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Requirements for the LSAP reservation
• CM 1542-5 with firmware version V2.0.20 or higher
• STEP 7 Professional V15.1 Update 2
Preparation of existing projects
If you want to use the function in an existing STEP 7 project up to V15.1, do the following:
1. Load the firmware version mentioned above into the respective CMs.
2. Update your version of STEP 7 to the version mentioned above or a higher version.
3. Open your STEP 7 project.
4. Select a CM in which you have loaded the current firmware.
5. Select the "General" parameter group and click on "Update module description".
If you use several identical CMs in your project, you have the following choice:
– Update only the selected CM
– Update all CM of this type in the project
Update the CM(s) according to one of these two options.
Reservation of the LSAPs
1. Select the parameter group "PROFIBUS interface > FDL-LSAP configuration" in an updated
CM.
The table of LSAPs is disabled by default. Only the standard LSAPs 2..32 can be used for
FDL connections.
2. Select the option "Enable LSAP reservation for FDL".
The individual LSAPs of the table can be enabled. You can reserve LSAPs for FDL
connections in the above areas.
FDL: Receiving data in CM via programmed layer 2 connection
Programmed connections are not configured on the modules. Connection establishment
works dynamically via a block.
Proceed as follows to receive data from multiple PROFIBUS nodes and remoteLSAPs:
1. Open the program editor of the station.
The "Instructions" task card opens.
2. Create a "TCON" block to establish the FDL connection:
Instructions > Communication > Open user communication > Others > TCON
3. Create a global data block for the connection description of the FDL connection.
SIMATIC CM 1542-5
Operating Instructions, 01/2023, C79000-G8976-C290-07
Configuration, program blocks
3.4 Configuration of the extended LSAP area
31
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