High Speed Counter Problem

[kaatni 0]

Hi Forum

High speed counter on Siemens CPU226 is playing up. CV reading from it does not match to PV and keeps increasing and increasing. Eg PV set at 1800 but CV just keep increasing past this point. I cant clearly see if it jumps above the 1800 point so does not  register as having reached the value.

 

Is this a problem with PLC or the Encoder?

 

thanks

[Jairus 5]

hi, try to replace your encoder. i don't know what's exactly the history of your machine. if that's an old encoder and working before, a big possibility that is defective, or connections and cable issue.  if your encoder is new and not exactly the same spec as the original one , then try to check again its specification and the hardware configuration in the plc. You might use different plc, but in  s7-1200 sometimes you might adjust the input filters, or sometimes i might use word math instruction to create some factors for specific application or just to meet a certain requirement.