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Beckhoff Automation Pte. Ltd.

#05-07/08 Nordic European Centre
3 International Business Park
Singapore 609927, Singapore

+65 6697 6220
info@beckhoff.com.sg
www.beckhoff.com/zh-sg/

KL3351 | Bus Terminal, 1-channel analog input, measuring bridge, full bridge, 16 bit

KL3351 | Bus Terminal, 1-channel analog input, measuring bridge, full bridge, 16 bit

KL3351 | Bus Terminal, 1-channel analog input, measuring bridge, full bridge, 16 bit

Run LED 1
Error LED 1
Run LED 2
Error LED 2
+UD
-UD
-Uv = 0 V
Shield
+UREF
-UREF
+Uv = 5 V
Shield
Top view 
Contact assembly 
The supply voltage Uv can be
drawn from the terminal or
can be supplied from an
external source. The terminal
supplies 5 V. The maximum
input voltage UREF is limited
to 10 V.
KL3351 | Bus Terminal, 1-channel analog input, measuring bridge, full bridge, 16 bit

KL3351 | Bus Terminal, 1-channel analog input, measuring bridge, full bridge, 16 bit

Precise strain measurement in the I/O system

Precise strain measurement in the I/O system

The KL3351 analog input terminal permits direct connection of a resistor bridge. The bridge voltage, UD, and the supply voltage, UREF, to the bridge are digitized with a 16 bit resolution, and are transmitted along an electrically isolated channel to the supervising automation system. The input channels are available in the form of two 16 bit values for further processing. The resulting measurement can be calculated from the formula: measurement = UD/UREF. Precise acquisition of the supply voltage along with the bridge voltage compensates for long-term and temperature drift.

Product status:

regular delivery

Product information

Technical dataKL3351
Number of inputs2, for 1 resistor bridge
Power supplyvia the K-bus
Signal voltage UD-16…+16 mV, configurable
Signal voltage UREF±10 V
Technologystrain gauge connection
Internal resistance> 200 kΩ (UREF), > 1 MΩ (UD)
Power supply UV5 V DC, max. 20 mA
Conversion time< 250 ms, configurable
Filter50 Hz, configurable
Resolution16 bit
Measurement error/ uncertainty< ±0.1% (relative to full scale value)
Current consumption power contacts– (no power contacts)
Current consumption K-bustyp. 65 mA
Bit width in the process imageinput: 2 x 16 bit data (2 x 8 bit control/status optional)
Special featureswith internal bridge supply
Weightapprox. 70 g
Operating/storage temperature0…+55°C/-25…+85°C
Relative humidity95%, no condensation
Vibration/shock resistanceconforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emissionconforms to EN 61000-6-2/EN 61000-6-4
Protect. rating/installation pos.IP20/variable
Approvals/markingsCE, UL, ATEX, IECEx
Pluggable wiringfor all KSxxxx Bus Terminals
Ex markingATEX:
II 3 G Ex ec IIC T4 Gc
IECEx:
Ex ec IIC T4 Gc
Housing dataKL-12-8pinKS-12-8pin
Design formcompact terminal housing with signal LEDsterminal housing with pluggable wiring level
Materialpolycarbonate
Dimensions (W x H x D)12 mm x 100 mm x 68 mm
Installationon 35 mm DIN rail, conforming to EN 60715 with lock
Side by side mounting by means ofdouble slot and key connection
Markinglabeling of the BZxxx series
Wiringsolid conductor (s), flexible conductor (st) and ferrule (f): spring actuation by screwdriver
Connection cross-sections*: 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 AWGs*: AWG28…14,
st*: AWG28…14,
f*: AWG26…16
s*: AWG28…16,
st*: AWG28…16,
f*: AWG26…16
Stripping length8…9 mm9…10 mm
Current load power contactsImax: 10 A

*s: solid wire; st: stranded wire; f: with ferrule

Ordering information
KL3351Bus Terminal, 1-channel analog input, measuring bridge, full bridge, 16 bit
KS3351Bus Terminal, 1-channel analog input, measuring bridge, full bridge, 16 bit, pluggable wiring
KL3351-0001Bus Terminal, 1-channel analog input, measuring bridge, full bridge, 16 bit, with faster measurement time approx. 10 ms

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