Hello 

I need help for make task start stop by using plc 1200 connect with hmi delta by use rs485 

I make wiring but when push start on hmi screen no response on plc 

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Split from S7 1200 Modbus RTU Connection.

Hello AutoGen_5807499

Which Delta HMI do you use exactly?

there are a lot of videos and infos in internet regarding S7 PLC and Delta HMi, check these out

Do you have contacted Delta Support also for getting information how to contact to a S7PLC?

Which FW Version does your S7-1200 use?

Bye Murof