Mitsubishi Electric MELSEC-Q Structured Programming Manual page 93

FXCPU Structured Programming Manual
[Device & Common]
7) In FX /FX
0 0N
Counter type
Magnification for
calculating total
Software
counter
1-phase C235 to C238,
1-counting C241 to C242,
input C244
1-phase
C246 to C247,
2-counting
C249
input
2-phase
C251 to C252,
2-counting
C254
input
It is not allowed to use 1-phase counters and 2-phase counters together.
Calculation example
Used high speed counter No.
C235(1-phase)
C236(1-phase)
Total frequency = 5 kHz
Sum of processing frequency = 1 kHz + 3 kHz = 4 kHz
Sum of processing frequency (4 kHz) ≤ Total frequency (5 kHz)
8) In FX PLCs
0S
Counter type
Magnification for
calculating total
Software
counter
1-phase C235 to C238,
1-counting C241 to C242,
input C244
1-phase
C246 to C247,
2-counting
C249
input
2-phase
C251 to C252,
2-counting
C254
input
Used high speed counter No.
C237(1-phase)
C238(1-phase)
C251(2-phase)
Total frequency = 14 kHz
Sum of processing frequency = 3 kHz + 3 kHz + 4 kHz = 10 kHz
Sum of processing frequency (10 kHz) ≤ Total frequency (14 kHz)
PLCs
Maximum
response
frequency frequency (kHz)
×1
5
×1
5
×1
2
Software counter
Software counter
Maximum
response
frequency frequency (kHz)
×1
7
×1
7
×1
2
Software counter
Software counter
Software counter
Total frequency
(kHz)
5
Input/output Magnification for calculating
frequency total frequency
×1
1kHz
×1
3kHz
Total frequency
(kHz)
14
Input/output Magnification for calculating
frequency total frequency
×1
3kHz
×1
3kHz
×1
2kHz
2 Devices in Detail
2.7 High Speed Counter [C]
Calculated value
1kHz
3kHz
Calculated value
3kHz
3kHz
4kHz
91
1
2
3
4
5
6
7