Beckhoff EL3742 | EtherCAT Terminal, 2-channel analog input, current

The EL3742 analog input terminal handles signals in the

range between 0 and 20 mA. The voltage is digitized to

a resolution of 16 bits, and is transmitted, electrically

isolated, to the controller. The input channels of the

EtherCAT Terminal have differential inputs and possess

a common, internal ground potential.

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 collected and transferred 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 EL3742

devices to be synchronized in almost any configuration.

The maximum sampling rate per channel is 100 ksamples/s

(100.000 samples/s).