Why we do use more than one networks in Ladder logic of Siemens PLCs ? thanks

[phatcreators]

Why we do use more than one networks in Ladder logic of Siemens PLCs ?

whats the need of using more than one networks in programming a task inside S 7 Simatic Manager of Siemens S7 PLCs in Ladder logic ?

thanks

 

[FvM]

I'm rarely using ladder for PLC programming, mostly ST(SCL), FBD(FUP) and SFC(Graph). But regularly a separate ladder network will be used for each output or flag signal.