Program Compatibility Between Firmware Versions

hi Vannahsman,

It depends on the instructions you are using.

If you use instructions or versions of instructions that are only available to the newer Firmware, you need to change the program.

have a look into the manual what changed.

SIMATIC S7 S7-1200 Programmable controller

regards,

 

Note

No device exchange possible from V4.1.2 to V3.0

You can exchange a V3.0 CPU for a V4.1.2 CPU, but you cannot exchange a V4.1.2 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

device exchange.

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 V4.1.2.