Register description
All registers can be read or written via register communication.
R0: Raw value A/D-C
Raw value of the A/D converter (XR)
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 KL4494 is currently not used.
R8: Terminal description
The terminal description is contained in register R8: 0x118E (4494dec)
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
Register R16 contains the hardware version of the terminal; this value cannot be changed.
R17: Hardware compensation for analog input - offset (Ba)
This register is used for the offset compensation of the analog input (see equation 1.1).
R18: Hardware compensation for analog input - gain (Aa)
This register is used for the gain compensation of the analog input.
Scaling: Gain factor = R18 x 2-12 (see equation 1.1)
Example: 4096dec (0x1000), equivalent to a gain factor of 1
R19: Hardware compensation for analog output - offset (Ba)
This register is used for the offset compensation of the analog output (see equation 1.1).
R20: Hardware compensation for analog output - gain (Aa)
This register is used for the gain compensation of the analog output.
Scaling: Gain factor = R20 x 2-15 (see equation 1.1)
Example: 32768dec (0x1000), equivalent to a gain factor of 1
R21 Overrange-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.
R22 Underrange-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).
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: 0x0404 (1028dec)
High-Byte: analog output configuration
Bit | R32.15 | R32.14 | R32.13 | R32.12 | R32.11 | R32.10 | R32.9 | R32.8 |
Name | - | - | - | enUsrDefault | enSiemens | enWDT | enManScal | enUsrScal |
Low-Byte: analog input configuration
Bit | R32.7 | R32.6 | R32.5 | R32.4 | R32.3 | R32.2 | R32.1 | R32.0 |
Name | - | - | - | - | enSiemens | enWDT | enManScal | enUsrScal |
Key
Bit | Name | Description | default | |
|---|---|---|---|---|
R32.15 | - | reserved | 0bin | |
... | ... | ... | ... | |
R32.13 | - | reserved | 0bin | |
R32.12 | enUsrDefault | 1bin | User default value specified via register R35 is active | 0bin |
R32.11 | enSiemens | 0bin | Standard output format | 0bin |
1bin | Siemens output format | |||
R32.10 | enWDT | 1bin | Watchdog timer is active | 1bin |
R32.9 | enManScal | 0bin | Manufacturer scaling is active | 0bin |
1bin | Manufacturer scaling is not active | |||
R32.8 | enUsrScal | 0bin | User scaling is not active | 0bin |
1bin | User scaling is active | |||
R32.7 | - | reserved | 0bin | |
R32.6 | - | reserved | 0bin | |
R32.5 | - | reserved | 0bin | |
R32.4 | - | reserved | 0bin | |
R32.3 | enSiemens | 0bin | Standard output format | 0bin |
1bin | Siemens output format: | |||
R32.2 | enWDT | 1bin | Watchdog timer is active | 1bin |
R32.1 | enManScal | 0bin | Manufacturer scaling is active | 0bin |
1bin | Manufacturer scaling is not active | |||
R32.0 | enUsrScal | 0bin | User scaling is not active | 0bin |
1bin | User scaling is active | |||
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).
Measured value | Bit 15 ... 3 | Bit 2 | Bit 1 | Bit 0 |
|---|---|---|---|---|
Measured value < -10 V |
| 0 | 0 | 1 |
-10 V < Measured value < 10 V | Process data | 0 | 0 | 0 |
Measured value >+10 V |
| 0 | 0 | 1 |
R33: User scaling for analog input - offset (Bw)
This register contains the offset of the user scaling for the analog input (default: 0).
User scaling for the analog input can be activated in the feature register via bit R32.0.
R34: User scaling for analog input - gain (Aw)
This register contains the gain factor of the user scaling for the analog input (default: 256dec, equivalent to a gain factor of 1).
Scaling: Gain factor = R34 x 2-8
User scaling for the analog input can be activated in the feature register via bit R32.0.
R35: User default value for analog output
Here you can specify the user default value.
R36: User scaling for analog output - offset (Bw)
This register contains the offset of the user scaling for the analog input (default: 0).
User scaling for the analog output can be activated in the feature register via bit R32.8.
R37: User scaling for analog output - gain (Aw)
This register contains the gain factor of the user scaling for the analog output (default: 256dec, equivalent to a gain factor of 1).
Scaling: Gain factor = R37 x 2-8
User scaling for the analog output can be activated in the feature register via bit R32.8.