How It Works - Siemens Simatic S7-1500 Manual

Product overview

2.3 How it works

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 is shown
uniformly and in plain text on the display of the CPU, in STEP 7, on the HMI and on the Web
server, even for alarms related to drives. 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 for 3 languages. The CPU, STEP 7 and
your HMI guarantee data consistency without additional engineering steps. The maintenance
work is easier.
2.3 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 1516-3 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.
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CPU 1516-3 PN/DP (6ES7516-3AN01-0AB0)
Manual, 09/2016, A5E03461313-AD