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--- devices_plcs [2021/01/13 11:11]
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+++ devices_plcs [2021/01/31 23:32] (current)
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 https://www.tanindustrie.de/fr/Help/ConfigClient/tsap_s7.htm
+**S7 Addressing**
+S7 (and S5) PLCs have the following address structure.
+Supported memory types are: I,E,Q,A,M,F,DB,T,C & Z
+Supported data types are: X,B,W,I,D,R,S - Boolean, Byte, Word, Int (signed word), Double Word, Real and String
+Scalar types can have bit numbers added, so, for example, DB8:D80.11 and MW11.1 are valid addresses.  For String types, the length is provided. For example, DB8:S20.50 will read a string of 50 byte starting from DB8 offset 20.  By defaults, strings are read and written in the Siemens format with the first character being the maximum length and the second character being the current length.  Setting the "Null Terminated" flag will cause strings to be read and written as raw characters ending with a nul (\0).
+Further register examples:
+<code>
+DB8:S86.50
+DB8:D80.11
+DB8:I80.11
+DB8:R2
+DB8:D8
+DB8:D8.2
+DB8:S20.50
+DB8:I0.2
+DB8:I80
+DB8:W80.11
+DB8:W0.2
+DB8:W80
+DB8:X0.2
+DB8:X6.11
+DB8:X6.2
+MS11.7
+FB2
+QI21
+AI21
+AW21
+MW11.0
+MW11
+MX10.7
+T0
+T0.4
+C1
+C1.4
+</code>
+**S7 Arrays**
+An S7 Array is configured with the size (Register Count) and starting register (Start Register), and the data type of the array is taken from the address designation. In the example
+{{:pasted:20210131-232432.png?400}}
+The data type is "B" in the starting address DB195:B0, and the number of elements in the array is 6. This means that the S7Array will read 6 byte registers starting at DB195:B0, so DB195:B0,DB195:B1,DB195:B2,DB195:B3,DB195:B4,and DB195:B5. If the Start Register was set to read words, such as DB195:W8, and the array size was set to 3, DB195:W8,DB195:W9,and DB195:W10 would be returned in the array.