Posted 26 May 2013 If I have to write an input on Discrete I/O module on Modicon M340 PLC , I know I can use %I. Now I have to use modbus and read some additional inputs from another device other than the one on the I/O module.How shall I write their addresses on the I/Omodule? Also what is the proper adrdressing format of inputs you want to read through modbus? Share this post Link to post Share on other sites
Posted 4 May 2015 Hi Tahir, In order to read or write any value on Modbus, you should know the register numbers. In addition to register number, you should also know function codes. I guess, you can find some helpful information at the link: http://www.icpdas-usa.com/modbuswebtraining.php?r=kaan Share this post Link to post Share on other sites
Posted 5 May 2015 Never understand why someone need to write the digital inputs :( Share this post Link to post Share on other sites
Posted 20 Oct 2015 Dear All Please help me how to check RS 458 communication inverter to PLC good or not good this part Because i am already to try change the new one inverter can't to connection with command from PLC SCHNEIDER on screen inverter written NSC not rdy status (if rdy has communication is success) thank you best regards ulik Share this post Link to post Share on other sites
Posted 11 Jan 2020 dear ulik mohon bantuan juga saya juga mau mengontrol VSD atv12 dengan plc autonics LPS070 dan hmi gxu 3512 mohon bantuannya Share this post Link to post Share on other sites