Bus Coupler Versions In Multi-Configuration Mode - Beckhoff BK3 0 Series Documentation

Exceeding the configuration data length (CfgData)
By default, a maximum of 64 bytes of configuration data is set on the Bus Coupler. Normally, this is only a
problem in very rare cases. In multi-configuration mode, however, this limit is reached with no more than a
30 digital terminals, because each KLxxxx MultiCfgMode module occupies two bytes in the configuration
data, on top of which there is at least one sum byte for digital inputs or for digital outputs.
The maximum lengths of the DP buffers can be changed, although the amount by which a length is
increased has to be subtracted from another, and the sizes must only be modified in 8-byte steps:
Maximum DP buffer sizes
DP buffer
Inputs
Outputs
Diagnostic data
Configuration data
Setting via the 2-BYTE PLC interface or KS2000
The maximum DP buffer sizes can be modified in Table 100, although it is necessary for the Bus Coupler to
be reset (power off/power on, or a software reset) before the new value is adopted:
Register
2
3
4
5
Setting via UserPrmData
The Bus Coupler's reset is carried out automatically if the DP buffers are set using UserPrmData [} 35]:
Byte Bit
12 4-7
37 0-7
38 0-7
39 0-7
40 0-7
Example 1: Not enough configuration data
128 bytes input
128 bytes output
80 bytes CfgData
48 bytes diagnosis data
Example 2: Not enough input data
160 bytes input
96 bytes output
64 bytes CfgData
64 bytes diagnosis data
7.6

Bus Coupler versions in multi-configuration mode

Structure of a production machine
Production machines often consist of a machine part that is always present in the machine and of machine
extensions that may be added as options. This division also usually applies as well both to the software (the
control program) and to the hardware (the necessary process signals via Beckhoff Bus Terminals)
BK3xx0
Maximum sizes under default settings
128 bytes
128 bytes
64 bytes
64 bytes
Description
maximum length of input data
maximum length of output data
maximum length of diagnosis data
maximum length of configuration data
Description
15 dec or 0xF hex: the maximum DP buffer lengths are changed using the values
from UserPrmData 37-40
maximum length of input data
maximum length of output data
maximum length of diagnosis data
maximum length of configuration data
Version: 4.3.0
Extended functions
77