Principle of operation

The two SMI master terminals KL6831 and KL6841 enable the operation of 16 SMI drives (blinds/roller shutters) per terminal and support the complete SMI functionality. Ready-made function blocks are used to realize up, down and stop commands, travel to any position, adjustment of the slat angle and feedback on the current position of the motor/blind in the PLC user program. The SMI master terminals implement the process data (movement commands in the PLC program) in the SMI protocol, including level conversion. The terminals require an external 24 V_DC supply. The K-bus, the 24 V supply and the SMI connections are electrically isolated from each other.

Addressing of the SMI drives and programming of the SMI master terminal

Addressing of the SMI drives and programming of the SMI master terminal is described in the software documentation in the Beckhoff Information System:

TwinCAT 2: TwinCAT PLC Lib: SMI
TwinCAT 3: TwinCAT 3 PLC Lib: Tc2_SMI