18

Up/Down Counting Pulse Indicator

K3HB-C

Operation

■ Functions (Operating Modes)

F1 to F3

Note: 1. Meaning of H and L in Display

2. Requires at least half the minimum signal width. If there is less than half, a ±1 count error may occur.

Input Type Setting

Function name

Function No.

Individual inputs

f1

Phase differential inputs f2

Pulse counting input

f3

Function

Operation

Operation image (application)

F1

Individual

inputs

Counts input A as incremental pulses and input B as

decremental pulses. The count is incremented on the

rising edge of input A and decremented on the rising

edge of input B. If both inputs rise at the same time, the

count is not changed. The count is incremented when

input B is later than input A and decremented when input

B is earlier than input A.

Counting the number of people entering an area

F2

Phase dif-

ferential in-

puts

This function is normally used when connected to an

incremental rotary encoder. The count is incremented on

the falling edge of input B when input A is OFF. The count

is decremented on the rising edge of input B when input

A is OFF.

Detecting position and speed on a semiconductor wafer conveyor line

F3

Pulse

counting

input

Counted on the rising edge of input A

Counting the number of workpieces

Symbol

Input method No-voltage input

H

Short-circuit

L

Open

Input A

Input B

HOLD input

L

H

L

H

L

H

Count

0

1

2

3

2

11

2

3

BCD output

Photoelectric

sensor

To

Programmable

Controller

Increment

Decrement

Input A

Input B

Count

0

1

2

3

2

11

HOLD

input

0

L

H

L

H

L

H

(See note 2.)

Wafer

E6L

Input A

HOLD

input

L

H

L

H

Count

0

1

2

3

4

5

6

BCD output

To

Programmable

Controller

NO: Voltage pulse high

NC: Voltage pulse low

No-contact or voltage pulse input 00

01

Contact

10

11