2-channel digital input terminal 24 V DC with short-circuit protected sensor supply and diagnostics KL1212
Signal LED1
Error LED1
Signal LED2
Error LED2
Power contact
+24 V
Power contact 0 V
Input 1
+24 V
Input 2
+24 V
0 V
+24 V
Top view 
Contact assembly 
extended shock and vibration range

KL1212 | 2-channel digital input terminal 24 V DC with short-circuit protected sensor supply and diagnostics

The KL1212 digital input terminal acquires the binary control signals from the process level and transmits them, in an electrically isolated form, to the higher-level automation unit. The KL1212 generates a short-circuit protected 24 V DC supply voltage for sensors. The sensor outputs can be switched on or off by the controller. A short-circuit or an open lead in the sensor supply is detected, and the terminal status is relayed to the controller via the K-bus. The Bus Terminal contains two channels that indicate their signal state and errors by means of LEDs.

Technical data KL1212 | KS1212
Connection technology 3-wire
Specification EN 61131-2, type 1
Number of inputs 2
Nominal voltage 24 V DC (-15 %/+20 %)
“0“ signal voltage -3…+5 V
“1“ signal voltage 15…30 V
Input filter typ. 3.0 ms
Input current typ. 5 mA
Sensor supply max. 0.5 A (short-circuit-proof)
Current consumpt. K-bus typ. 8 mA
Electrical isolation 500 V (K-bus/field potential)
Bit width in the process image input/output: 4 inputs (2 error bits/2 signal bits); 2 outputs (2 sensor supply)
Input/output bit assignments
input: bit 3 bit 2 bit 1 bit 0 output: bit 1 bit 0
err. 2 err. 1 on 2 on 1 off 2 off 1
Configuration no address or configuration setting
Weight approx. 55 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, GL
Product announcement
KL1212: available
KS1212: estimated market release on request