Switching value signal anti shake FB of PLC signal processing series

quite a lot PLC Yes DI Filtering function , But some PLC No, , In many industrial sites, the on-off signal is easily affected by external disturbance factors to produce short-term maloperation , Sometimes we don't want this malfunction to happen . At this time, it is necessary to introduce the on-off signal anti shake function . In other cases, our signal delay may be due to process requirements , Not just because of anti shake . Now let's see how to design anti shake FB

1、SMART PLC Filter time setting

 2、 Switching value anti shake FB(FX3U）

 3、 Local variable interface definition

  For the description of local variable interface, please refer to the following blog to explain in detail ：

Mitsubishi PLC Global label and local label programming application problems _RXXW_Dor The blog of -CSDN Blog _ Mitsubishi label programming Mitsubishi's global label and FB The local label of is equivalent to global variables and local variables in high-level languages , They all have their own scopes . If the variable is declared in the main function ,