Write the value while maintaining Bad Quality on the OPC DA Tag.|Classic OPC: DA, A&E, HDA, XML-DA, etc.|Forum|OPC Foundation

If you write a value via OPC DA then that value should the result of a read or reported in an update.

There are edge cases where a write is accepted by the server but overwritten by internal logic which could create a situation where the client cannot read fast enough to see the change before the override. But these edge cases do not change the principle that what is written must be returned in a read.

If the value is being written via internal logic then you have more flexibility.