The value of inputs, outputs and values, such as non-calculated setpoints, control mode selectors, and digital override switches can be edited in Operator Display.
Many inputs, outputs and values receive their value from the system. For example, from a program sequence or a time schedule in the device or server application, or from a connected field device, such as a sensor.
When you edit the value it returns to the value received from the system. For example, if you edit the value of a calculated setpoint it will return back to the calculated setpoint value.
When you force a value you override the value that is received from the system. The forced value is then used to control the system equipment. When you release a forced value, the value returns to the value received from the system again.
You normally do not have to force values. The system is configured so that values intended to be edited, such as non-calculated setpoints, control mode selectors, and digital override switches, are editable without having to be forced.
When you force a value in Operator Display, the BACnet command priority is by default set to priority level 8. This is the suggested priority level for manual operations based on the BACnet Standard. For more information, see BACnet Command Priorities .
As an administrator, you can change the BACnet command priority level for forced values. Be careful when selecting the priority level. If higher priorities are used, it may interfere with higher-priority equipment, such as manual life safety, automatic life safety, or critical equipment control.
For more information, see Configuring the BACnet Command Priority Level for Forced Values .
On the inputs, output and value detail screens, a forced value is indicated by the Force toggle being dark gray