Communication
3.2 Communication services
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
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 Examples of connection paths
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 PN/DP ①.
The connection between the
automation system and field
level
You can, of course, also access one of the other areas in Industrial Ethernet from an IO
supervisor at the field level.
Example:
• IO supervisor - Switch 3 - Switch 2 - ET 200S IO device ②.
The IO controller of the CPU
31x PN/DP ① directly controls
devices on the Industrial
Ethernet and on the
PROFIBUS
At this point, you see the extended IO feature between the IO controller and IO device(s)
on Industrial Ethernet:
• The CPU 31x PN/DP ①is the IO controller for one of the ET 200S ② IO-Devices.
• Die CPU 31x PN/DP ① is via the IE/PB Link ⑥ also the IO controller for the ET 200
(DP slave) ⑤.
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 PN/DP ③ is the IO controller for the the other ET 200S ② IO device.
CPU 31x PN/DP ③ - Switch 3 - Switch 2 - ET 200S ②
• The CPU 31x 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.
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