How It Works; Properties - Siemens SIMATIC S7-1500 Manual

connection cables and I/O modules), as well as easy wiring inside the control cabinet (flexible
connection consisting of front connectors with assembled single conductors).
System diagnostics and alarms
Integrated system diagnostics is activated by default for the CPUs. The different types of
diagnostics are configured instead of programmed. System diagnostics information and
alarms from the drives are displayed consistently and in plain text:
• On the CPU display
• In STEP 7
• On the HMI
• On the Web server
This information is available in RUN mode, but also in STOP mode of the CPU. The diagnostic
information is updated automatically when you configure new hardware components.
The CPU is available as a central interrupt server in up to three project languages. The HMI
takes over the display in the project languages defined for the CPU. If you require alarm texts
in additional languages, you can load them into your HMI via the configured connection. The
CPU, STEP 7 and their HMI ensure data consistency without additional engineering steps. The
maintenance work is easier.
3.3

How it works

Principle of operation
The CPU contains the operating system and executes the user program. The user program is
located on the SIMATIC memory card and is processed in the work memory of the CPU.
The connection to the process is centralized or distributed via PROFINET or PROFIBUS with I/O
modules.
The PROFINET interfaces on the CPU allow simultaneous communication with PROFINET
devices, PROFINET controllers, HMI devices, programming devices, other controllers and
other systems. CPU 1518‑4 PN/DP supports operation as an IO controller and I-device.
Similarly to the PROFINET interface, the PROFIBUS interface available on the CPU allows
communication with other devices. When you use the interface as PROFIBUS DP interface, the
CPU on the PROFIBUS DP also assumes the role of a DP master.
3.4

Properties

Article number
6ES7518-4AP00-0AB0
CPU 1518-4 PN/DP (6ES7518-4AP00-0AB0)
Equipment Manual, 11/2022, A5E32334527-AE
Product overview
3.4 Properties
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