Factory Automation

MELSEC-F series High-Speed Counting

Using high speed counters, high speed signals from encoder ans sensors can be counted.
Because FX PLC has built-in high performance high speed counters, high speed control is possible with a simple program. A high speed counter block with hardware comparator is also available.

High speed counter block/adapter

Model
(Number of channels) 		Type Highest response
frequency 		Hardware comparison
output function 		2-phase counter
edge count function 		Applicable FX PLC
FX
3S 		FX
3G 		FX
3U 		FX
3GC 		FX
3UC
FX2N-1HC
(1 ch)
1-phase
1-count 		Max. 50 kHz ○ - × × ○
Max.
8 units 		× *2*3
○
Max.
8 units
1-phase
2-count 		Max. 50 kHz
2-phase
2-count 		1 edge count:
Max. 50 kHz
2 edge count:
Max. 25 kHz
4 edge count:
Max. 12.5 kHz 		○
FX3U-2HC
(2 ch)
1-phase
1-count 		Max. 200 kHz ○ - × × ○
Max.
8 units 		× *2
○
Max.
4 units
1-phase
2-count 		Max. 200 kHz
2-phase
2-count 		1 edge count:
Max. 200 kHz
2 edge count:
Max. 100 kHz
4 edge count:
Max. 50 kHz 		○
FX2NC-1HC
(1 ch)
1-phase
1-count 		Max. 50 kHz ○ - × × × × *3
○
Max.
8 units
1-phase
2-count 		Max. 50 kHz
2-phase
2-count 		1 edge count:
Max. 50 kHz
2 edge count:
Max. 25 kHz
4 edge count:
Max. 12.5 kHz 		○
FX3U-4HSX-ADP
(4 ch)
1-phase
1-count 		Max. 200 kHz × ○ × × *1
○
Max.
2 units 		× ×
1-phase
2-count 		Max. 200 kHz
2-phase
2-count 		1 edge count:
Max. 100 kHz
4 edge count:
Max. 100 kHz
  • *1 When used together with analog or communication adapters, function expansion board is required.
  • *2 When connecting to FX3UC, FX2NC-CNV-IF or FX3UC-1PS-5V is required.
  • *3 FX3UC-32MT-LT(-2): 7 units. FX3UC-**MT/D, FX3UC-**MT/DSS, FX3UC-16MR/D(S)-T: 8 units.

Built-in high speed counter function (high speed input adapter function)

FX3S Series PLC

Type Counter No.
Highest
response
frequency * 		Max. response
frequency when
high speed processing
instruction is used * 		Supported high speed processing instructions High
speed
counter
move 		2 phase
counter
multi-
count
function 		FX3U-4HSX-ADP
max. response
frequency
(FX3U only)
When
high speed
comparison
SET/RESET
is used 		When
high speed
band
comparison
HSZ
is used 		High
speed
comparison
SET 		High
speed
comparison
RESET 		High
speed
band
comparison 		Counter
interrupt 		High
speed
table
comparison
1-
phase
1-
count 		C235,
C236,
C241
Max. 2 pts：
Max. 60 kHz 		overall frequency
60 kHz 		○ ○ ○ × × × - ×
C237 to C240,
C242 to C245
Max. 4 pts：
Max. 10 kHz
1-
phase
2-
count 		C246
Max. 1pt：
Max. 60 kHz
C247,
C248,
C248(OP)
C249,
C250
Max. 2 pts：
Max. 10 kHz
2-
phase
2-
count 		C251
Max. 1pt：
Max. 30 kHz 		×
C252,
C253,
C253(OP)
C254,
C255
Max. 2 pts：
Max. 5 kHz
  • * Regarding high speed counter reponse frequency, the overall frequency is limited. For details, please refer to the programming manual.

FX3G, FX3GC Series PLC

Type Counter No.
Highest
response
frequency * 		Max. response
frequency when
high speed processing
instruction is used * 		Supported high speed processing instructions High
speed
counter
move 		2 phase
counter
multi-
count
function 		FX3U-4HSX-ADP
max. response
frequency
(FX3U only)
When
high speed
comparison
SET/RESET
is used 		When
high speed
band
comparison
HSZ
is used 		High
speed
comparison
SET 		High
speed
comparison
RESET 		High
speed
band
comparison 		Counter
interrupt 		High
speed
table
comparison
1-
phase
1-
count 		C235,
C236,
C238,
C239,
C241
Max. 4 pts：
Max. 60 kHz 		overall frequency
60 kHz 		○ ○ ○ × × × - ×
C237,
C240,
C242 to C245
Max. 2 pts：
Max. 10 kHz
1-
phase
2-
count 		C246,
C248(OP)
Max. 2 pts：
Max. 60 kHz
C247 to C250
Max. 2 pts：
Max. 10 kHz
2-
phase
2-
count 		C251,
C253(OP)
Max. 2 pts：
Max. 30 kHz 		×
C252 to C255,
C254(OP)
Max. 2 pts：
Max. 5 kHz
  • * Regarding high speed counter reponse frequency, the overall frequency is limited. For details, please refer to the programming manual.

FX3U, FX3UC Series PLC

Type Counter No.
Highest
response
frequency * 		Max. response
frequency when
high speed processing
instruction is used * 		Supported high speed processing instructions High
speed
counter
move 		2 phase
counter
multi-
count
function 		FX3U-4HSX-ADP
max. response
frequency
(FX3U only)
When
high speed
comparison
SET/RESET
is used 		When
high speed
band
comparison
HSZ
is used 		High
speed
comparison
SET 		High
speed
comparison
RESET 		High
speed
band
comparison 		Counter
interrupt 		High
speed
table
comparison
1-
phase
1-
count 		C235 to C240
Max. 6 pts：
Max. 100 kHz 		40 kHz 40-
(Number
of times of
use of instruction) 		○ ○ ○ ○ ○ ○ - 200 kHz
C244(OP),
C245(OP)
Max. 2 pts：
Max. 10 kHz 		10 kHz 200 kHz
C241 to C245
Max. 3 pts：
Max. 40 kHz 		40 kHz -
1-
phase
2-
count 		C246,
C248(OP)
Max. 2 pts：
Max. 100 kHz 		40 kHz 200 kHz
C247 to C250
Max. 2 pts：
Max. 40 kHz 		40 kHz -
2-
phase
2-
count 		C251,
C253
Max. 2 pts：
Max. 50 kHz
(1 edge count, 4 edge count) 		1 edge count 40 kHz ○ 100 kHz
4 edge count 10 kHz (40-
Number
of times of
use of
instruction)÷4
C252,
C253(OP),
C254,
C255
Max. 2 pts：
Max. 40 kHz 		1 edge count 40 kHz 40-
(Number
of times of use of instruction) 		-
4 edge count 10 kHz (40-
Number
of times of
use of
instruction)÷4
  • * Regarding high speed counter reponse frequency, the overall frequency is limited. For details, please refer to the programming manual.

Variety of functions