Technical data

Creating Blocks and Libraries
9.3 Creating Blocks
Programming with STEP 7
230 Manual, 05/2010, A5E02789666-01
9.3.4 Displaying Block Lengths
Block lengths are displayed in "bytes."
Display in the Block Folder Properties
The following lengths are displayed in the block folder properties in the offline view:
• Size (sum of all blocks without system data) in the load memory of the programmable controller
• Size (sum of all blocks without system data) in the work memory of the programmable
controller
• Block lengths on the programming device (PG/PC) are not displayed in the block folder
properties.
Display in the Block Properties
The following are displayed in the block properties:
• Required number of local data: size of the local data in bytes
• MC7: size of the MC7 code in bytes, or size of the DB user data
• Size of the load memory in the programmable controller
• Size of the work memory in the programmable controller: only displayed if hardware
assignment is recognized.
For display purposes, it does not matter whether the block is located in the window of an online
view or an offline view.
Display in the SIMATIC Manager (Details View)
If a block folder is opened and the "Details View" selected, the work memory requirement is
displayed in the project window, irrespective of whether the block folder is located in the window of
an online view or an offline view.
You can calculate the sum of the block lengths by selecting all the relevant blocks. In this case, the
sum of the selected blocks is displayed in the status bar of the SIMATIC Manager.
No lengths are displayed for blocks which cannot be downloaded to the programmable controller
(for example, variable tables).
Block lengths on the programming device (PG/PC) are not displayed in the Details view.