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How to How to 2/10/2022
Products: Operator Display
Functionalities: Basic Functionality
Product version: 3.3, 2022

Forcing a Binary Input, Output, or Value

You force a binary input, output, or value to override a value received from the system.

Warning Warning

Unintended equipment operation

Do not force values without knowing the effect.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

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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.

Forced Values

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.

Warning Warning

Unintended equipment operation

Do not force values without knowing the effect.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

BACnet Command Priorites for Forced Values

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.

Warning Warning

Unintended equipment operation

Do not configure the BACnet command priority level for forced values without knowing how the priority level may interfere with higher-priority equipment.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

For more information, see Configuring the BACnet Command Priority Level for Forced Values .

Indications

On the inputs, output and value detail screens, a forced value is indicated by the Force toggle being dark gray . On the input, output and value screens, a forced value is indicated by an yellow circle and the text Forced .

To force a binary input, output, or value
  1. In Operator Display, on the Device List screen, tap the arrow button to select the device with the with the binary input, output, or value you want to edit.

  2. On the Device screen, tap the Inputs , Outputs , or Values arrow button .

  3. On the Inputs , Outputs , or Values screen, tap the Binary arrow button .

  4. On the Inputs , Outputs , or Values/Binary screen, tap the arrow button to select the binary input, output, or value you want to force.

  5. On the inputs, outputs, or values detail screen, tap + or - to edit the value of the binary input, output, or value.

  6. Tap Force to override the value received from the device.

  7. Tap OK .

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