Filter
Top Products
FX Series Programmable Controllers Devices in Detail 4
4-26
Counter speeds:
• The maximum countin
g
speed is dependent on the t
y
pe, quantit
y
of counters and on
how man
y
hi
g
h speed counter instructions are bein
g
used. The followin
g
tables
g
ive the
approximate maximum countin
g
speed for each identified case.
• Please take care when usin
g
the speed instruction (SPD, FNC 56). This instruction is
treated as if it was a sin
g
le phase counter. This must be accounted for when the sum
countin
g
speeds are calculated.
1 Phase Counters
A/B Phase Counters
A/B Phase Counters Used with Either a 1 or 2 Phase Counter
The frequenc
y
of the A/B phase counter must be kept below 1 kHz. The maximum frequenc
y
of the 1, 2 phase counter is listed in the followin
g
table:
Counter
input
Number
of
counters
Frequency in kHz
No execution of high
speed instructions
Execution of
(D)HSCS/R
(1 to 6 instructions)
Execution of (D)HSZ
(1 to 2 instructions)
X0, X2, X3
(10 kHz inputs)
110 7 5
210 4
2.5
36.6 2.5
X0 to X5
(When X0, X2
and X3 are not
used exclu-
sively)
1754
23.5 2.5
1.5
3
2.5
2
4
1.55
6
Counter
input
Number
of
counters
Frequency in kHz
No execution of high
speed instructions
Execution of
(D)HSCS/R
(1 to 6 instructions)
Execution of (D)HSZ
(1 to 2 instructions)
C251 - C255
1
2
22
21.51.5
Counter
input
Number
of
counters
Frequency in kHz
No execution of high
speed instructions
Execution of
(D)HSCS/R
(1 to 6 instructions)
Execution of (D)HSZ
(1 to 2 instructions)
With 1 A/B
phase counter
at 1 kHz
1543
24
2
133
42 1