Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 47)

Communication
3.2 Communication services
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
3-19
3.2.10.1 PROFINET IO System
Extended Functions of PROFINET IO
The following graphic shows the new functions of PROFINET IO
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The graphic displays You can see the connection path in the graphic
The connection of company
network and 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 connection between the
automation system and field
level
You can, of course, also access other areas in Industrial Ethernet from a PG at the field
level.
Example:
•
PG — Switch 3 — Switch 2 — to an IO device of the ET 200S (2).
The IO controller of the CPU
31x-2 PN/DP (1) controls
devices on Industrial Ethernet
and on PROFIBUS directly
At this point, you see the extended 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 Industrial Ethernet.