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15.14 Downloading in RUN mode
S7-1200 Programmable controller
1342 System Manual, V4.2, 09/2016, A5E02486680-AK
If you have added more bytes to your block than you have configured for the memory
reserve, STEP 7 displays an error when you attempt to download the block in RUN mode.
You must edit the block properties to increase the amount. You cannot delete existing
entries or modify the “Memory reserve” of the block while the “Download without
reinitialization” function is enabled. To disable the "Download without reinitialization"
function, follow these steps:
1. Click the "Download without reinitialization" toggle button in the block editor to disable the
function. (The icon does not have a box around it when you have disabled it:
)
2. Click OK on the prompt to confirm your choice.
3. Download the block. On the download dialog, you must select "reinitialize" in order to
download the extended block.
The download then reinitializes all existing and new block tags to their start values.
Downloading retentive block tags
Downloading retentive block tags in RUN mode requires the allocation of a retentive memory
reserve. To configure this retentive memory reserve, follow these steps:
1. From the Program blocks folder in the STEP 7 project tree, right-click the block and select
"Properties" from the context menu.
2. Select the "Download without reinitialization" property.
3. Select the check box for "Enable download without reinitialization for retentive tags".
4. Configure the number of bytes available for the retentive memory reserve.
5. Click OK to save your changes.
6. Add retentive data block tags to the data block and download the data block in RUN
mode. You can add and download as many new retentive data block tags as your
retentive memory reserve allows.
If you have added more retentive bytes to your data block than you have configured for the
retentive memory reserve, STEP 7 displays an error when you attempt to download the
block in RUN mode. You can only add retentive block tags up to the retentive memory
reserve in order to be able to download them in RUN mode.
When you download the extended retentive block tags, the tags contain their current values.
Configuring amount of reserved memory for new blocks
The default memory reserve size for new data blocks is 100 bytes. When you create a new
block, it has 100 bytes available in reserve. If you want the memory reserve size to be
different for new blocks, you can change the setting in the PLC programming settings:
1. From STEP 7, select the
menu command.
2. From the Settings dialog, expand "PLC programming" and select "General".
3. In the "Download without reinitialization" section, enter the number of bytes for the
memory reserve.
When you create new blocks, STEP 7 uses the memory reserve configuration that you
entered for the new blocks.
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