Siemens SIMATIC ET 200AL, Системное руководство

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Functions
5.12 Docking systems
PROFINET with STEP 7
280
Function Manual, 05/2021, A5E03444486-AL
Requirements for interconnecting alternating partner ports during operation
You can interconnect IO devices with alternating partner ports during operation in the
following situations:
•
The alternating IO device (docking unit) has no IRT communication configured.
• The PROFINET interface is connected to the Ethernet subnet.
• The PROFINET devices support topology configuration.
• The IO controller, the alternating IO devices (docking unit) and the switch (docking
station) on which the alternating IO devices are to be operated support this feature.
Note
Unique IP address
Each docking unit of a docking system must be configured with a unique IP address in a
shared project and operated on the same IO controller as all other docking units of the
system.
Applicative conditions
The following points should be observed when implementing a docking system with
alternating IO devices during operation:
•
The IO devices of all docking units must be deactivated by default in the configuration.
• At any time, only one docking unit can be active, i.e., only the IO devices of one docking
unit can be activated. All IO devices of other docking units must be deactivated or become
deactivated before the IO devices of a docking unit can be activated. You activate an IO
device with the "D_ACT_DP" instruction.
• A physical connection to this docking unit and its IO devices must be created in order to
activate a docking unit. The IO devices are then switched on (power on). At the same
time, all the IO devices of this docking unit must be activated in the user program with the
"D_ACT_DP" instruction.
Note
Automatic deactivation in "Startup" mode of the CPU
If the CPU is in "Startup" mode, IO devices of a docking system that alternate during
operation are deactivated automatically.