Digital length counter LMD6-4/12-24V

L=(1 ... 999999 m), Us=12÷24V ac/dc, 2 outputs 4A/220V, 95x49x113mm

Price 84.76 EUR no VAT

The digital length counter LMD6-4/12-24V is a microprocessor device with a 6-digit display. It can measure lengths up to 999999 meters and has two output relays. Two limit values "L1" and "L2" can be set. By setting the conversion factor "C" the received electrical impulses in the counter are converted into a linear length. The length counter has a floating point and can indicate "m", "dm", "cm" and "mm". Programmatically can be set various parameters defining the operation of the counter. The device has an energy-independent memory. The length counter is designed for installation in a dashboard (panel montage).


The LMD6-4 digital length counter is designed to measure the linear length of fabrics, pipes and other materials, which in their movement rotate a control roller, from which by certain sensor electric impulses are sent to the input of the counter. For each pulse, the counter adds the value of the coefficient "C" to the total measured length. The coefficient "C" is set by the operator in advance when setting the counter. The location of the decimal point of the display can be set so that the length is displayed in meters (m), decimeters (dm), centimeters (cm) or millimeters (mm). In the counter there is a possibility to set two limit lengths "L1" and "L2". When "L1" is reached, the output Relay-1 is switched off, and when "L2" is reached, the output Relay-2 is switched off.


Digital indication, LED - red 6 digits, h=10 mm (height)
Counting range, L 0.001 … 999999 m
Supply voltage, Us 12÷24V ac/dc (11÷31Vdc / 11÷27Vac)
Power consumption, P 3 W (125 mA)
Output - Relay-1 (L1) 4A / 220VAC (NO+NC)
Output - Relay-2 (L2) 4A / 220VAC (NO+NC)
Maximum counting frequency, Fmax 1 kHz (10 kHz option)
Operating temperature, Tamb -20º...+50º C
Degree of protection IP40
Joining Terminal block
Overall dimensions 95х49х113 mm

Programmable parameters

Limit value,  L1 (m) 0.001 ÷ 999999
Limit value,  L2 (m) 0.001 ÷ 999999
Coefficient,  C 0.001 ÷ 99.999
Position of the decimal point,  dP 0000. / 000.0 / 00.00 /0.000
Time between two adjacent pulses (00 = infinity),  t (sec) 0.0 ÷ 999.9 
Active input front (high / low),  In Lo / Hi
Operating mode (increment / decrement) Inc / dEc
Interruption of the supply voltage, Us :
      - after an interruption, the counting continues from the current data Cont
      - after an interruption, the counting automatically starts from the beginning Full
      - after an interruption, a stop mode of the current data is established Ucc
      - after an interruption, the counter is reset Goto
Automatic start when the power is turned on for the first time no / Auto
Initial state of the output relay (Status), St ⌈‾⌉  /  ⌉_⌈
Upon reaching L2 :  is reset  / the output turns off, the counting continues End G / End C

Schemes of connection

Scheme of connection of NPN sensor to CD6-3 and LMD6-5 counter


Connecting an NPN sensor to the counter input

Scheme of connection of a button switch to the CD6-4 and LMD6-4 counter


Connecting switch K1 to the counter input

PNP sensor connection diagram

Scheme of connection of PNP sensor to controller


Connect a PNP sensor to the counter input by adding a 2K / 0.5W resistor.

Overall dimensions (mm)

Overall dimensions of the housing 95x49x113 of the controller for panel mounting

Short description

The LMD6-4 digital length meter is an electronic device used as a means of automating production processes for measuring quantitative values. Used for switching direct current and alternating current electrical circuits.

Typical parameters of the length counter LMD6-4

LMD6-4 / 12-24V11÷31VDC / 11÷27VAC3W (125mA)
LMD6-4 / 220V220VAC ±10%4W (16mA)