Siemens Memory Specifications download pdf (Page 52)

3 General Programming

3.6 Symbolic addressing

Programming Guideline for S7-1200/1500

V1.2, Entry ID: 81318674

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Note

You will find further information in the following entries:

How do you initialize structures into optimized memory areas for the S7-1500

STEP 7 (TIA Portal)?

http://support.automation.siemens.com/WW/view/en/78678761

How do you create a PLC data type for an S7-1500 controller?

http://support.automation.siemens.com/WW/view/en/67599090

In STEP 7 (TIA Portal) V12, how do you apply your own data types (UDT)?

http://support.automation.siemens.com/WW/view/en/67582844

Why should whole structures instead of many single components be transferred

for the S7-1500 when a block is called?

http://support.automation.siemens.com/WW/view/en/67585079

3.6.4 Access to I/O areas with PLC data types

With S7-1500 controllers, you can create PLC data types and use them for

structured access to inputs and outputs.

Figure 3-29: Access to I/O areas with PLC data types

PLC data type

PLC tag

FB call

FB interface

1. PLC data type with all required data

2. PLC tag of the type of the created PLC data type and start address of the I/O

data area (%Ix.0 or %Qx.0, e.g., %I0.0, %Q12.0, …)

3. Transfer of the PLC tag as actual parameter to the function block

4. Input of the function block is of the type of the created PLC data type

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Siemens Memory Specifications Page 52