Programming concepts
7.7 Downloading the elements of your program
S7-1200 Programmable controller
218 System Manual, V4.2, 09/2016, A5E02486680-AK
STEP 7 and the S7-1200 prohibit a download if the connected CPU does not have the
capacity to store a download from the configured CPU; for example, you cannot download
the hardware configuration and program for the following cases:
● CPU 1215C DC/DC/DC to a CPU 1212C DC/DC/DC due to insufficient work memory
● CPU 1211C DC/DC/Relay to a CPU 1211C DC/DC/DC due to I/O differences
● CPU 1217C DC/DC/DC to any CPU 1211C, CPU 1212C, CPU 1214C, or CPU 1215C
due to the 1.5 V DC outputs in the CPU 1217C.
● CPU 1214C V4.2 to CPU 1214C V4.0, due to firmware version incompatibility
The "Load preview" dialog displays an error in such cases:
Recovering from a failed download
If the download fails, the Info tab of the Inspector Window displays the reason. The
diagnostic buffer also provides information. After a failed download, follow these steps to be
able to download successfully:
1. Correct the problem as described in the error message.
2. Reattempt the download.
In rare cases, the download succeeds but a subsequent power cycle of the CPU fails. In this
case you may see an error in the diagnostic buffer such as:
● 16# 02:4175 -- CPU error: Memory card evaluation error: Unknown or incompatible
version of CPU configuration description current card type: No memory card Function
finished/aborted, new startup inhibit set: ..- Memory card missing, wrong type, wrong
content or protected
If this occurs and additional attempts to download fail, you must clear the internal load
memory or external load memory:
1. If using internal load memory, reset the CPU to factory settings.
2. If using a SIMATIC memory card, remove it and delete the contents of the memory card
(Page 145) before reinserting.
3. Download the hardware configuration and software.
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