Beckhoff ELX3351-0090 | EtherCAT Terminal, 1-channel analog input, measuring bridge

The analog ELX3351-0090 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 UR is determined in 16-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.

With the aid of the TwinSAFE SC technology (TwinSAFE Single Channel) it is

possible to make use of standard signals for safety tasks in any network or

fieldbus. To do this, EtherCAT I/Os from the areas of analog input, position

measurement or communication (4…20 mA, incremental encoder, IO-Link,

etc.) are extended by the TwinSAFE SC function. The properties typical for

the signals and the standard functions of the I/O components are retained.

TwinSAFE SC I/Os differ optically from standard I/Os by a yellow stripe on

the front of the housing.

The TwinSAFE SC technology enables communication via a TwinSAFE protocol.

These connections can be distinguished from the usual secure communication

via Safety over EtherCAT.

The data from the TwinSAFE SC components is fed via a TwinSAFE protocol

to the TwinSAFE Logic, where it can be used in the context of safety-relevant

applications. Detailed examples confirmed/calculated by the TÜV SÜD for the

correct application of the TwinSAFE SC components and the respective

normative classifications can be found in the TwinSAFE application manual.