Power supply for the EtherCAT plug-in modules
WARNINGA SELV/PELV power supply must be used to supply power for the EJ coupler and modules. Couplers and modules have to be connected to SELV/PELV circuits exclusively.
The signal distribution board should have a power supply designed for the maximum possible current load of the module string. Information on the current required from the E-bus supply can be found for each module in the respective documentation in section “Technical data”, online and in the catalog. The power requirement of the module string is displayed in the TwinCAT System Manager.
E-bus power supply with EJ1100 or EJ1101-0022 and EJ940x
The EJ1100 Bus Coupler supplies the connected EJ modules with the E-bus system voltage of 3.3 V. The Coupler can accommodate a load up to 2.2 A. If a higher current is required, a combination of the coupler EJ1101-0022 and the power supply units EJ9400 (2.5 A) or EJ9404 (12 A) should be used. The EJ940x power supply units can be used as additional supply modules in the module string.
Depending on the application, the following combinations for the E-bus supply are available:
In the EJ1101-0022 coupler, the RJ45 connectors and optional ID switches are external and can be positioned anywhere on the signal distribution board, as required. This facilitates feeding through a housing.
The EJ940x power supply plug-in modules provide an optional reset function (see chapter Connection of the documentation for EJ9400 and EJ9404)
E-bus power supply with CXxxxx and EK1110-004x
The Embedded PC supplies the attached EtherCAT terminals and the EtherCAT EJ coupler
- with a supply voltage Us of 24 VDC (-15 %/+20%). This voltage supplies the E-bus and the bus terminal electronics.
The CXxxxx units supply the E-bus with up to 2,000 mA E-bus current. If a higher current is required due to the attached terminals, power feed terminals or power supply plug-in modules must be used for the E-bus supply. - with a peripheral voltage Up of 24 VDC to supply the field electronics.
The EK1110-004x EtherCAT EJ couplers relay the following parameters to the signal distribution board via the rear connector:
- the E-bus signals,
- the E-bus voltage UEBUS (3.3 V) and
- the peripheral voltage UP (24 VDC).
