Siemens Simatic S7-300 CPU 315-2-PN/DP - Example of a PROFINET IO System

Configuring
4.11 Planning subnets
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
4-59
4.11.3.8 Example of a PROFINET IO system
Extended Functions of PROFINET IO
The figure below shows you the new functions of PROFINET IO
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The figure shows The figure shows the communication path
The interconnection of the
company network with field
level
From PCs in your company network, you can access devices at the field level
Example:
• PC — Switch 1 — Router — Switch 2 — CPU 31x-2 PN/DP (1).
The interconnection between
the automation system and
field level
You can, of course, also access other areas in Industrial Ethernet from a field PG.
Example:
• PG — Switch 3 — Switch 2 — to an IO device of ET 200S (2).
The IO controller of the CPU
31x-2 PN/DP (1) controls the
nodes connected to the
Industrial Ethernet and
PROFIBUS directly
At this point, you see the enhanced IO feature between the IO controller and IO device(s)
on Industrial Ethernet:
• The CPU 31x-2 PN/DP (1) is the IO controller for one of the ET 200S (2) IO devices.
• The CPU 31x-2 PN/DP (1) is also the IO controller for the ET 200 (DP slave) (5) via
the IE/PB Link (6).
A CPU can be both IO
controller and DP master
Here, you can see that a CPU can be both IO controller for an IO device as well as DP
master for a DP slave:
• The CPU 31x-2 PN/DP (3) is the IO controller for the other ET 200S (2) IO device.
CPU 31x-2 PN/DP (3) — Switch 3 — Switch 2 — ET 200S (2)
• The CPU 31x-2 PN/DP (3) is the DP master for a DP slave (4). The DP slave (4) is
assigned locally to the CPU (3) and is not visible on the Industrial Ethernet.