1-channel accurate resistance bridge evaluation

With self-calibration

16 bit

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The KL3356 analog input terminal permits direct connection of a resistor bridge. An improved input circuit makes the KL3356 significantly more accurate than the KL3351. The ratio between the bridge voltage UD and the supply voltage UREF is determined in the input circuit. In order to achieve good long-term stability, the complete circuit is re-calibrated at least every three minutes. This procedure can be synchronized by the control in order to prevent the calibration leading to a delay in the production process.


Technical data KL3356, KS3356
Number of inputs 2, for 1 resistor bridge
Power supply via the K-bus
Signal voltage UD: -20…+20 mV
UREF: -12…+12 V
Signal voltage UD, UREF -20…+20 mV, -12…+12 V
Technology strain gauge connection
Internal resistance > 200 kΩ (UREF), > 1 MΩ (UD)
Power supply UV via power contacts
Conversion time < 250 ms, configurable
Filter 50 Hz, configurable
Resolution 16 bit
Measuring error < ±0.01 % (relative to full scale value)
Current consumption power contacts load only
Current consumption K-bus typ. 85 mA
Bit width in the process image input: 2 x 16 bit data (2 x 8 bit control/status optional)
Special features increased measuring accuracy, self-calibration
Weight approx. 75 g
Operating/storage temperature 0…+55 °C/-25…+85 °C
Relative humidity 95 %, no condensation
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. rating/installation pos. IP20/variable
Pluggable wiring for all KSxxxx Bus Terminals
Approvals/markings CE, UL, ATEX
Ex marking II 3 G Ex nA IIC T4 Gc


Housing data KL-12-8pin KS-12-8pin
Design form compact terminal housing with signal LEDs terminal housing with pluggable wiring level
Material polycarbonate
Dimensions (W x H x D) 12 mm x 100 mm x 68 mm
Installation on 35 mm DIN rail, conforming to EN 60715 with lock
Side by side mounting by means of double slot and key connection
Marking labeling of the BZxxx series
Wiring solid conductor (e), flexible conductor (f) and ferrule (a): spring actuation by screwdriver
Connection cross-section s*: 0.08…2.5 mm²,
st*: 0.08…2.5 mm²,
f*: 0.14…1.5 mm²
s*: 0.08…1.5 mm²,
st*: 0.08…1.5 mm²,
f*: 0.14…1.5 mm²
Connection cross-section AWG s*: AWG 28…14,
st*: AWG 28…14,
f*: AWG 26…16
s*: AWG 28…16,
st*: AWG 28…16,
f*: AWG 26…16
Stripping length 8…9 mm 9…10 mm
Current load power contacts Imax: 10 A


Data Sheet: kl3356


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