Up/down counter 24 V DC, 100 kHz KL1501
Signal LED 1
Signal LED 3
Signal LED 2
Signal LED 4
Power contact
+24 V
Power contact 0 V
Up/down clock1 
Output 1
+24 V
0 V
Output 2
Top view 
Contact assembly 
extended temperature range
extended shock and vibration range 25g

KL1501 | Up/down counter 24 V DC, 100 kHz

The KL1501 Bus Terminal is an up/down counter. It transmits the counter state to the higher-level automation device in an electrically isolated manner. When it is used as a single-channel up/down counter (32 bit), the pulse is set via the clock input, while the count direction is set via the up/down input. The input can also be used as a gate input for triggering the counter. In two-counter mode, two separate counters (Clock and Clock1 inputs) with each 16  bit are available, which can be parameterised as up or down counters. The signal state of the inputs and outputs is indicated by light emitting diodes. Both outputs are switched according to the counter state, so that they can be used as fast control signals for field devices.

Technical data KL1501 | KS1501
Connection technology 1 x up/down counter, 2 x up or down counter
Specification EN 61131-2, type 1, “0”: < 5 V DC, “1”: > 15 V DC, typ. 5 mA
Number of counters 1 or 2
Nominal voltage 24 V DC (-15 %/+20 %)
“0” signal voltage -3…+5 V (EN 61131-2, type 1)
“1” signal voltage 15…30 V (EN 61131-2, type 1)
Counting frequency max. 100 kHz (2 kHz for switching between up and down)
Counter depth 32 bit
Input current typ. 5 mA (EN 61131-2, type 1)
Max. output current 24 V/0.5 A (short-circuit proof) per channel
Current consumption K-bus typ. 50 mA
Current consumption power contacts load only
Electrical isolation 500 V (K-bus/field potential)
Bit width in the process image 40 inputs/outputs: 32 bit data, 8 bit control/status
Configuration no address setting, configuration via Bus Coupler or controller
Special features set counters, switch outputs
Weight approx. 50 g
Operating/storage temperature -25…+60 °C/-40…+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, IECEx
Special terminals
KL1501-0010 gate-counter with auto-reset and setting A0
KL1501-0011 up/down counter with 5 V inputs, 24 V DC outputs