schulzkj

Here's a wireshark capture of when I run SP.SOCOPEN  192.168.3.39 is PLC, 192.168.3.205 is the slave

I'm not getting an error.  In the operation status register, it's telling me that it's waiting for data to be received, and data not matched.  I don't have any issues like that when I use the SE tester with the slave unit, or if I use the pyModSlave tester with the PLC CPU. I don't know anything about the wireshark, so I'm currently looking into that.

Hi, I'm having issues getting Modbus TCP communication with my Q06UDVCPU built in ethernet port and a windows based unit being used as a slave. I'm able to use the tester from schneider to run my laptop as a master and get communication with the slave. I'm also able to use the pyModSlave on my laptop and use my laptop as a slave with the PLC as the master.  However, I can't get it to work with the PLC as master and the unit as the slave. I have a connection, and am using Predefined Protocol Function  I open the connection, confirm I have a connection, but when I run the SP.ECPRTCL, I don't get modbus communication between the two. I have a device set for Predefined Protocol Operation Status, and see: +0      3H +1      3006H +2      1005H +3-16  FFFFH As I mentioned, I assume I have all my parameters and control data set correctly, as I'm able to use the testers on my laptop to operate them both as I intend to use them, but when I connect them to one another, this is all I get. I don't have a ton of info on the unit I'm using as a slave, as it's an outside supplier.  They sent us the registers and and bit data we need to accomplish our goal, which I confirmed with the schneider tester, but I have little other information on its programming. Any help is appreciated!