2 Common Specifications of IAG 2-1-3 Comparison You can use IAGs to compare the latest backup data and the current status of actual devices for verifi- cation. For this comparison, use the latest backup data you saved in the SD Memory Card in the NA series Programmable Terminal. Users cannot specify which data to be used for such comparison. Behavior of Each Device and Data Flow IAGs write data to each device and execute a comparison by using each device’s function as shown in the figure below. The comparison is executed on all the devices configured as the backup target.
Even when you configure the settings to back up only device data that has been changed since the latest backup, the comparison is executed on all the devices configured as the backup target. Executing Comparison of NJ/NX-series CPU Units The IAGs access the latest backup data to read out data of the NJ/NX-series CPU Unit, and then write it to the SD Memory Card in the NJ/NX-series CPU Unit. They execute a comparison by using the SD Memory Card backup function of the NJ/NX-series CPU Unit.
NA-series Programmable Terminal (3) Read comparison results of the SD Memory Card backup function NA-series data (2) Start a comparison using the SD Memory Card backup function NJ/NX-series data NX-series Safety Control Unit data Ethernet Last backup data (1) Transfer data CPU Unit NJ/NX-series Safety Control Unit* NX-series * Cannot be mounted to NJ-series CPU Units 2-10 Programmable Terminals NA-series Practices Guide NJ/NX/NA-series Backup and Restore IAG (V127) ory Card SD Mem ory C Data Card D Memory Card