Issue
The setpoint values are displayed briefly and then change to 621.X on the Proview display?
Environment
All LON proview installations.
Cause
This occurs when the setpoints are being written into network variable inputs (nvi). The nvi's default to using the receive heartbeat and will fallback to default after the timeout occurs.
Proview does not perform a send heartbeat function as the connection is an nv update and not an actual binding. The receive heartbeat mechanism in the MNL controllers cause the nvi values to fallback to NA upon heartbeat timeout.
Resolution
The heartbeat can be disabled for the setpoint nvi, however nvi values are stored in RAM (not EEPROM) and will return to default upon a controller power cycle.
The best solution is to use network configuration inputs (nci) for setpoint displays on the Proview. These do not have the heartbeat issue and the values are maintained in EEPROM so they are not lost following a controller power cycle.
