BECKHOFF BK3000 - Manual (Page 43)

Appendix
BK3xxx/LC3100 43
sequence of the terminals in the output or input data can be freely
programmed.
The terminal bus cycle can be started cyclically (updating of the process
image: free running) or synchronously with reception of the DP
Data_Exchange telegram (updating of the process image: synchronous
with the cycle).
The reaction to a PROFIBUS error (the plug is pulled out, the DP master
enters STOP, etc.) can be set. The possible reactions are that the terminal
bus is stopped, the outputs are set to 0 or that the old outputs are sent onto
the terminal bus.
It is also possible to set a reaction to a terminal bus error. The possible
reactions are abortion of the DP data exchange, setting the inputs to 0 or
sending the old inputs onto the PROFIBUS.
The terminal bus settings are found in bytes 9 and 10 of the
User_Prm_Data (the default settings are printed bold):
Bit no. Description is supported by
Byte 9
Bit 1 Configuration type
0: Programmed configuration
1: Auto-configuration BK3000 / BK3100
Byte 9
Bit 3 Auto-configuration data format
0: INTEL
1: MOTOROLA BK3000 / BK3100 / BK3500
Byte 9
Bit 6 Updating of the process image
0: synchronous with cycle
1: free running BK3100/BK3x10/BK3500/LC3100
Byte 10
Bit 0/1 Reaction to PROFIBUS error
0: K bus cycle stopped
1: K bus outputs set to 0
2: K bus outputs remain
unchanged All BK3xx0 / LC3100
Byte 10
Bit 2/3 Reaction to terminal bus error
0: Data exchange is aborted
1: DP inputs set to 0
2: DP inputs remain unchanged All BK3xx0 / LC3100
2 byte PLC interface/
2 byte diagnostic interface Registers in the complex terminals and bus coupler registers can both be
read or written using the 2 byte PLC interface. The complex terminal
registers are described in the associated terminal documentation. The bus
coupler registers can be used, for example, to read terminal bus
diagnostics data, the terminal composition or the cycle times, and the
programmed configuration can be written. It is also possible for a manual
terminal bus reset to be carried out. The 2 byte PLC interface needs 2
bytes both in the output data and in the input data, and a special protocol is
used with them (the two bytes are always located at the start of the output
or input data). A description of the 2 byte PLC interface, the registers
available in the bus couplers and of function blocks for various PLCs that
implement the 2 byte PLC interface can be supplied on request.
The terminal’s error messages can also be sent via the 2 byte diagnostic
interface as an alternative to transmission with the DP diagnostic data.
Terminal bus diagnostics must however be activated for this purpose. The
2 byte diagnostic interface occupies two bytes in the output data and two in
the input data, and a protocol is used with them (the two bytes are always
located at the start of the output or input data behind the 2 byte PLC
interface (if that is switched on)). A description of the 2 byte-diagnostic
interface can be supplied on request.