what is the minimum pulse width that the BMXDDI1602 can detect?

[RoozeeR]

Hello Bianca,

You have to take into account the response time of the module itself (3-7 mS) but more important the total cycletime of your application in the CPU. If the CPU cycletime is 10 mS, the minimum pulsewidth to detect is 10ms, but better would be 20mS (2* the PLC cycletime), just to be sure that the cycletime is less than your pulswidth (Nyquist-theorem). If the DDI module is located in a remote IO drop, you might need to take the Drop process time, network timing and Network update time (RPI) into account. Basically if you know what the minimum pulsewidth is, and you know what your CPU cycletime is you can make a rough estimate if you can use a standard DDI or you need a High speed module.