FX3U-485ADP-MB Modbus RTU settings

[Neel Moor]

Hello guys,

I'm new with modbus communication protocol, I try to communicate between PLC and Oriental Motor Controller, but I cannot establish the communication, the RD and SD are turned off. Im using 1 pair wiring, and I connect the TR+(From Oriental controller) to SDA-RDA and TR-(From Oriental controller) to SDB-RDB which is indicated in the manual. I don't know if this is correct because I was reading in the forum and I saw that some of you recommended to invert the  wires?

Im trying to setup the PLC as a master and try to write in a register in the slave (Oriental motor controller), but as I mentioned to you I have no communication at all, I think maybe I have something wrong in the code (See attached picture of the code), 

Please If some one here can help me to solve this issue, I will be very grateful. Thank you guys

[Bryll]

Write "H1C97" instead of "H1097" to D8400

[Neel Moor]

3 hours ago, Bryll said:

Write "H1C97" instead of "H1097" to D8400

Hi Bryll,

Thanks for your help Im going to try this, I put this to zero because the bit8 to 11 are reserved, Im going to try your suggestion and let you know,

If you have any other suggestion please let me know