simens small size plc

Siemens have many PLC's within their range.
The older S5 and the newer S7.

Within each range there are several models.
The small S7 range is called S7-200

The S5 had S5-90;95 and 100 models.

Stick with the S7-200 models, they are newer.
 
Beware: stepping up from S7-200 to S7-300/400 is not easy. The S7-200 is in fact a descendant from the TI PLC's, whereas the S7-300/400 are "real" Siemens PLC's.

The S5-90/95/100 families are also real Siemens PLC's, but these are out-of-date.

So, stick to the suggestion by Moggie and count on having to learn again when stepping up to the bigger S7's.
 

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