Siemens S7-1200 System Manual page 998

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Exchanging a V3.0 CPU for a V4.0 CPU

HMI panel communication

If you had one or more HMI panels (Page 32) connected to your S7-1200 V3.0 CPU, the

communication to the S7-1200 V4.0 CPU depends on the type of communication you use

and the firmware version of the HMI panel. Recompile and download your project to the CPU

and the HMI and/or update your HMI firmware.

Requirement to recompile program blocks

After exchanging a V3.0 CPU for a V4.0 CPU, you must recompile all program blocks before

you can download them to the V4.0 CPU. Additionally, if any of the blocks have know-how

protection (Page 193) or copy protection bound to a PLC serial number (Page 195), you

must remove the protection before you compile and download the blocks. (You do not,

however, need to deactivate copy protection bound to a memory card.) After the download,

you can reconfigure the know-how protection and/or PLC serial number copy protection.

Note that if your project includes any blocks with know-how protection that an OEM (Original

Equipment Manufacturer) provided, you must contact the OEM to provide V4.0 versions of

those blocks.

In general, Siemens recommends that you recompile the hardware configuration and

software in STEP 7 and download to all devices in your project after the device exchange.

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG