BECKHOFF DK9222-1209-0007 User Manual

Page 4

I/O

Measurement technology

Application Note DK9222-1209-0007

230 V AC, 50 Hz

L1
L2
L3
N
PE

Ethernet TCP/IP

Fipio

Drive

Y-axis

Fig. 3: Integration in any fieldbus environment as Bus Terminal or EtherCAT Terminal

Differences between EL3403 and KL3403

In principle, the EL3403 EtherCAT Terminal has the same range of functions as the KL3403 Bus Terminal, but is optimised for
measurements in the 50/60 Hz mains network. Significant differences are briefly listed here; further information and specific
details on the respective terminals can be taken from the documentation at www.beckhoff.com. EtherCAT Terminals are
integrated via EtherCAT Couplers, Bus Terminals via Bus Couplers.
Unlike the KL3403, the value for reactive power is also calculated internally in the EL3403. The energy consumption is totalled
up per sign, since different tariffs often apply to drawing out and feeding in.
As opposed to the KL3403, the EL3403 offers a considerably higher measurement value resolution. The standard version of the
KL3403 achieves a measurement value resolution of 1 mA, whereas the EL3403 enables a resolution of down to 1 µA. Both
values have a tolerance of 0.5 % FS (see documentation for details and further terminal variants). The EL3403 uses EtherCAT
as the transmission medium with a high data transmission rate, with which it is possible to read out all essential measurement
values in parallel if need be.
The EL3403’s measurement range for frequency measurements is narrower, but considerably more accurate. However, the
KL3403 can also be used for DC measurements. The measurement cycle is also optimised to the 50/60 Hz mains network in the
case of the EL3403: the measurement range automatically snaps to one period of the mains frequency. A multiple of the period

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