The CPU 1518-4 PN/DP is the fastest S7-1500 CPU with very large program and data memory for demanding tasks in applications that also contain distributed automation structures alongside central I/O. It can be used, for example, as a central controller in production lines or as a machine controller with high processing speed demands.

The CPU 1518-4 PN/DP can be used as a PROFINET IO controller or as distributed intelligence (PROFINET I-Device). The integrated PROFINET IO IRT interface is designed as 2-port switch so that a linear topology can be set up in the system.
Two additional integrated PROFINET interfaces with separate IP address can be used, for example, for network separation. Additional PROFINET IO RT devices can be connected via the PROFINET interface X2 or fast communication can be established in the form of an I-Device. The X3 interface can be used with a transmission rate of 1 Gbit/s, e.g. for communication with the backbone. Distributed I/O can be connected via PROFIBUS via the integrated PROFIBUS interface.

In addition, the CPU offers comprehensive control functionalities as well as the ability to connect drives via standardized PLC-open blocks.