Knowledge Base

Context

When migrating a project from PcVue 15 to 16, you may notice that certain commands or switches using the “Bit Send” animation stop functioning as expected.

This issue specifically occurs 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 ensure greater logical consistency.

• In PcVue 15: A pulse setting of 0 seconds was interpreted as a Direct Activation (Latch). It functioned like a standard switch, maintaining the value.
• In PcVue 16: A pulse setting of 0 seconds is interpreted literally as an instantaneous pulse. Consequently, the value may not be held long enough to trigger the expected state change in the connected device or variable.

Solution

Depending on the desired behavior for your equipment, apply one of the following two solutions:

Case 1: You require a direct state change (Latch/Switch)

If the original intent of the control was to change a state (e.g., turn a valve invalidation ON/OFF) and keep it there, the “Pulse” setting is no longer appropriate.

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: You require a 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. Change the duration from 0 to a valid time (e.g., 1 second or more).

Note: With this setting, the value will return to its initial state (0) automatically after the defined duration.