirecting
EtherCAT P.