Siemens SIMATIC ET 200AL, System Manual

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Functions
5.10 Standard machine projects
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
269
• Commissioning extensive I/O systems (more than 8 optional IO devices) while using IRT at
the same time:
To keep the startup times short when activating the optional IO devices
(ReconfigIOSystem, mode 3), note the following tip: Check the device numbers of the
IO devices. The device numbers should follow the topological interconnection starting at
the IO controller in ascending order. The further an IO device is from the IO controller
topologically, in other words the more IO devices there are between the IO controller and
the IO device in question, the higher the device number should be.
You set the device numbers in the "Ethernet addresses - PROFINET" area in the Inspector
window with the PROFINET interface selected.
Example of the assignment of device numbers with a linear topology:
Figure 5-102 Example: Device numbers in a line topology
• The CPU processes the instruction "ReconfigIOSystem" to transfer the control data record
asynchronously.
For this reason, you must call "ReconfigIOSystem" in a loop repeatedly when calling the
instruction in the startup program until the output parameter "BUSY" or "DONE" indicate
that the data record has been transferred.
Tip: To program the loop, use the SCL programming language with the instruction REPEAT
... UNTIL.
REPEAT
"ReconfigIOSystem"(REQ := "start_config_ctrl",
MODE := 1,
LADDR := 64,
CTRLREC := "myCTRLREC".ArrMachineConfig0,
DONE => "conf_DONE",
BUSY => "conf_BUSY",
ERROR => "conf_ERROR",
STATUS => "conf_STATUS");
UNTIL NOT "conf_BUSY"
END_REPEAT;