Dpv1 - Acyclic Data Transfer; Dpv1 Interface - Beckhoff BK3 0 Series Documentation

PROFIBUS DP communication
Byte
3
It is also necessary for the dummy output byte to be configured in the CfgData before the complex terminals:
CfgData
0x20
K-bus cycle counter
In order for the master to be able to check reliably whether precisely one (or two) K-bus cycles are always
being carried out during one DP cycle, a K-bus cycle counter can be transferred in the input data from the
Bus Coupler to the master. This is incremented after each K-bus cycle (0 is omitted, so that 1 follows after
255). The K-bus cycle counter must be activated in the UserPrmData and entered as a module in the
CfgData. The extended GSD file for the Bus Coupler is, however, necessary for this:
Byte
3
It is also necessary for the K-bus cycle counter byte to be configured in the CfgData before the complex
terminals:
CfgData
0x10
5.2

DPV1 - acyclic data transfer

5.2.1

DPV1 Interface

By default, one MSAC_C1 connection and one MSAC_C2 connection with 52 bytes of data (4 bytes DPV1
header plus 48 bytes of user data) are supported. The MSAC_C1 connection is established along with cyclic
connection, and can be activated via the UserPrmData [} 35]:
Byte Bit Value: Description
0 7 1: MSAC_C1 connection is activated
The MSAC_C2 connection can be used either by the C1 master (which communicates with the slave
cyclically) or by a C2 master (which then only communicates with the slave acyclically), and has its own
establishment of connection. The parameters at the establishment of the MSAC_C2 connection
(Feature_Supported, Profile_Feature_Supported, Profile_Ident_Number, etc.) are not examined, and the
parameters of the request are mirrored in the response.
Slot_Number [} 57] = 0 addresses PROFIBUS coupler data, Slot_Number [} 57] > 0 addresses the data of
the function module(s).
56
Bit
5
Bit
3
Version: 4.3.0
Value
1
bin
DP modules
Dummy output byte
Value
1
bin
DP modules
K-bus cycle counter
Description
Dummy output byte
activated
Description
K-bus cycle counter
activated
BK3xx0