User`s manual

GFK-2334A Chapter 4 PROFIBUS Slave CPU Configuration 4-3
4
DP-V1 Class 1 Buffer
Length
The length of the data buffer in the PROFIBUS chip for Class 1 DP-V1 messages. This
includes the length of the header buffer, which is set to 4 bytes.
Note: This value impacts the available data width for the cyclic I/O data.
Valid range: 0 through 244 bytes.
PROFIBUS memory allocations for cyclic I/O data, the DP-V1 Class 1 Buffer Length, and
the DP-V1 Class 2 Buffer Length conform to the following formulas:
Cyclic I/O data only: 3 (Ir + Qr) must be less than or equal to 1192.
Cyclic I/O data and Class 1 buffer: 3 (Ir + Qr) + B1r must be less than or equal to
1192.
Cyclic I/O data and Class 2 buffer: 3 (Ir + Qr) + B2r must be less than or equal to
1160.
Cyclic I/O data and Class 1 and Class 2 buffers: 3 (Ir + Qr) + B1r + B2r must be less
than or equal to 1152.
The above formulas use the following acronyms:
B1r: (4 + DP-V1 Class 1 Buffer Length), rounded up to a multiple of 8
B2r: (4 + DP-V1 Class 2 Buffer Length), rounded up to a multiple of 8
Ir: length of input data, rounded up to multiple of 8
Qr: length of output data, rounded up to multiple of 8
Note: The 4 additional bytes in B1r and B2r indicate SPC3 internal administration data.
DP-V1 Class 2 Buffer
Length
The length of the data buffer in the PROFIBUS chip for Class 2 DP-V1 messages. This
includes the length of the header buffer, which is set to 4 bytes.
Note: This value impacts the available data width for the cyclic I/O data.
Valid range: 0 through 244 bytes.
PROFIBUS memory allocations for cyclic I/O data, the DP-V1 Class 1 Buffer Length, and
the DP-V1 Class 2 Buffer Length conform to the formulas given under the DP-V1 Class 1
Buffer Length parameter.
DPV1 Read Indication
DP-V1 Status Register 1 DP-V1 Status Register 2
Bit 15 Bit 14—8 Bit 7—0 Bit 15—8 Bit 7—0
0 Master Address Data Size Slot Index
DPV1 Write Indication
DP-V1 Status Register 1 DP-V1 Status Register 2
Bit 15 Bit 14—8 Bit 7—0 Bit 15—8 Bit 7—0
1 Master Address Data Size Slot Index