1 AC500 as modbus master and 3 follower
We have one modbus masters(a500 ) on COM1.
and and three drives as slave.
I am using COM_MOD_mast to wrie the data. Since i have 3 slaves, the slave station address is going to be different in each COM_MOD_MAST.I have used FCT 3 to read and FCT6 to write the data so My question is it possible to add three COM_MOD_MAST for each slave?? How is it done?
i tried this way too but only one drive talks, the other two drives does not get any respond at all. I have termination resistor on db9 com1 , pin 3 and pin8.
Please.. need your advice..
Yes you can do it...
you just confirm that are you able to communicate independent slaves...if yes then just take done bit from 1st COM_MOD_MAST and connect it to 2nd COM_MOD_MAST and like wise third one.....
Make sure that you have to give positive trigger bit to COM_MOD_MAST always in order to get the data always...so you can use "Blink" function block and make it on time and off time as 1 sec for initial testing...
Hope it helps..