Modbus FB for a Premium PLC

Steve_D

Member
S
Join Date
Jul 2002
Location
Albury/Wodonga
Posts
92
Guys, I have a Premium CPU (TSX957) with a SCY21601 Modbus Card and I need to talk to a Valve drive over modbus. I can set up the comms parameters (9600,8,1 etc) on the card but cant find out how to define my data (I want to read (function 3) 2 words (2) starting from adress 1234). Is there a function block that I am missing that handles this? I am using Unity pro V5.
Thanks in advance.
 

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