Register description

The following registers are used for parameterization of the KM4602. Each signal channel of the analog terminal has one register that can be read or written to with the aid of control, status and data bytes via register communication.

R0: Process data for D/A-C

Process data, which are transferred to the D/A converter.

R6: Diagnostic register

The diagnostics register of the KM4602 is currently not used.

R7: Command register

The command register of the KM4602 is currently not used.

R8: Terminal description

The description of the terminal is contained in register R8.
KM4602: 0x11FA (4602_dec)

R9: Firmware version

Register R9 contains the ASCII coding of the terminal's firmware version, e.g. 0x3141 (1A_ASCII). '0x31' corresponds to the ASCII character '1' and '0x41' to the ASCII character 'A'. This value cannot be changed.

R10: Data length (multiplex shift register)

R10 contains the number of multiplexed shift registers and their length in bits.

R11: Signal channels

Unlike 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 structure (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
0x15x	Double word array with variable logical channel length
0x16	Structure: 1 byte, n double words with variable logical channel length

R15: Alignment register

Via the alignment register bits, the Bus Coupler arranges the address range of an analog terminal such that it starts at a byte boundary.

R16: Hardware version number

R17: Hardware compensation - offset (B_a)

This register is used for the offset compensation of the terminal (see equation 1.1). Register value (16 bit signed integer). Default: 0x0001 (1_dec)

R18: Hardware compensation - gain (A_a)

This register is used for the gain compensation of the terminal (see equation 1.1). Register value (16 bit unsigned integer x 2^-12). Default: typically 0x0E99 (3737_dec)

R19: Manufacturer scaling - offset (B_h)

This register contains the offset for the manufacturer scaling (see equation 1.3). Register value (16 bit signed integer). Default: 0x0000 (0_dec)
Manufacturer scaling can be activated via bit R32.1 of the feature register.

R20: Manufacturer scaling - gain (A_h)

This register contains the gain for manufacturer scaling (see equation 1.3). Register value (16 bit unsigned integer x 2^-8). Default: typically 0x0020 (32_dec)
Manufacturer scaling can be activated via bit R32.1 of the feature register.

R21: Manufacturer's switch-on value

The terminal applies the manufacturer switch-on value to its output after a system reset or a watchdog timer overflow (terminal has received no process data for 100 ms). Register value (16 bit signed integer).

R31: Code word register

If you write values into the user registers without first entering the user code word (0x1235) into the code word register, the terminal will not accept the supplied data.
If you write values into the user registers and have previously entered the user code word (0x1235) in the code word register, these values are stored in the RAM registers and in the SEEPROM registers and are therefore retained if the terminal is restarted.

The code word is reset with each restart of the terminal.

R32: Feature register

The feature register specifies the terminal's configuration. Default: 0x0006 (6_dec)

Bit	R32.15	R32.14	R32.13	R32.12	R32.11	R32.10	R32.9	R32.8
Name	-	-	-	-	-	-	-	enUserActValue

Bit	R32.7	R32.6	R32.5	R32.4	R32.3	R32.2	R32.1	R32.0
Name	-	-	enSignRepr	-	enSignAmRepr	enWdTimer	enManScal	enUsrScal

Key

Bit	Name	Description		default
R32.15	-	reserved		0_bin
...	...	...		...
R32.9	-	reserved		0_bin
R32.8	enUserActValue	0_bin	Manufacturer switch-on value active	0_bin
R32.8	enUserActValue	1_bin	User switch-on value active	0_bin
R32.7	-	reserved		0_bin
R32.6	-	reserved		0_bin
R32.5	enSignRepr	0_bin	Absolute value calculation not active	0_bin
R32.5	enSignRepr	1_bin	Absolute value calculation active	0_bin
R32.4	-	reserved		0_bin
R32.3	enSignAmRepr	0_bin	Two's complement representation is active	0_bin
R32.3	enSignAmRepr	1_bin	The arithmetic sign of numerical quantities is active (-1_dec = 0x8001)	0_bin
R32.2	enWdTimer	0_bin	Watchdog timer is not active	1_bin
R32.2	enWdTimer	1_bin	Watchdog timer is active (the watchdog is triggered if no process data are received for 100 ms)	1_bin
R32.1	enManScal	0_bin	Manufacturer scaling is active	1_bin
R32.1	enManScal	1_bin	Manufacturer scaling is not active	1_bin
R32.0	enUsrScal	0_bin	User scaling is not active	0_bin
R32.0	enUsrScal	1_bin	User scaling is active	0_bin

R33: User scaling - offset (B_w)

This register contains the offset of the user scaling.
User scaling can be activated in the feature register via bit R32.0.

R34: User scaling - gain (A_w)

This register contains the gain of the user scaling. Default: 0x0100 (256_dec)
User scaling can be activated in the feature register via bit R32.0.

R35: User's switch-on value

If the user switch-on value has been activated with bit R32.8 of the feature register, the terminal sets its output to the user switch-on value in place of the manufacturer switch-on value on the occurrence of a system reset or a watchdog timer overflow (terminal has not received any process data for 100 ms).