SMI master terminal, 230 V AC KL6841
Input LED2
Receive LED
Error LED
Input LED1 
+24 V Power LED 
Send LED 
Run LED 
+24 V
Input 1
SMI +
SMI -
0 V
Input 2
SMI +
SMI -
Top view 
Contact assembly 
extended shock and vibration range

KL6841 | SMI master terminal, 230 V AC

The KL6841 master terminal connects the Bus Terminal system with the SMI bus system. SMI (Standard Motor Interface) is used for controlling and exact positioning of roller shutter and sun protection device drives. In conjunction with intelligent energy and lighting management the blades can be positioned and moved according to the sun's position. Up to 16 drives can be connected via an SMI master terminal. The KL6841 is used for interfacing of 230 V AC SMI devices.

Technical data KL6841
Technology SMI
Number of channels 1
Number of slaves 16
Data transfer standard SMI
Data transfer rates 2400 baud
Topology line topology
Cable length max. 200 m
Current consumption K-bus typ. 55 mA
Electrical isolation 500 V (K-bus/SMI-bus)
Bit width in the process image input/output: 24 bytes
Configuration via the Bus Coupler or the controller
Input voltage 24 V DC (-15 %/+20 %)
Insulation voltage SMI bus/K-bus: permanently 1,500 V AC,
SMI bus/24 V DC power supply: permanently 1,500 V AC,
K-bus/24 V DC power supply: permanently 500 V AC
SMI system 230 V AC
Special features 2 digital inputs for simplified commissioning, TwinCAT library: TwinCAT PLC SMI, only for Beckhoff controllers
Weight approx. 80 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. class/installation pos. IP 20/variable
Approvals CE
Accessories  
TwinCAT PLC SMI The library is installed free of charge together with TwinCAT from V2.11 Build 2240 (R3 and x64 engineering).
Related products  
KL6831 SMI master terminals for LoVo
System  
subsystem For further subsystem products please see the system overview.