I am reading/writing strings from a Modicon Quantum controller successfully except for some holding register addresses:
[MOD2ATU]HRS152:10 (Registers 40152 - 40156) Returns string ‘042031655’
[MOD2ATU]HRS202:10 (Registers 40202-40206) Returns null or blank string (actually contains same value as above)
If this or another tag pointing to this address is changed to a different data type, it returns values. The OPC Server shows ‘Good’ data quality on all tags and the Modbus V2 driver shows to be polling each of the tags.
Thanks for any help on this.