# Creating Monitoring Variables

Once PROFINET communication is up properly, create the monitoring variables. To prepare for the procedure, first open the PROFINET IO Module Reference Table. . This reference table is for checking which signals you need for the configured application. You can add the necessary signals to the symbols in SIMATIC Manager, and you can name the signals to monitor easily.

Perform the following steps to create the monitoring variables:

1. Click on S7 Program in the job tree in SIMATIC Manager, and then double-click on Symbols.

2. Fill the table, and then save it by clicking on the Save icon. This is necessary to see the names of the variables when they are monitored.

3. Click on PLC => Monitor/Modify Variables to open the monitoring window.

4. Fill the Address column. The Symbol name fills automatically based on the symbol table configured in the previous step. Save it for future use.

5. Click the Monitor variable icon, so that the Status value column is updated cyclically, and the changes coming from the In-Sight vision system can be monitored. To modify a variable in this case, type the new value in the Modify value column, and then click the Activate modify values icon.