Beckhoff ELX3351, Operating Manual

Page: 25 / 71

Mounting and wiring
ELX3351 25 Version: 1.3.1
Wiring the bridge
Fig. 18: ELX3351 - Connection of a full bridge in 6-wire technology
The ELX3351 is standardly designed for a sensor connection in 6-wire technology.
In the event that a sensor is to be operated in 4-wire technology, the coU
V
and +U
R
as well as the
contacts -U
V
and -U
R
are to be bridged manually, a software-side switching within the terminal is not
possible.
The terminal supplies 10 V
DC
bridge supply voltage U
V
in not loaded state. This voltage is still limited to U
O
in
accordance with the Technical Data for Explosion Protection [
}
13] .
The maximum measuring input voltage U
REF
is limited to 12 V
DC
, the input measuring voltage is limited to
18 mV
DC
.
LED Display
LED Color Meaning
Run green These LED indicates the terminal's operating state:
off State of the EtherCAT State Machine: INIT = initialization of the terminal
flashing State of the EtherCAT State Machine: PREOP = function for mailbox
communication and different standard-settings set
single
flash State of the EtherCAT State Machine: SAFEOP = verification of the Sync
Manager channels and the distributed clocks.
Outputs remain in safe state
on State of the EtherCAT State Machine: OP = normal operating state;
mailbox and process data communication is possible
flickering State of the EtherCAT State Machine: BOOTSTRAP = function for
firmware updates of the terminal
Error red on There is a fault (eg. undershooting or exceeding the measured value
range)
Note: Wire break detection is only for the +Uv and -Uv connections
Measuring green on The terminal is in normal operating mode (measurement)
Self calibration green on Self-calibration in operation