Mitsubishi Electronics Mitsubishi Digital Electronics Video Gaming Accessories FX3G ユーザーズマニュアル
354
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
13 High Speed Processing – FNC 50 to FNC 59
13.5 FNC 54 – HSCR / High Speed Counter Reset
Related instructions
The following instructions can be combined with high speed counters:
Cautions
1. Selection of the count comparison method
1) FX
3U
/FX
3UC
PLC
When the HSCR instruction is used in FX
3U
/FX
3UC
PLCs, hardware counters (C235, C236, C237, C238, C239,
C240, C244 (OP), C245 (OP), C246, C248 (OP), C251 and C253) are automatically switched to software
counters, and the maximum frequency and total frequency of each counter are affected.
Refer to the counting operation described below, and select according to the contents of control whether to use
HSCR instruction or general-purpose comparison instruction.
a) Case to select DHSCR instruction
counters, and the maximum frequency and total frequency of each counter are affected.
Refer to the counting operation described below, and select according to the contents of control whether to use
HSCR instruction or general-purpose comparison instruction.
a) Case to select DHSCR instruction
-
When the output should be given when the counting result becomes equivalent to the comparison value
regardless of the scan time of the PLC
regardless of the scan time of the PLC
b) Cases to select a general-purpose comparison instruction
-
When the frequency is beyond the counting performance of software counters (and below the counting
performance of hardware counters)
performance of hardware counters)
-
When counting is important, but the effect of the scan time can be ignored in operations depending on the
counting result
counting result
-
When the number in an instruction is more than 32
2) FX
3G
PLCs
When the HSCR instruction is used in FX
3G
PLCs, the total frequency of each counter is affected.
Refer to the counting operation described below, and select according to the contents of control whether to use
the HSCR instruction or a general-purpose comparison instruction.
a) Case to select the HSCR instruction
the HSCR instruction or a general-purpose comparison instruction.
a) Case to select the HSCR instruction
-
When the output should be given if the counting result becomes equivalent to the comparison value
without regard to the scan time of the PLC
without regard to the scan time of the PLC
b) Cases to select a general-purpose comparison instruction
-
When counting is regarded as important, but the effect of the scan time can be ignored in operations
according to the counting result
according to the counting result
-
When an instruction is used 6 times or more
Instruction
FNC No.
Instruction name
DHSCS
FNC 53
High speed counter set
DHSCR
FNC 54
High speed counter reset
DHSZ
FNC 55
High speed counter zone compare
DHCMOV
FNC189
High speed counter move
DHSCT
FNC280
High speed counter compare with data table
M8000
FNC189
DHCMOV
C251
D100
K0
RST
Y010
FNC229
LDD<= K10000
D100
M8000
FNC 50
REF
Y010
K8
FNC229
LDD<=
K10000
C251
RST
Y010
Y010
K8
FNC 50
REF
M8000