I meet the same problems. One project parallel for 2 GPIO pins, and that is NOT working properly. I use Raspberry PI 4B+, and Codesys v3.5.18.2 After hard work, I found the solution to overcome this problem: 1) MUST put every SoftPWM function block in a SEPARATE IEC-task with high priority (priority 0 or 1) 2) MUST set every Iec-task's cyclic interval small enough! for example, 50us. I found if the interval greater than you need frequency, the PWM signal on the GPIO pin is not as it should be. And...