Positioning Of Passive Terminals; Power Supply, Potential Groups; Fig. 26 Correct Positioning; Fig. 27 Incorrect Positioning - Beckhoff EK18 Series Documentation

Mounting and wiring
5.4

Positioning of passive Terminals

Hint for positioning of passive terminals in the bus terminal block
EtherCAT Terminals (ELxxxx / ESxxxx), which do not take an active part in data transfer within the
bus terminal block are so called passive terminals. The passive terminals have no current consump-
tion out of the E-Bus.
To ensure an optimal data transfer, you must not directly string together more than 2 passive termi-
nals!
Examples for positioning of passive terminals (highlighted)
Fig. 26: Correct positioning
Fig. 27: Incorrect positioning
5.5

Power supply, potential groups

Bus Coupler power supply
The Bus Couplers require a 24 V
spring-loaded terminals labelled 24 V and 0 V. The supply voltage is used by the Bus Coupler electronics
and for direct voltage generation for the E-bus. The voltage generation for the E-bus takes place in a DC/DC
converter without electrical isolation.
34
supply for their operation. The connection is made by means of the upper
DC
Version: 2.2 EK18xx