Knowledge Base

Context

When migrating a project from PcVue 15 to 16, you may encounter issues where commands or switches using the “Bit Send” animation no longer work as expected. This occurs specifically under the following configuration:

• Animation Type: Bit send
• Mode: Pulse checked
• Duration: 0 seconds

Analysis & Root Cause

The interpretation of a “0-second pulse” has been updated in PcVue 16 to improve logical consistency.

• In PcVue 15: A 0-second pulse was treated as a Direct Activation, functioning like a standard switch and maintaining the value.
• In PcVue 16: A 0-second pulse is now interpreted literally as an instantaneous pulse. As a result, the value may not be held long enough to trigger the expected state change in the connected device or variable.

Solution

Choose the appropriate solution based on the desired behavior for your equipment:

Case 1: Direct state change

If the control was intended to toggle a state (e.g., turn a valve ON/OFF) and maintain it, the “Pulse” setting is no longer suitable.

1. Open the symbol or mimic containing the control.
2. Open the properties of the “Bit Send“ animation.
3. Uncheck the “Pulse” (Impulsionnel) option.
4. Save the symbol.

This restores the behavior observed in V15, where the switch toggles the state.

Case 2: Momentary signal (True Pulse)

If the PLC or device actually requires a rising edge or a temporary signal:

1. Open the properties of the “Bit Send” animation.
2. Keep “Pulse” checked.
3. Set the duration to a valid time (e.g., 1 second or more).

Note: The value will automatically return to its initial state (0) after the specified duration.