How It Works - Siemens SIMATIC S7-1500 Manual

Product overview

2.2 How it works

Design and handling
The design and handling of the CPUs is very straightforward and offers the greatest possible
user friendliness. All CPUs have a display. The display provides information on order
numbers, firmware version and serial numbers of all connected modules. The IP address of
the CPU and other network settings can be set directly on site, without a programming
device. The display shows occurring errors messages directly as plain text multi-lingual
messages and helps you to reduce downtimes.
System diagnostics
Integrated system diagnostics is activated by default for the CPUs. The different diagnostic
types 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. An automatic update of the diagnostics information is performed
when you configure new hardware components.
2.2 How it works
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 PROFINET interfaces on the CPU allow simultaneous communication with PROFINET
devices, PROFINET controllers, HMI devices, programming devices, other controllers and
other systems. CPU 1515-2 PN supports operation as an IO controller and I-device.
IO controller
As an IO controller, CPU 1515-2 PN sends and receives data and signals from the
connected IO devices within a PROFINET IO system. You can operate the CPU with a
maximum of 256 IO devices, of which a maximum of 64 may be IRT (Isochronous Realtime)
devices.
I-device
In the "I-device" (intelligent IO device) function, CPU 1515-2 PN not only controls its own
central modules, but also acts as an I-device, exchanging data with a higher-level IO
controller. CPU 1515-2 PN thus fulfills the role of an intelligent pre-processing unit for
sub-processes.
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CPU 1515-2 PN (6ES7515-2AM00-0AB0)
Manual, 12/2014, A5E32332431-AB