Beckhoff KL3356, Документация

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Product overview
KL3356 10 Version: 2.3.0
2.2 Technical data
Technical data KL3356/KS3356
Inputs 2, for one resistor bridge
Signal voltage U
D
-20 mV ... +20 mV
Input resistance (U
D
) >1 MΩ
Supply voltage for the measuring bridge (U
V
) 5 V ... 12 V (recommended)
Reference voltage U
Ref
max. 12 V
Input resistance (U
ref
) > 200 kΩ
Resolution 16 bits
Conversion time < 250 ms, configurable
Measuring error (total measuring range) ±0.01% of the full scale value, self-calibration
Bit width in the K-bus I/O 2 x 16 bit user data, 2 x 8 bit control/status
Bit width in the input process image 2 data words, 2 status byte
Bit width in the output process image 2 data words, 2 control byte
Power supply for the electronics via the K-bus
Current consumption from K-bus typically 85 mA
Weight approx. 75 g
Dimensions (W x H x D) approx. 15 mm x 100mm x 70mm
Mounting [
}
16]
on 35 mm mounting rail conforms to EN 60715
Pluggable wiring [ } 19]
at all KSxxxx series terminals
Permissible ambient temperature range during
operation 0 °C ... + 55 °C
Permissible ambient temperature range during
storage -25 °C ... + 85 °C
Permissible relative air humidity 95 %, no condensation
Vibration / shock resistance conforms to EN 60068-2-6/EN 60068-2-27, see also
Installation instructions [ } 18] for enhanced mechanical
load capacity
EMC immunity/emission conforms to EN 61000-6-2 / EN 61000-6-4
Protection class IP20
Installation position variable
Approval
CE, cULus, ATEX [
}
25]
2.3 Basic function principles
The KL3356 Analog Input Terminal is used to acquire the supply voltage to a load cell as a reference
voltage, and simultaneously the differential voltage that is proportional to the force acting on the cell. The
reference and the differential voltages are measured alternately by the same converter. The quotient of the
differential and the reference voltages corresponds to the force that is acting on the load cell. Deviations in
the analog input stages (temperature drift, long-term drift etc.) are checked by regular calibration, and
compensated to bring the measurement within the permitted tolerance range.
Strain gauge measuring signal
The strain gauge measuring signal is acquired at fixed intervals with a resolution of 16 bits (+ sign). This
value is saved as a data word, without sign, in register
R2 [
}
44] . The sign is represented in bit SW.0 [
}
44]
of the status word.
The length of the sampling interval is directly determined by the filter constant in register
R37 [
}
48] .