Chapter 7 Usage of Various Functions
7-1
Chapter 7. Usage of Various Functions

7.1 Built-in Functions

7.1.1 High-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 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