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KL6781 | Bus Terminal, 1-channel communication interface, M-Bus, master

KL6781 | Bus Terminal, 1-channel communication interface, M-Bus, master

KL6781 | Bus Terminal, 1-channel communication interface, M-Bus, master

Run LED
Send LED
Error LED
Receive LED
Power contact
+24 V
Power contact 0 V
M-Bus+
M-Bus-
Shield
M-Bus+
M-Bus-
Shield
Top view 
Contact assembly 
KL6781 | Bus Terminal, 1-channel communication interface, M-Bus, master

KL6781 | Bus Terminal, 1-channel communication interface, M-Bus, master

The KL6781 M-Bus master terminal enables the direct connection of M-Bus devices. The M-Bus (Meter Bus) is a fieldbus for the acquisition of consumption data from electricity, water, gas or energy meters. The KL6781 does not contain the M-Bus protocol; instead, it converts the data present on the terminal bus into M-Bus compliant physics. 24 byte data are available on the K-bus for this. In conjunction with the TwinCAT M-Bus library, it is possible to work without an external M-Bus gateway, i.e. the M-Bus devices can be connected directly to the KL6781. With a total cable length of 300 m, up to 40 M-Bus devices, so called standard loads, each with a current consumption of 1.5 mA can be connected.

Product status:

regular delivery

Product information

Technical dataKL6781
TechnologyM-Bus
Data transfer standardM-Bus physics
Data transfer channels1
M-Bus devicesmax. 40 standard loads, each with a current consumption of 1.5 mA
Data transfer rates300…9600 baud (default 2400 baud)
Bus accessmaster-slave mode (polling)
Cable lengthmax. 300 m
Current consumption K-bustyp. 65 mA
Current consumption power contactsmax. 250 mA
Short-circuit proofyes
Electrical isolation500 V (K-bus/M-Bus)
Bit width in the process imageinput/output: 24 bytes
ConfigurationTwinCAT (M-Bus function blocks)
Nominal voltage24 V DC (-10 %/+8 %)
Input voltage24 V DC (-10 %/+8 %)
Special featuresTwinCAT library: TwinCAT PLC M-Bus
Weightapprox. 60 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/see documentation
Approvals/markingsCE, UL
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 (e), flexible conductor (f) and ferrule (a): 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*: AWG 28…14,
st*: AWG 28…14,
f*: AWG 26…16
s*: AWG 28…16,
st*: AWG 28…16,
f*: AWG 26…16
Stripping length8…9 mm9…10 mm
Current load power contactsImax: 10 A

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

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