Each analog outputs from 1 to 8 has its own control and status byte. The hold bit is bit 1.
For example, to monitor and control the hold status of AO:
Configure a point with address AO.HOLD, bit offset 0.
After CIMPLICITY software sets a value in AO, AO.HOLD has a value of 1.
To release control of AO back to the DX9100 programming, set AO.HOLD to 0.
Releasing DX9100 output holds.