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.

R12: Minimum data length
The particular byte contains the minimum data length for a channel that is to be transferred. If the MSB is set, the control and status byte is not necessarily required for the terminal function and is not transferred to the control, if the Bus Coupler is configured accordingly.

R13: Data type register

Data type register	Meaning
0x00	Terminal with no valid data type
0x01	Byte array
0x02	Structure 1 byte n bytes
0x03	Word array
0x04	Structure 1 byte n words
0x05	Double word array
0x06	Structure 1 byte n double words
0x07	Structure 1 byte 1 double word
0x08	Structure 1 byte 1 double word
0x11	Byte array with variable logical channel length
0x12	Structure 1 byte n bytes with variable logical channel length (e.g. 60xx)
0x13	Word array with variable logical channel length
0x14	Structure 1 byte n words with variable logical channel length
0x15	Double word array with variable logical channel length
0x16	Structure 1 byte n double words with variable logical channel length

R14: reserved

R15: Alignment bits (RAM)
The alignment bits are used to place the analog terminal in the Bus Coupler on a byte boundary.

R16 to R30: Manufacturer parameter area (SEEROM)

The manufacturer parameters are specific for each type of terminal. They are programmed by the manufacturer, but can also be modified by the controller. The manufacturer parameters are stored in a serial EEPROM in the terminal, and are retained in the event of voltage drop-out.

These registers can only be altered after a code word has been set in R31.

R31 to R47: User parameter area (SEEROM)

The user parameters are specific for each type of terminal. They can be modified by the programmer. The user parameters are stored in a serial EEPROM in the terminal, and are retained in the event of voltage drop-out. The user area is write-protected by a code word.

• R31: Code word register in RAM

The code word 0x1235 must be entered here so that parameters in the user area can be modified. If any other value is entered into this register, the write-protection is active. When write protection is not active, the code word is returned when the register is read. If the write protection is active, the register contains a zero value.

R32: Feature register
[0x0007]
This register specifies the operation modes of the terminal.

Feature bit no.		Description of the operation mode
Bit 0	0/1	0: Binary output 1: Gray binary conversion [default] The numbers are output as binary numbers.
Bit 1	0/1	0: Standard output format 1: Alternative output format [default].
Bit 2	0/1	0: free running 1: Synchronous operating mode [default] The data are loaded in synchronization with the reading cycle of the K-bus.
Bit 3	0/1	0: Multi-turn evaluation of the encoder [default], max. 25 bits 1: Multi-turn evaluation of the encoder, max. 13 bits
Bit 4	0/1	0: enable frame error [default] 1: disable Frame Error: After the last valid bit, no check is carried out as to whether the data line supplies a zero signal.
Bit 5*	0/1	Some SSI encoders indicate the status of their supply voltage with the Power Failure Bit (PFB). 0: Power Failure not displayed [default] 1: Power Failure displayed: Bit 2 of the status byte of the KL5001 indicates the last-transmitted state of the PFB.
Bit 6*	0/1	0: variable data frame disabled [default] 1 variable data frame enabled The data frame length is specified in R35 and is limited to 2 to 32 bits.
Bit 7…15	-	Reserved, don't change

*) from hardware version 09 and firmware version 4A

R33: Baud rate
[0x0002]
The baud rate for the reading of the SSI encoder is selected using this register.

High byte = not used

Low byte	Baud rate
1	1 MHz
2	250 kHz [default]
3	125 kHz
4	100 kHz
5	83 kHz
6	71 kHz
7	62,5 kHz

R34: Data length
[0x18]
The data length that appears in the process image can be set with this register.
The permissible value range is: 0 to 32 bits
HB = not used
Low byte = 0 - 32 bits in hexadecimal representation.

R35*: Variable frame length
The data frame length can be set with register R35 if bit R32.6 is set in the feature register (R32). The data frame length should be ≥ the data length (R34), as otherwise a FRAME_E is generated in the status byte.
*) from hardware version 09 and firmware version 4A