On/Off Delay

The On/Off Delay node applies separate delays to the activation and deactivation of a logic signal.

When the Input connector changes from 0 to 1, the node waits for the configured ON delay before sending 1 to the Output connector.

When Input changes from 1 to 0, the node waits for the configured OFF delay before sending 0 to Output.

This node can be used, for example, to:

• delay the activation of a device;
• keep an output active for a specified time after the input has been deactivated;
• prevent immediate switching after a signal change;
• apply different delay times to activation and deactivation.

For the general operation of the Gate connector, refer to Gate connector.

When Input receives a rising edge, therefore changing from 0 to 1:

1. the node starts the ON delay;
2. during the delay, Output maintains its previous value;
3. when the delay expires, Output changes to 1.

When Input receives a falling edge, therefore changing from 1 to 0:

1. the node starts the OFF delay;
2. during the delay, Output maintains its previous value;
3. when the delay expires, Output changes to 0.

When Reset is set to 1:

1. any timing operation in progress is stopped;
2. the value 0 is immediately sent to Output;
3. the configured delays are not applied to the reset operation.

Assume the following delays are configured:

• ON delay: 5 seconds;
• OFF delay: 10 seconds.

The node operates as follows:

One possible application is the delayed control of a fan:

• the fan is activated only after the command has remained active for the configured time;
• when the command is deactivated, the fan remains active for the configured OFF delay before switching off.

To verify the operation of the node using Offline Simulation:

1. Connect an input node to the Input connector.
2. If required, connect a second input node to the Reset connector.
3. Start Offline Simulation.
4. Set Input to 1.
5. Verify that Output changes to 1 only after the ON delay.
6. Set Input to 0.
7. Verify that Output changes to 0 only after the OFF delay.
8. While a delay is in progress, set Reset to 1.
9. Verify that the timing operation is stopped and Output immediately changes to 0.

• The ON and OFF delays can be configured independently.
• The Reset connector can be used to immediately return the output to the inactive state.
• Verify that the node receives an initial value on Input before evaluating its behavior.
• If the Gate connector is used, make sure that it receives a valid value; otherwise, the node may remain disabled.
• Use Await all inputs when processing must start only after all connected inputs have been initialized.

• Logic Module
• Timer nodes
• Continuous Pulse Generator
• Pulse Train Generator
• Stairwell Lighting Switch