how to retain the encoder value when turn off the supply.

hi,

i have siemens s7300 313c-2dp plc i have configured encoder by using hardware configurature but i am facing a problem when i turn off the supply of plc my counter value becomes zero. i am using a sfb47 block .do you have any idea regarding this situation.

thanks.... 

Hi,

You can store these values in a retentive DB.

Have a look at the SIMATIC S7-300 CPU 31xC and CPU 31x: Technical specifications under chapter "5.1.3 Retentivity of memory objects".

Keep in mind the "NON-Retain" property in DB's in question.

I hope I could help!