Application Download

 

EcoStruxure Machine Expert - Safety provides the possibility of creating an external application image file of the safety-related project. An appli­cation image is a binary container file which contains all relevant project data required for parameterizing, commissioning the Safety Logic Controller, and executing the safety-related application. Hence, it includes the compiled safety logic as machine-readable code as well as the entire parameterization data of the safety-related devices involved (SLC and input/output devices).

Via the SERCOS III object interface, the application image (container file) can be transferred to the memory key of the Safety Logic Controller. This is done using a special function block in the LMC standard applica­tion. For that purpose, EcoStruxure Machine Expert provides the FB_DownloadApplication function block (contained in the SlcRemote­Controller library). This function block handles the Safety Logic Controller object interface, automatically executes the download sequence, and initiates an SLC restart.

After having received the application image and the following restart, the Safety Logic Controller automatically loads and executes the safety-related program contained in the application image. This way, the safety-related program can be downloaded and commissioned outside of and without using EcoStruxure Machine Expert - Safety.

To ensure project security, the Safety Logic Controller password must be applied as input value to the FB_DownloadApplication function block and the user has to confirm the project CRC of the downloaded applica­tion image after the download.

Prerequisites

An application image of the project can only be created if the following prerequisites are fulfilled:

• You are logged-on to the project in EcoStruxure Machine Expert - Safety on 'Development' level.

• A Safety Logic Controller password has already been configured in EcoStruxure Machine Expert - Safety.

• The project has been compiled (built) without any compiler errors.

• The Safety Logic Controller device parameter 'ApplicationDown­loadAllowed' is set to 'Yes'.

  To set this parameter, select the SLC node in the 'Devices' window. After selecting the controller, its parameters can be edited in the parameter grid right beside the devices tree.

How to create the application image in EcoStruxure Machine Expert - Safety

1. Compile the project as described in topic "Compiling the project".

2. Select 'Project > Application Download'.

   If the menu item is inactive, the project could not be built success­fully. Correct any errors and rebuild the project.

3. Select a target directory and a file name for the binary file. The file extension *.bin must not be changed when storing the file.

   The binary application image file is now generated and stored as specified before.

The binary application image file is now ready for downloading as described below.

How to download the application image to the Safety Logic Controller

After having created the binary file (application image), it can be down­loaded to the Safety Logic Controller as follows:

1. Copy the application image (*.bin file) to the CompactFlash card of the standard PacDrive 3 controller (LMC) and insert the Compact­Flash card into the LMC.

2. In EcoStruxure Machine Expert - Safety:

   During the following download procedure, the function block will request the confirmation of the project CRC. This CRC has been calculated by EcoStruxure Machine Expert - Safety while building the project. It is listed in the 'SafePLC Info' dialog.

   Open the 'SafePLC Info' dialog and take note of the CRC to be able to confirm it later.

   NOTE:

   Use the CRC listed in the 'PC' area on the right side of the 'SafePLC Info' dialog (not the checksum displayed in the 'SafePLC' area on the left).

3. Continue in EcoStruxure Machine Expert:

   Insert the FB_ApplicationDownload function block provided in the SlcRemoteController library into a POU and connect its formal parameters.

4. To ensure access to the Safety Logic Controller as well as the download of the correct application image, validate that correct values apply to the inputs i_ifSafeLogic, i_sFilePath, and i_sPass­word.

5. Activate the FB_ApplicationDownload function block with i_xEnable = TRUE.

6. Execute the download by applying a rising edge at the i_xExecute function block input.

7. Now you have to verify and confirm that the downloaded project has the correct project CRC. This way, it can be verified that the correct application image has been transferred without data corrup­tion.

   The FB requests the CRC confirmation by applying the CRC of the downloaded application image at the q_etDiag diagnostic output.

   1. Compare the output CRC with the project CRC noted down in step 2 (taken from the 'PC' area of the 'SafePLC Info' dialog).

   2. If they match, confirm the CRC with a rising edge at the i_xCon­firmCRC function block input.

After having confirmed the project CRC, the Safety Logic Controller loads the newly downloaded safety-related program and transitions to the RUN [Safe] state.