Posted 27 Feb 2022 I have this setup: FX3G CPU connected to GT2103 through RS422 (CH1). GT2103's ethernet port connected to LAN and set up as modbus TCP slave (CH2). I want to read/write PLC word devices using a modbus TCP client, from a PC. The HMI is acting as a gateway between PLC and PC. I used the Device Data Transfer function to send PLC's D register values to GT's internal GD registers. D0....D9 ==> GD0....GD9 After some tries, I get valid response from the modbus slave. Reading the holding registers 0....9 (40001....40009), I get only zero values. Those registers can be written back with different values, correctly. I'm sure I didn't understand correctly the modbus address mapping to GT's internal memory. Can anybody help me? Thank you. Share this post Link to post Share on other sites
Posted 28 Feb 2022 Why don't you directly transfer between the Ch1 and Ch2 ? So from D0 => 40001 ? Share this post Link to post Share on other sites
Posted 28 Feb 2022 Can you be more specific about how can I do this? From what I've seen, there isn't such an option. Share this post Link to post Share on other sites
Posted 28 Feb 2022 (edited) If more than 1 Ch is set the software first ask you to chose witch one before device and address Edited 28 Feb 2022 by glavanov Share this post Link to post Share on other sites
