Siemens SIMATIC S7-1200 System Manual page 1572
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Also See for SIMATIC S7-1200:
- Function manual (527 pages) ,
- Manual (364 pages) ,
- System manual (338 pages)
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Device exchange and spare parts compatibility
D.1 Exchanging a V3.0 CPU for a V4.2 CPU
You need to be aware of some configuration and operational changes between the two CPU
versions:
Upgrading STEP 7 projects
You cannot upgrade STEP 7 V11 or V12 projects directly to STEP 7 V14. You must first
upgrade these projects to STEP 7 V13 SP1 and then use that project as a basis for upgrade
to STEP 7 V14.
Risks with copying and pasting program logic from older versions of STEP 7
Copying program logic from an older version of STEP 7 such as STEP 7 V12 into STEP 7
V14 can cause unpredictable behavior in program execution or failures to compile. Different
versions of STEP 7 implement program elements differently. The compiler does not always
detect the differences if you made the changes by pasting from an older version into
STEP 7 V14. Executing unpredictable program logic could result in death or severe
personal injury if you do not correct the program.
When using program logic from a release of STEP 7 earlier than STEP 7 V14, always
upgrade the entire project to STEP 7 14. Then you can copy, cut, paste, and edit program
logic as necessary. In STEP 7 V14, you can open a project from STEP 7 V13 SP1 or later.
STEP 7 then performs the necessary compatibility conversions and upgrades the program
correctly. Such upgrade conversions and corrections are necessary for proper program
compilation and execution. If your project is older than STEP 7 V13 SP1, you must upgrade
the project incrementally to STEP 7 V14.
Organization blocks
With V4.2, you can configure OB execution to be interruptible or non-interruptible
(Page 105). For projects from former V3.0 CPUs, STEP 7 sets all OBs by default to be non-
interruptible.
STEP 7 sets all OB priorities (Page 105) to the values they were in the V3.0 CPU STEP 7
project.
You can subsequently change the interruptability or priority settings if you choose.
The Diagnostic error interrupt OB (Page 97) start information references the submodule as a
whole if no diagnostics event is pending.
1572
WARNING
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
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