Siemens SIMATIC NET PROFIBUS Manual de servicio Pagina 204

  • Descarga
  • Añadir a mis manuales
  • Imprimir
  • Pagina
    / 238
  • Tabla de contenidos
  • MARCADORES
  • Valorado. / 5. Basado en revisión del cliente
Vista de pagina 203
Description of the DP Functions, Data, and Error Codes
DP Base Programming Interface for CP 5613/CP 5614
204
C79000-G8976-C108-01
Length Bytes
Each bit in the length bytes has a special meaning.
Bit Meaning
0 to 5
Number of data units
0 (decimal) means: 1 data unit
63 (decimal) means: 64 data units
(for the length of the data units see bit 6)
6
Length
0 means: a data unit is one byte long
1 means: a data unit is two bytes long
7
Consistency
0 means: consistency over byte or word
1 means: consistency over the entire length
Example of a Special ID Format
The following table shows an example of a special ID format.
Octet Bits in the byte Meaning
1 11000011
Input/output,
3 bytes of vendor-specific data
2 1 1 0 0 1 1 1 1 Consistency, output, 16 words
3 1 1 0 0 0 1 1 1 Consistency, input, 8 words
4 to 6 Vendor-specific data
Vista de pagina 203
1 2 ... 199 200 201 202 203 204 205 206 207 208 209 ... 237 238

Comentarios a estos manuales

Sin comentarios