Mitsubishi Electric FX3G SERIES Programming Manual page 359
Programmable controllers
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Also See for FX3G SERIES:
- User manual (532 pages) ,
- Hardware manual (8 pages) ,
- Quick start manual (2 pages)
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FX
/FX
/FX
Series Programmable Controllers
3G
3U
3UC
Programming Manual - Basic & Applied Instruction Edition
Related instructions
The following instructions can be combined with high-speed counters:
Instruction
DHSCS
DHSCR
DHSZ
DHCMOV
DHSCT
Cautions
1. Selection of the count comparison method
1)
FX
/FX
PLC
3U
3UC
When the HSCR instruction is used in FX
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
-
When the output should be given when the counting result becomes equivalent to the comparison value
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)
-
When counting is important, but the effect of the scan time can be ignored in operations depending on the
counting result
-
When the number in an instruction is more than 32
M8000
FNC229
LDD<=
M8000
2)
FX
PLCs
3G
When the HSCR instruction is used in FX
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
-
When the output should be given if the counting result becomes equivalent to the comparison value
regardless of 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
-
When an instruction is used 6 times or more
FNC229
LDD<=
M8000
FNC No.
FNC 53
High-speed counter set
FNC 54
High-speed counter reset
FNC 55
High-speed counter zone compare
FNC189
High-speed counter move
FNC280
High-speed counter compare with data table
/FX
3U
FNC189
C251
DHCMOV
K10000
D100
FNC 50
REF
PLCs, the total frequency of each counter is affected.
3G
K10000
C251
FNC 50
REF
13 High-Speed Processing – FNC 50 to FNC 59
13.5 FNC 54 – HSCR / High-Speed Counter Reset
Instruction name
PLCs, hardware counters (C235, C236, C237, C238, C239,
3UC
D100
K0
RST
Y010
Y010
K8
RST
Y010
Y010
K8
11
12
13
14
15
16
17
18
19
20
357
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