Chapter 7 Function Block and Library Users can use FB_NP in place of NP in a function block, but they have to specify a device, e.g. M300 in the figure below. PN can be used in a POU of the program type. Users can use FB_PN in place of PN in a function block, but they have to specify a device, e.g. M400 in the figure below. 7.3.3 Monitoring the Program in a Function Block It is the functions block instances in a project that participate in the execution of the program in the project. If users want to monitor the program in a function block online, they have to open the window for the function block instance.
If users want to monitor the program in a function block online, they have to open the window for the function block instance, as shown below. The function block instances below operate independently. 7-35