group of IO/Devices & MODNET1 mixing registers

See knowledge base article TN30003 for an explanation of using device group parameters. Sorry, it won't let me post a link. Basically, you set the I/O Device Address to <node> <groupname>, like Address: 1 GroupA

The MODNET1 protocol variant tells Plant SCADA that the first address is 400000, instead of the normal 400001. If that is incorrect, then your addresses will all be off by 1. They should not be off by 2 registers like you reported, though.

If you are reading a REAL or LONG variable, then Plant SCADA will read 2 registers (422119 and 422120) to get a 32 bit value. However, some devices use nonstandard byte order and you have to set a citect.ini MODNET parameter to set the desired byte order.

If you have some REAL or LONG variables on even addresses and others on odd addresses, Plant SCADA doesn't like it and you will get a compile error. If you disable the error with a citect.ini parameter, then it is possible that the runtime may read the value from one register before or after. This only happens if one 32-bit even address and one 32-bit odd address are read in the same request because they are very close to each other in the PLC's memory.

Thank you so much, it is working now

Thank you so much, it is working now