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This instruction works for both Modbus RTU
and Modbus TCP When you select The Serial port, this will
be Modbus RTU, and the Unit ID will address the slave’s node number. If you select an Ethernet port, this will
be Modbus TCP, and you will have these addressing options. Typically the Modbus TCP Port is 502 and the
unit ID is 255, consult your slave’s documentation if this does not work. The function code determines what addressing
you can write to. Notice when you select a function code this
part changes. So if you are trying write to 400001, select
function code 6 or 16 and you will only need to enter the offset of 1 here. These are the ways that this instruction can
be triggered. I usually set the instruction for the following
settings with a constant time of 1 second until I can verify I have good Communications. For more information on this instruction click
here