Send / receive negative values over OPC with DSC --> Device failure

[_EMG_]

I try to send a negtive value (e.g. -1) but the Tag Monitor shows "Device failure". A positve value works fine (Quality: Good)!

When accessed the variable the directly with a DataSocket connection there is no problem with negative values.

Is it possible to declare the datatype of each variable in the Tag Cofiguration Editor? Haven´t found yet ..!