EDGE_TRIG_REUSED

Severity: error

The same R_TRIG / F_TRIG instance is invoked with two or more different CLK expressions across the POU.

Why it matters. Edge triggers hold internal state ("was CLK TRUE last scan?"). Swapping the CLK between scans scrambles the edge detection, sometimes Q fires on the wrong transition, sometimes it doesn't fire at all.

Settings. No check-specific config.

Trigger.

rTrig(CLK := xButton);
rTrig(CLK := xSensor);             (* fires, same instance, different CLK *)

The bot posts.

🟥 error  EDGE_TRIG_REUSED
R_TRIG instance rTrig is reused with 2 different CLK expressions
CLK values seen: xButton, xSensor. An edge-trigger holds internal
state; mixing inputs scrambles the edge detection. Declare one
instance per CLK source.

Fix. Declare a separate R_TRIG / F_TRIG instance per input signal.