Siemens SIMATIC ET 200AL, System Manual

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Functions
5.10 Standard machine projects
PROFINET with STEP 7
270
Function Manual, 05/2021, A5E03444486-AL
Additional information
For information on the basic structure of the data record and on using the instruction
"ReconfigIOSystem" see the STEP 7 online help.
See also
Configuring IO devices as optional (Page 1)
5.10.2.4 Configuring flexible order of IO devices
The following section shows how you can create the conditions required to change the order
of IO devices in a PROFINET IO system.
This function is also supported with optional IO devices. For simplicity, a maximum
configuration without optional IO devices is shown below.
Concept
A typical application for a standard machine project consists of composing an entire plant
from a set of various plant units which only differ with respect to the different arrangement
of the units, e.g. in the case of transport systems. Each plant unit consists of a functional unit
of mechanics (rails or conveyor belts) and electrics (power supply, IO device with IO modules,
sensors, actuators, motors, PROFINET port for data exchange with central control ...).
The following figure shows how, simply by exchanging two rail segments, a new transport
system is created that is adapted with an upstream points to the local conditions.
Figure 5-103 Example: Changing the arrangement of IO devices
From the automation viewpoint, no change in the project is required for the flexible
adjustment of the PROFINET configuration.
The order of the IO devices is determined by the port interconnection. For each IO device,
you define in the port properties the partner port and thus the neighboring device connected
at the respective local port. If the partner port is to be defined by the user program, the
option "Partner set by user program" is to be selected as partner port.