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Is it possible to give Start/Stop commands from PLC via Modbus Port on LUCM module of TeSys U.

You can connect the Modbus port of LUCM module (Multi Functional Control Unit) of TeSys U controller with PLC in order to access all the registers, except the registers from 680 to 705. To access these registers for write function, you need a communication module depending on the protocol. 

Therefore the command registers (like Start/Stop) 700,703,704,705 cannot be accessed for writing by the PLC via LUCM Modbus port. However, you can read and monitor the values of Tesys U controller.
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