Siemens SIMATIC ET 200AL, System Manual

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Functions
5.7 Isochronous mode
PROFINET with STEP 7
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Function Manual, 05/2021, A5E03444486-AL
Procedure
To create an isochronous connection between the I/O and user program, follow these steps:
1.
Select the IM 155-5 PN HF in the network view of STEP 7. Change to the device view.
2. Insert an I/O module that can be operated isochronously (e.g. DI 16 x 24VDC HF).
3. Go to the "I/O addresses" area in the Inspector window of the selected I/O module.
Figure 5-73 Configuring isochronous mode on PROFINET IO
4. Make the following settings in the I/O addresses area:
– Select the "Isochronous mode" option.
– Select a process image partition, e.g., process image partition 1.
– Click the "Organization block" drop-down list. Click the "Add" button or select an
existing OB. A dialog box for selecting organization blocks opens.
– Select the "Synchronous Cycle" OB. Confirm the selection with "OK".
In the case of automatic number assignment, OB 61 will be generated and opened.
In the Inspector window, you can continue directly with the setting of the application
cycle and delay time (Page 1) in the "Isochronous mode" area and start the
programming of the OB in the instruction section.