Digital length counter LMD6-8R/12-24V

L=(-999.95 ... 9999.95 mm), Us=12÷24V ac/dc, 95x49x113mm

Price 70.2 EUR no VAT

The LMD6-8R/12-24V reversing controller for length measurement is a microprocessor device with a 6-digit display. There is no relay output and it is used for measuring and visualizing lengths in the range from -999.95mm to 9999.95mm. It has two inputs "A" and "B" and operates together with a sensor type "NPN" with two phase-shifted outputs (OVM1-18.24.F). The controller saves its current data in the event of a power failure. The device is designed for installation in a dashboard (panel montage).


The LMD6-8R reversible digital controller is used to measure and visualize linear lengths. Shows both positive and negative lengths, which are indicated in millimeters. The controller has two counting inputs A and B, and is designed to operate in a system consisting of an optoelectronic sensor type OVM1-18.24.F (with two phase-shifted outputs) and a measuring ruler with a raster of 0.5mm (Fig. 1). The length measuring controller has three operating modes (I, II and III), which determine the discreteness when reading the length: 1mm, 0.5mm and 0.25mm. Switching from one mode to another is done by pressing and holding the "Reset" button for six seconds. There is a variant LMD6-8RC indicating the length in centimeters (on request). Analog output 0...4V (on request).


Digital indication, LED - red 6 digits, h=10 mm (height)
Measuring range, L
- in mode I -99999 … 999999 mm
- in mode II -9999,5 … 99999,5 mm
- in mode III -999,75 … 9999,75 mm
Supply voltage, Us 12÷24V ac/dc (11÷31Vdc / 11÷27Vac)
Power consumption, P 2 W (85 mA)
Maximum counting frequency, Fmax 11 kHz
Operating temperature, Tamb -20º...+50º C
Degree of protection IP40
Joining Terminal block
Overall dimensions 95х49х113 mm


Application for length measurement with slotted optical sensor and measuring line - sketch


Scheme of connection

Scheme of connection of NPN encoder to CD6-6R counter


Connecting an NPN encoder to the counter input

PNP encoder connection diagram

Scheme of connection of PNP encoder to controller


Connect a PNP encoder to the counter input by adding two 2K / 0.5W resistors.



Overall dimensions (mm)

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

Short description

The reversible LMD6-8R digital length meter used as a means of automating production processes for measuring quantitative values. Used to visualize positive and negative displacements.

Typical parameters of the length counter LMD6-8R

LMD6-8R / 12-24V11÷31VDC / 11÷27VAC2W (85mA)
LMD6-8R/ 220V220VAC ±10%4W (16mA)