Lg Electronics 120S Manuale Utente

 

7-1 

 

 

This chapter describes the specification, handling, and programming of built-in high speed counter of MASTER-K120S. The 

built-in high speed counter of MASTER-K120S(hereafter called HSC) has the following features; 

 

Function 

Description 

Counter format 

• Linear counter : Up/Down counter. 

Counting range is from -2,147,483,648 to 2,147,483,647 

• Ring counter : Counter value rotates from 0 to (set value-1) 

Counter mode 

4 counter functions as followings 

• 1-phase operation mode   

• 1-phase pulse + direction mode : Up / down is selected by direction pulse 

• 2-phase CW/CCW mode : Up / down is selected by CW or CCW pulse input 

• 2-phase multiplication mode : Up / down is automatically selected by the phase   

difference between A-phase and B.(multiplied by 4) 

Preset function 

Change current value to preset value. 

Latch counter 

Latches current value. 

Comparison output  When current value is equal to comparison value, turns on the output contact points or 

executes interrupt program 

Additional 

function 

RPM function 

Calculate the RPM(Rotates Per Minute) of input pulse 

 

1) Performance Specifications 

 

Items 

Specifications 

Standard Type 

Economic Type 

Points 

1 phase : 4 points, 2 Phase : 2 points 

1 phase : 2 points, 2 Phase : 1 points 

Max. counting speed 

1-phase 100kHz/ 2-phase 50kHz ( Ch0, Ch1)

1-phase 20kHz/ 2-phase 10kHz ( Ch2, Ch3) 

1-phase 10kHz/ 2-phase 5kHz   

( Ch0, Ch1) 

Input types 

A-Phase, B-Phase, Preset input 

Counting ranges 

from -2,147,483,648 to 2,147,483,647(Binary 32 bits) 

1-phase Up 

counter 

1-phase Pulse +   

direction input 

A-Phase : Input pulse,    B-Phase : Direction pulse 

2-phase  

CW/CCW mode 

A-Phase : Up counting pulse,    B-Phase : Down counting pulse 

Up / Down 

selection 

2-phase  

multiplication mode 

Auto-select by phase difference of A-phase and B 

Additional function 

Ring counter, Latch counter, Preset, Comparison output, RPM function 

 

2) Input specification 

Items 

Specifications 

Items 

Specifications 

Rated input   

24VDC (7mA) 

Rated input 

24VDC (7mA) 

On voltage 

20.4 ~ 28.8VDC   

On voltage 

20.4 ~ 28.8VDC   

Off voltage 

6VDC or lower 

On delay time 

200  ㎲ or lower 

A / B phase 

Off voltage 

6VDC or lower 

Preset input 

Off delay time 

200  ㎲ or lower