Register description

R0: Raw value A/D-C

Raw value of the A/D converter (X_R)

R6: Diagnostic register

The status byte is mapped to the low-order byte (bit 7 to bit 0) of register R6.
The high-order byte (bit 15 to bit 8) of register R6 is reserved.

R7: Command register

The command register of KL3404 and KL3464 is currently not used.

R8: Terminal description

Register R8 contains the terminal identifier. e.g.:

• KL3404: 0x0D4C (3404_dec)) or
• KL3464: 0x0D88 (3464_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)

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

Register R16 contains the hardware version of the terminal; this value cannot be changed.

R17: Hardware compensation - offset (Ba)

This register is used for the offset compensation of the terminal (see equation 1.1). Register value (16 bit signed integer) 0x0000 (0_dec)

R18: Hardware compensation - gain (Aa)

This register is used for the gain compensation of the terminal (see equation 1.1). Register value (16 bit signed integer x 2^-12):

• KL3404: approx. 0x135A (4954_dec)
• KL3464: approx. 0x13A6 (5030_dec)

R19: Manufacturer scaling - offset (Bh)

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

R20: Manufacturer scaling - gain (Ah)

This register contains the gain for manufacturer scaling (see equation 1.3). Register value (16 bit signed integer x 2^-10): typically 0x2000 (8192_dec)
Manufacturer scaling can be enabled via bit R32.1 of the feature register.

R21: Over-range limit - OvRL (Ya)

This limit value limits the maximum measuring range of the input terminal (see equation 1.0). If it is exceeded, the associated status bit is set, and the maximum value is displayed. Register value (16 bit signed integer)

• KL3404: 0x07FF (2047_dec)
• KL3464: 0x0FFF (4095_dec)

R22: Under-range limit - UnRL (Ya)

If the value falls below this limit, the associated status bit is set, and the minimum value is displayed (see equation 1.0). Register value (16 bit signed integer)

• KL3404: 0xF800 (63488_dec)
• KL3464: 0x0000 (0_dec)

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: 0x0906 (2310_dec)

Key

Siemens output format

If the Siemens output format is selected, the lowest three bits are used for status evaluation. The process data is represented in bits 15 to 3, with bit 15 representing the sign bit. Scaling of the measured value according to the Siemens standard has to be done via user scaling (R33, R34).

R33: User scaling - offset (Bw) *

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

*) Not supported by KL3404, KL3408, KL3464 and KL3468.

R34: User scaling - gain (Aw)

This register contains the user scaling gain; 0x0400 (1024_dec) corresponds to 1.
User scaling can be enabled in the feature register via bit R32.0.

R35: Threshold 1 in Y2

If the process data are outside this threshold, the appropriate bits are set in the status byte.

R36: Threshold 2 in Y2

If the process data are outside this threshold, the appropriate bits are set in the status byte.

R37: Cut-off frequency of the digital IIR filter

This register determines the cut-off frequency of the digital IIR filter (first order). The IIR filter can be disabled in the feature register with bit R32.11.