Siemens S7-1200 System Manual page 809
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Also See for S7-1200:
- Operating instructions manual (132 pages) ,
- Programming manualline (74 pages) ,
- Manual (46 pages)
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To enable this function for an online project with a CPU in RUN mode, follow these steps:
1. From the Program blocks folder in the STEP 7 project tree, open the block.
2. Click the "Download without reinitialization" toggle button in the block editor to enable the
3. Click OK on the prompt to confirm your choice.
4. Add tags to the block interface and download the block in RUN mode. You can add and
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
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
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
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
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.
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
function. (The icon has a box around it when you have enabled it:
download as many new tags as your memory reserve allows.
function. (The icon does not have a box around it when you have disabled it:
download the extended block.
"Properties" from the context menu.
mode. You can add and download as many new retentive data block tags as your
retentive memory reserve allows.
Online and diagnostic tools
14.12 Downloading in RUN mode
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