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If your only use of Siemens PLCs are an S7-300, C7 or ET200 in a stand alone application with no special needs (CP or FM) then I could highly recommend the Lite package. On the other hand, the current availability of a free download of the SIMATIC Step 7 Lite software makes it awfully tempting to take a look at it. So there are quite a few major limitations with the Step 7 Lite software which may end your further reading of this review. If you’re interested in more details then refer to our chart of differences between the Step 7 program packages. No communication processors (CP) or function modules (FM) supported.No support for multi-projects or HMI integration.Remote I/O racks (IM modules) are supported but there’s nothing for Profibus DP even if you have a DP port on your CPU. So no programming for the S7-200 or S7-400 PLC series. ![]() Support limited to the SIMATIC S7-300 PLC, the C7 all-in-one PLC and HMI, and the intelligent CPUs of the ET200 distributed I/O family.The four major limitations in STEP 7 Lite verses the more advanced STEP 7 package are: ![]() Depending on your needs this may not be the case with the Siemens STEP 7 Lite package. ![]() ![]() When one hears the words “Lite†and software you tend to think of software that’s not really usable.
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