1-, 2-channel incremental encoder interface KL5151, KS5151
Signal LED
Signal LED CH. B
Signal LED CH. C 
Signal LED CH. A 
Power contact
+24 V
Power contact 0 V
+24 V
0 V
Top view 
Contact assembly 
extended temperature range
1-, 2-channel incremental encoder interface KL5152, KS5152
Signal LED B2
Signal LED B1
Signal LED A2 
Signal LED A1 
Power contact
+24 V
Power contact 0 V
+24 V
0 V
Top view 
Contact assembly 

KL5151, KL5152 | 1-, 2-channel incremental encoder interface

The KL5151/KL5152 Bus Terminal is an interface with 24 V inputs for the direct connection of incremental encoders. A 32 bit (KL5151) or 16 bit (KL5152) counter with a quadrature decoder and a 32 bit (KL5151) or 16 bit (KL5152) latch for the zero pulse can be read, set or enabled. The KL5151 inputs can optionally be used as single or two-counter inputs. The KL5152 indicates the logical state of the signals via LEDs. The signal inputs use 0 V as the reference potential and are electrically isolated from the K-bus.

Technical data KL5151 | KS5151 KL5152 | KS5152
Technology incremental encoder interface 24 V DC, EN 61131-2, type 1, “0”: < 5 V DC, ”1”: > 15 V DC, typ. 5 mA
Number of channels 1 incremental encoder 2 incremental encoders
Encoder connection A, B, C, gate/latch, 24 V A1, B1, A2, B2, 24 V
Sensor inputs 1 2
Encoder operating voltage 24 V DC
Encoder output current
Counter 32 bit, binary
Limit frequency 400,000 increments/s (with 4-fold evaluation)
Quadrature decoder 4-fold evaluation
Zero-pulse latch 32 bits
Commands read, set, enable read
Power supply 24 V DC (-15 %/+20 %)
Supply voltage 24 V DC (-15 %/+20 %)
Current consumption power contacts
Current consumpt. K-bus typ. 40 mA
Bit width in the process image input/output: 2 x 32 bit data, 2 x 8 bit control/status
Weight approx. 50 g
Operating/storage temperature -25…+60 °C/-40…+85 °C 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
Special terminals
KL5151-0021 incremental encoder 1 x 32 bit A, B, capture input and 1 driver output 24 V, 0.5 A
KL5151-0050 incremental encoder 2 x 32 bit A, B-track