LG Electronics 120S Built-in Functions, High-speed counter function, Performance Specifications

Chapter 7 Usage of Various Functions

Chapter 7. Usage of Various Functions

7.1Built-in Functions

7.1.1High-speed counter function

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

Counter format

Counter mode

	Preset function
Additional	Latch counter
	Comparison output
function
	RPM function

Description

•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)

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)

Change current value to preset value. Latches current value.

When current value is equal to comparison value, turns on the output contact points or executes interrupt program

Calculate the RPM(Rotates Per Minute) of input pulse

1) Performance Specifications

	Items	Specifications
	Points	Standard Type	Economic Type
		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 10kHz/ 2-phase 5kHz
		1-phase 20kHz/ 2-phase 10kHz ( Ch2, Ch3)	( 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 +	A-Phase : Input pulse, B-Phase : Direction pulse
Up / Down	direction input
	2-phase
selection		A-Phase : Up counting pulse, B-Phase : Down counting pulse
	CW/CCW mode
	2-phase	Auto-select by phase difference of A-phase and B
	multiplication mode
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
A / B phase				Preset input		Off voltage	6VDC or lower
	Off voltage		6VDC or lower			On delay time	200	㎲ or lower
						Off delay time	200	㎲ or lower
		7-1