Beckhoff KL5101, Documentation, Page: 29 / 40

Access from the user program
KL5101 29 Version: 3.1
5.3 Register overview
Address Designation Default value R/W Storage medium
R0…R5 reserved 0x0000 R
R6 Diagnostic register not used 0x0000 R
R7 Command register not used 0x0000 R
R8 Terminal type 5101 R ROM
R9 Firmware version 0x???? R ROM
R10 Multiplex shift register 0x0218/0130 R ROM
R11 Signal channels 0x0130 R ROM
R12 Minimum data length 0x03030 R ROM
R13 Data structure 0x0000 R ROM
R14 reserved 0x0000 R
R15 Alignment register variable R/W RAM
R16 Hardware version number 0x???? R/W SEEROM
R17…R30 reserved 0x0000 R/W SEEROM
R31 Code word register variable R/W RAM
R32 Feature register 0x2200 R/W SEEROM
R33…R61 reserved 0x0000 R/W SEEROM
5.4 Register description
The registers can be read or written via the register communication. They are used for the parameterization
of the terminal.
R0 to R7: Registers in the internal RAM of the terminal
The process variables can be used in addition to the actual process image. Their function is specific to the
terminal.
• R0 to R5: reserved
• R6: Diagnostic register
The diagnostic register can contain additional diagnostic information. Parity errors, for instance, that
occur in serial interface terminals during data transmission are indicated here.
• R7: Command register
High-Byte_Write = function parameter
Low-Byte_Write = function number
High-Byte_Read = function result
Low-Byte_Read = function number
R8 to R15: Registers in the internal ROM of the terminal
The type and system parameters are hard programmed by the manufacturer, and the user can read them
but cannot change them.
• R8: Terminal type
The terminal type in register R8 is needed to identify the terminal.
• R9: Software version (X.y)
The software version can be read as a string of ASCII characters.
• R10: Data length
R10 contains the number of multiplexed shift registers and their length in bits.
The Bus Coupler sees this structure.
• R11: Signal channels
Related to R10, this contains the number of channels that are logically present. Thus for example a
shift register that is physically present can perfectly well consist of several signal channels.