Beckhoff EL3702 | EtherCAT Terminal, 2-channel analog input, voltage

The EL3702 analog input terminal handles signals in the

range between -10 and +10 V. The voltage is digitized to

a resolution of 16 bits, and is transmitted, electrically

isolated, to the controller.

The signals are oversampled with an adjustable, integer

multiple (oversampling factor: n) of the bus cycle frequency

(n microcycles per bus cycle). For each bus cycle, the

EtherCAT Terminal generates a process data block that is

transferred collectively during the next bus cycle.

The time base of the terminal can be synchronized precisely

with other EtherCAT devices via distributed clocks. 

This procedure enables the temporal resolution of the analog

input signals to be increased to n times the bus cycle time.

In conjunction with the EL47xx (analog output terminal with

oversampling), responses with equidistant time intervals, e.g.

in the event of a threshold value being exceeded, become

possible.

The distributed clocks function enables several EL3702 devices

to be synchronized in almost any configuration. The maximum

sampling rate per channel is 100 ksamples/s (100.000 samples/s).