2 Common Specifications of IAG Executing Backup of NX-series Safety Control Units IAGs read out the Safety Unit restore file in the SD Memory Card inserted to the NJ/NX-series CPU Unit and verify the safety signature information. The IAGs also read out the safety signature of the validated program in the NX-series Safety Con- trol Unit. After comparing the two safety signatures, the IAGs aborts the backup if they find the two signa- tures are different. If the comparison shows they match, the IAGs read out the Safety Unit restore file and write the data into the specified save-in location.
Simultaneously, they also write the data to the SD Memory Card in the NA-series Programmable Terminal and save as the latest backup data. NA-series Programmable Terminal Save-in location of backup data (1) Read safety signature data (2) Read safety signature data USB Memory FTP server Ethernet (4) Transfer restore file NA-series data NX-series Safety Unit Restore File NX-series data NX-series CPU Unit NX-series Safety Control Unit NX-series NX-series Safety Control Unit data Communication Control Unit Backup data 2-4 Programmable Terminals NA-series Practices Guide NJ/NX/NA-series Backup and Restore IAG (V127) ory Card (3) Compare SD Mem ory Ca (3) Compa re safety sign SD Memory Card Data