Register description
The registers are used for parameterizing the Bus Terminals and are once available for each channel. They can be read or written by means of register communication.
Basic configuration is also possible via the PLC using the function blocks FB_KL3208Config (TwinCAT2, TwinCAT3) and FB_KL3228Config (TwinCAT2, TwinCAT3).
R0: A/D converter, raw value
Register R0 contains the raw value of the analog/digital converter. This is the unchanged analog value prior to any scaling.
R1: A/D converter, raw value of the line
Register R1 contains the raw value of the line resistance between +R1 – RL1 or between +R2 – RL2.
R6: Diagnostic register
The status byte SBn of Channel n is shown in the low byte of register R6.
R7: Command register
The command register of KL3228 is currently not used.
R8: Terminal description
The terminal identifier is contained in register R8:
- KL3208-0010: 0x0C88 (3208dec)
- KL3228-0000: 0x0C9C (3228dec)
R9: Firmware version
Register R9 contains the ASCII coding of the terminal's firmware version, e.g. 0x3141 = '1A'. The '0x31' corresponds here to the ASCII character '1', while the '0x41' represents the ASCII character 'A'.
This value cannot be changed.
R12: Minimum data length of a channel
Bits 0 to 6 of the high-order byte specify the minimum number of output data in bits: 000.0000bin = 0dec, hence 0 bytes.
Bits 0 to 6 of the low-order byte specify the minimum number of input data in bits: 001.1000bin = 24dec, hence 3 bytes.
The fact that bit 7 is set indicates that the control and status byte are not mandatory for the terminal function and are not transferred in compact mode.
R16: Hardware version number
Register R16 contains the hardware version of the terminal.
R17: Vendor calibration – offset
This register contains the offset of the vendor calibration.
R18: Vendor calibration – gain
This register contains the gain of the vendor calibration.
R19: Manufacturer scaling - offset
This register contains the offset of the manufacturer scaling. It can be activated by R32.1 in the feature register.
R20: Manufacturer scaling - gain
This register contains the gain of the manufacturer scaling. It can be activated by R32.1 in the feature register.
R21: Offset register for two-wire connection
The value of register 1 at short circuit +R1-RL1 or +R2-RL2
R23: Reference calibration value: Offset
This register contains the reference value of the calibration, which is determined during the vendor calibration.
R24: Reference calibration value: Gain
This register contains the reference value of the calibration, which is determined during the vendor calibration.
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 if the terminal is restarted.
R32: Feature register
The feature register specifies the terminal's operation mode.
Bit | R32.15 | R32.14 | R32.13 | R32.12 | R32.11 | R32.10 | R32.9 | R32.8 |
Name | SensorType | disChannel | - | - | - | |||
Bit | R32.7 | R32.6 | R32.5 | R32.4 | R32.3 | R32.2 | R32.1 | R32.0 |
Name | - | - | Resolution | - | - | disWdTimer | enManScal | enUsrScal |
Key
Bit | Name | Description | default | |
|---|---|---|---|---|
R32.15...R32.12 | SensorType | 0000bin | PT1000 | 0bin |
0001bin | NI1000 | |||
0010bin | RSNI1000 (note: different characteristic curve, similar to NI1000, but with 1000 Ω at 0 °C and 1500 Ω at 100 °C) | |||
R32.11 | disChannel | 0bin | Channel switched on | 0bin |
1bin | Channel switched off | |||
R32.10… R32.6 | - | reserved | 0bin | |
R32.5 | Resolution | R32.5=1: high resolution 1/100°C (default for KL3208-0010) R32.5=0: standard resolution 1/10°C | 0/1 | |
R32.3/4 | - | reserved | 0bin | |
R32.2 | DisWdTimer | Disable Watchdog Timer | 0bin | |
R32.1 | enManScal | 0bin | Manufacturer scaling is not active | 0bin |
1bin | Manufacturer scaling is active | |||
R32.0 | enUsrScal | 0bin | User scaling is not active | 0bin |
1bin | User scaling is active | |||
R33: User scaling – offset
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
This register contains the gain of the user scaling. User scaling can be activated in the feature register via bit R32.0.
