S7-200 is programmable logic controllers of Siemens (Germany), has the structure typemodule and the module extensions. This module is used with different purposes. The full text of the program are saved in the memory of the PLC, in which case the memory capacity is not enough we can use external memory for storing programs and data (cartridge rotating). PLC series S7-200 has two 21X (old type) and 22 x (new type) 21X, in which they no longer produce anymore. They had 21X the eternal follows: 210, 212, 214, 215-2DP, 216; they have 22 x hereafter: 221, 222, 224, 226, 224XP, 226XM
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