R
Hi,
I have a 3rd party Modbus TCP device connected to a Quantum System through a NOE module. When I try to read the holding registers down at the lower addresses around 40001, everything works fine and the data is passed between the device and the Quantum and shows up in the Quantum memory map. The 3rd party device has some registers that are at the 41000, 42000 and 43000 areas of the holding registers and when I try to read these addresses, the Quantum system doesn't show the transferred data. Looking at the packet captures, I can see the Quantum request and the devices response containing the correct data, but yet the data never moves into the Quantum memory map. There are no communication errors shown by the Quantum so it believes everything is OK and yet no data. Any ideas of what's going on? Is there some limitation that the Quantum has for the addressing scheme? I'm at a loss to explain this.
Thanks, Rob
I have a 3rd party Modbus TCP device connected to a Quantum System through a NOE module. When I try to read the holding registers down at the lower addresses around 40001, everything works fine and the data is passed between the device and the Quantum and shows up in the Quantum memory map. The 3rd party device has some registers that are at the 41000, 42000 and 43000 areas of the holding registers and when I try to read these addresses, the Quantum system doesn't show the transferred data. Looking at the packet captures, I can see the Quantum request and the devices response containing the correct data, but yet the data never moves into the Quantum memory map. There are no communication errors shown by the Quantum so it believes everything is OK and yet no data. Any ideas of what's going on? Is there some limitation that the Quantum has for the addressing scheme? I'm at a loss to explain this.
Thanks, Rob