R37: Filter constant of the A/D converter
Value in R37 | First Notch | Conversion time |
|---|---|---|
0x0000 | 25 Hz | 250 ms |
0x0050 | 100 Hz | 65 ms |
0x00A0 | 50 Hz | 125 ms |
0x0140 | 25 Hz | 250 ms |
0x0280 | 12.5 Hz | 500 ms |
R39: Further elements
Register R39 is supported by KL3208-0010 from firmware version 1C and hardware version 01 (Default: 0dec)
 | Setting R39 increases the conversion time to one second per channel As soon as register R39 is not equal to 0 for one channel of the terminal, the conversion time for all channels is increased to about 1 second per channel, automatically and irrespective of the sensor type, in order to optimize the measuring accuracy. The conversion time for all channels can be commonly set via register R40 of channel 1. A reduction is not recommended due to loss of accuracy. |
Value in R39 | Element | Measuring range | R at 25°C | R at 0°C | |
|---|---|---|---|---|---|
0x0032 | 50dec | NCT1K8 | -40°C ... 130°C | 1.8 kΩ | 4940 Ω |
0x0033 | 51dec | NCT1K8_TK | -30°C ... 150°C | 1.8 kΩ | 5200 Ω |
0x0034 | 52dec | NCT2K2 | -50°C ... 130°C | 2.2 kΩ | 7373 Ω |
0x0035 | 53dec | NCT3K | -50°C ... 80°C | 3.0 kΩ | 9822 Ω |
0x0036 | 54dec | NCT5K | -40°C ... 100°C | 5.0 kΩ | 16325 Ω |
0x0037 | 55dec | NTC10K | -30°C ... 150°C | 10 kΩ | 32650 Ω |
0x0038 | 56dec | NTC10KPRE | -30°C ... 150°C | 10 kΩ | 29490 Ω |
0x0039 | 57dec | NTC10K_3204 | -40°C ... 110°C | 10 kΩ | 27080 Ω |
0x003A | 58dec | NTC10KTYP2 | -50°C ... 130°C | 10 kΩ | 32770 Ω |
0x003B | 59dec | NTC10KTYP3 | -50°C ... 130°C | 10 kΩ | 29588 Ω |
0x003C | 60dec | NTC10KDALE | -50°C ... 130°C | 10 kΩ | 32660 Ω |
0x003D | 61dec | NTC10K3A221 | -40°C ... 130°C | 10 kΩ | 32639 Ω |
0x003E | 62dec | NTC20K | -20°C ... 150°C | 20 kΩ | 70200 Ω |
0x0064 | 100dec | Poti/resistor, resolution 0.1 Ω / digit | 0 ... 6553.5 Ω | - | - |
0x0065 | 101dec | Poti/resistor, resolution 1 Ω / digit | 0 ... 65535 Ω | - | - |
0x0066 | 102dec | Poti/resistor, resolution 10 Ω / digit | 0 ... 655350 Ω | - | - |
0x00C8 | 200dec | NTC100K | -40°C ... 130°C | 100 kΩ | 3266 kΩ |
0x00FF | 255dec | user-defined NTC |
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| Avoid the mixed operation of low-resistance PT/NI sensors and high-resistance NTC sensors on one terminal Due to large differences in the resistances of the sensor types, the mixed operation of low-resistance PT/NI sensors and high-resistance NTC sensors on one terminal should be avoided, since larger measuring errors can then occur for the PT/NI sensors. |
R40: Conversion time for all channels
You can specify the conversion time for all channels of the terminal with register R40 of the first channel (default: 10dec, approx. equal to 120 ms per channel).
R41: B-parameter for user-defined NTC
This register contains the B-parameter of a user-defined NTC (default: 3960dec = 0x0F78).
The user-defined NTC can be activated by setting register R39 to 255dec.
R42: Resistance at 25 °C for user-defined NTC
The resistance is specified in 10 Ω / digit. 1000dec is thus equal to 10 kΩ
(Default: 1000dec = 0x03E8).
R43: Reference temperature for user-defined NTC
(Default: 25 °C = 0x0019)
R44: Lower range limit for user-defined NTC
(Default: -40 °C = 0xFFD8)
R45: Upper range limit for user-defined NTC
(Default: 130 °C = 0x0082)