Siemens SIMATIC S7-400 Manual page 107

The figures show
The connection of company
network and field level
The connection between the
automation system and field
level
The IO controller of the CPU
41x PN/DP ① directly controls
devices on the Industrial
Ethernet and on the
PROFIBUS
A CPU can be both
IO controller and
DP master.
Reference
For further information about PROFINET refer to the
programming manual.
This manual also provides a comprehensive overview of the new PROFINET blocks and
system status lists.
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
Examples of connection paths
From PCs in your company network, you can access devices at the field level.
Example:
PC - Switch 1 - Router - Switch 2 - CPU 41x PN/DP ①.
•
You can 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 - on an IO device of the ET 200S
•
②.
At this point, you see the extended IO feature between the IO controller and IO device(s)
on Industrial Ethernet:
The CPU 41x PN/DP ①is the IO controller for one of the ET 200S ②
•
IO-Devices.
The CPU 41x PN/DP ① is also the IO controller for the ET 200 (DP
•
slave) ⑤ via the IE/PB Link ⑥.
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 41x PN/DP ①is the IO controller for the other ET 200S ②
•
IO-Devices.
CPU 41x PN/DP ③ - Switch 3 - Switch 2 - ET 200S ②
The CPU 41x 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.
6.3 PROFINET IO Systems
From PROFIBUS DP to PROFINET IO
PROFINET
6-5