8-channel input terminal PT1000, Ni1000 (RTD) KL3228
Error LED 8
Error LED6
Error LED 4
Error LED2
Error LED7 
Error LED5 
Error LED3 
Error LED1 
Power contact
+24 V
Power contact 0 V
+R1
+R3
+R5
+R7
+R2
+R4
+R6
+R8
Top view 
Contact assembly 
extended shock and vibration range

KL3228 | 8-channel input terminal PT1000, Ni1000 (RTD)

The KL3228 analog input terminal enables connection of eight resistance sensors. The Bus Terminal’s circuitry can handle sensors using the 1-wire technique. Linearisation over the full temperature range is realised with the aid of a microprocessor. The temperature range can be selected freely. The Bus Terminal’s standard settings are: resolution 0.1 °C within the temperature range of Ni1000 sensors. The error LEDs indicate sensor faults (e.g. a broken wire).

Technical data KL3228 | KS3228
Number of inputs 8
Power supply via the K-bus
Technology 1-wire
Sensor types PT1000, Ni1000
Connection method 1-wire
Measuring range -50…+150 °C (PT sensors); -50…+150 °C (Ni sensors)
Conversion time ~ 1 s
Measuring current ~ 0.5 mA typ.
Resolution 0.1 °C per digit
Measuring error ~ ±1 °C, depending on wiring
Electrical isolation 500 V (K-bus/signal voltage)
Current consumption power contacts
Current consumpt. K-bus typ. 85 mA
Bit width in the process image input: 8 x 16 bit data (8 x 8 bit control/status optional)
Configuration no address setting, configuration via Bus Coupler or controller
Special features open-circuit recognition
Weight approx. 75 g
Operating/storage temperature 0…+55 °C/-25…+85 °C
Relative humidity 95 %, no condensation
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Pluggable wiring for all KSxxxx Bus Terminals
Approvals CE, UL, Ex