Siemens AC75 Manuel D’Utilisation

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AC75_ATC_V01.002

Page 505 of 569

10/30/06

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The following examples shall illustrate the message structure and write/read procedures explained in Section

. Blanks are inserted only to better visualize frame elements. In prac-

tice no blanks are allowed. 

<0 00 0000 11 22 33>

Transfer Message: The master writes 3 bytes. 

{0 +}

Response Message: Transmission successful.

<1 00 0010>

Transfer Message: The master requests to read 16

bytes from the slave. Read Offset is zero, therefore,

reading starts from the first byte.

{1 + 11 22 33 44 ... FF 00}

Response Message: Reading data successful.

<2 03 0008>

Transfer Message: The master requests to read 8

bytes from the slave. Read Offset is 3, therefore,

reading starts from the fourth byte.

{2 + 44 55 66 77 88 99 AA BB}

Response Message: Reading data successful.

<3 03 0004 11 22 33 44 55 66>

Transfer Message: The master writes 6 bytes and

requests to read 4 bytes from the slave. Read Offset

is 3, therefore, reading starts from the fourth byte.

{3 + AA BB CC DD}

Response Message: Reading and writing data suc-

cessful.