BECKHOFF DK9222-1209-0007 - Manual (Page 3)

I/O
Measurement technology
Application Note DK9222-1209-0007
u i
t
a)
u
1
t
b)
t
c)
u
1
u
1
Measurement
interval 2T
i
i
i
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ϕ
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P
S
P
Fig. 2: Left: typical current-voltage curve, right: types of current that can be measured
The following types of current can be measured with the KL3403: current and voltage curve for phase control (a), pulse
duration control (b) and burst firing control (c); the measurement interval is set analogous to the control interval.
Integration of the KL3403 Bus Terminal
Internal pre-processing of the KL3403 provides rms values in the process image, without requiring high computing capacity
on the controller. The terminal outputs the measurement data in a 3 x 3-byte block, i.e. three bytes for each phase. Two bytes
per phase are pure process data, while one byte transmits the different status bits. The measured total energy performance is
written to the terminal’s internal non-volatile memory in a 15-minute cycle, so that these data are also available after a loss of
power. The recorded measurement values are transmitted to the controller via an arbitrary fieldbus (integration of the terminal
via bus coupler) and are available to the higher-level control system (BDE, ERP or the like) for continuous energy monitoring. In
order to achieve fast, cost-optimised and reliable communication of the energy data, the terminal can be integrated in existing
network architectures via different bus couplers.
New Automation Technology Beckhoff 3
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