S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
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Device exchange and spare parts compatibility
Exchanging a V3.0 CPU for a V4.2 CPU
To upgrade a V3.0 CPU to a V4.2 CPU, you must replace the CPU hardware. You cannot
upgrade a V3.0 CPU to a V4.2 CPU by firmware update.
Then in your STEP 7 project, you can replace your V3.0 CPU with a V4.2 CPU (Page 170)
and use your existing STEP 7 project that you designed for the V3.0 CPU.
When you replace a V3.0 CPU with a V4.2 CPU, you might also want to check for and apply
firmware updates (Page 148) to your connected signal and communication modules.
Note
No device exchange possible in STEP 7 from V4.2 to V3.0
You can exchange a V3.0 CPU for a V4.2 CPU, but you cannot exchange a V4.2 CPU for a
V3.0 CPU after you download the configuration. If you want to view or otherwise use your
existing STEP
7 V3.0 project, make an archive of your STEP 7 V3.0 project prior to the
Note that if you have not downloaded the exchanged device configuration, you can undo it.
After downloading, however, you cannot undo the exchange from V3.0 to V4.2.
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