Applies To:
  • CitectSCADA 6.x, 7.x

I am trying to read register 432000 with Modbus v2.6.4.1, but the read fails with an ErrDriver 258 (0x102).

However, I can read the 400000-416000 range properly.

The help file mentions that the 400000-465536 is supported by the driver


This is a bug in Modbus v2.6.4.1, and was fixed in driver hotfix v2.06.17.003. This driver allows reads for the 400000-465536 range. This driver has yet to be officially released. 

Please contact Citect Support to obtain the hotfix for the driver or for further information.


 modbus, address out of range, high register, large address