Mitsubishi Electronics FX3G User Manual
353
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
13 High-Speed Processing – FNC 50 to FNC 59
13.4 FNC 53 – HSCS / High-Speed Counter Set
11
FN
C30
-FN
C3
C30
-FN
C3
9
R
ota
tion and
Shi
ft
ft
12
FN
C40-FN
C40-FN
C49
D
ata O
perati
perati
on
13
FNC
50-FNC
59
High-Speed
Proc
essing
14
FM
C60-FN
C60-FN
C69
H
andy
In
struction
15
FN
C70-FN
C70-FN
C79
E
xternal
F
X
I/O
De
vice
16
FNC
80-FNC
89
External
FX
Dev
ice
ice
17
FNC1
00-
FNC10
00-
FNC10
9
Dat
a
a
Transfer 2
18
FNC1
10-
FNC139
FNC139
Fl
oati
ng Poi
nt
19
FNC14
0-F
N
C
149
Da
ta
Operation 2
20
FNC1
50-
FNC159
FNC159
Pos
itioning
itioning
Control
13.4.1 Common cautions on using instructions for high-speed counter
DHSCS (FNC 53), DHSCR (FNC 54), DHSZ (FNC 55) and DHSCT (FNC280) instructions are provided for high-speed
counters.
This section explains common cautions for these instructions.
counters.
This section explains common cautions for these instructions.
1. Limitation in the number of instances of each instruction in a program and number of
instructions driven at the same time
1) FX
3U
/FX
3UC
PLCs
DHSCS, DHSCR and DHSZ instructions can be used as many times as necessary in the same way as general
instructions. However, the number of simultaneously driven instructions is limited. The DHSCT instruction can
only be used once in any program.
instructions. However, the number of simultaneously driven instructions is limited. The DHSCT instruction can
only be used once in any program.
2) FX
3S
/FX
3G
/FX
3GC
PLCs
DHSCS, DHSCR and DHSZ instructions can be used as many times as necessary in the same way as general
instructions. However, the number of simultaneously driven instructions is limited.
instructions. However, the number of simultaneously driven instructions is limited.
2. Response frequency of high-speed counters
When the DHSZ or DHSCT instruction is used in FX
3U
/FX
3UC
PLCs, the maximum response frequency and total
frequency of every software counter are limited.
When the DHSCS, DHSCR or DHSZ instruction is used in FX
When the DHSCS, DHSCR or DHSZ instruction is used in FX
3S
/FX
3G
/FX
3GC
PLCs, the total frequency of high-speed
counters is limited.
→ For the total frequency in FX
3S
/FX
3G
/FX
3GC
PLCs, refer to Subsection 4.7.7.
→ For the maximum response frequency and total frequency in FX
3U
/FX
3UC
PLCs, refer to Subsection 4.8.10.
3. Specification of output numbers (Y) (FX
3G
/FX
3GC
/FX
3U
/FX
3UC
PLCs)
When using the same instruction for high-speed counter repeatedly or when driving two or more other instructions for
high-speed counter at the same time, specify such output devices (Y) whose high-order two digits are the same (in
units of 8 devices).
1) When using devices of the same number (in units of 8 devices)
high-speed counter at the same time, specify such output devices (Y) whose high-order two digits are the same (in
units of 8 devices).
1) When using devices of the same number (in units of 8 devices)
Example: When using Y000, specify Y000 to Y007. When using Y010, specify Y010 to Y017.
2) When using two or more instructions for high-speed counter and non-consecutive output (Y) numbers
A program example is shown below:
When C255 reaches K100, the output Y000 is driven by interrupt. Y010 is driven when END processing is
executed.
If interrupt drive is required, use an output number ranging from Y001 to Y007 whose high-order two digits are
equivalent.
executed.
If interrupt drive is required, use an output number ranging from Y001 to Y007 whose high-order two digits are
equivalent.
Instruction
Limitation in number of instructions driven at same time
DHSCS
32 instructions including DHSCT instruction
DHSCR
DHSZ
DHSCT
Only 1 (This instruction can only be used once.)
Instruction
Limitation in number of instructions driven at same time
DHSCS
6 instructions
DHSCR
DHSZ
FNC 53
DHSCS
K100
C255
Y010
FNC 53
DHSCS
K100
C255
Y000
M8000