Beckhoff ELX3351 | EtherCAT Terminal, 1-channel analog input, measuring bridge

The analog ELX3351 input terminal enables direct connection of a resistor

bridge or load cell from hazardous areas, zone 0/20 and 1/21.

The terminal can be connected in 4- or 6-wire technology. The ratio between

the bridge voltage UD and the supply voltage UREF is determined in 24-bit

resolution, and the load value is calculated as a process value. Apart from

automatic self-calibration (can be deactivated), additional functions such as

Tare and Freeze as well as dynamic filters are integrated. The ELX3351 is

therefore functionally comparable to the EL3356.

EtherCAT terminals of the ELX series must always be operated in conjunction

with the ELX9560 power supply terminal. This terminal generates an electrically

isolated output voltage (24 V EX) from the input voltage (24 V DC) for supplying

the subsequent ELX terminals. If a new power supply is required, the combination

of an ELX9410 and an ELX9560 can be used so that further ELX terminals can be

added.

The ELX terminal segment must be terminated with one ELX9012. two ELX9410

or one EK1110. The use of two ELX9410 allows the use of EL terminals behind

ELX terminals. With the EK1110. the terminal segment can be continued via an

EtherCAT cable, for example to implement cable redundancy.