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Mitsubishi Electronics FX3G User Manual

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111
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 Series
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.7 High-Speed Counter [C] (FX3S/FX3G/FX3GC PLCs)
1
Introdu
ction
2
Ov
ervi
ew
3
Instruction 
Li
st
4
D
evices 
in Det
ai
l
5
Specifi
ed the
De
vice
 &
 
C
onst
ant
6
Bef
ore
 
Pr
og
ra
mmi
ng
7
Bas
ic 
Instruction
8
FN
C00-FN
C0
9
Program Fl
ow
9
FNC
10-FN
C19
Mov
e & Com
pare
10
FNC
20-FNC
29
Arith. & Lo
gi
c 
Operati
on
2. Devices used to check the counting direction of 1-phase 2-count input counters and 
2-phase 2-count input counters
3. Devices used to switch the high-speed counter function
4.7.6
Assignment of counter input terminal and switching of function
When the counters C248, C253 and C254 are combined with the following special auxiliary relays, the allocation of the
input terminals and functions are changed.
In a program, put a special auxiliary relay just before a target counter.
Type
Counter No.
Monitoring device
OFF
ON
1-phase 
2-counting input
C246
M8246
Up-counting
Down-counting
C247
M8247
C248
M8248
C249
M8249
C250
M8250
2-phase 
2-counting input
C251
M8251
C252
M8252
C253
M8253
C254
M8254
C255
M8255
Device No.
Name
Description
M8388
Contact for changing function of
high-speed counter
Changes the function of high-speed counter.
M8392
Function switching 
device
Switches the function of C248 and C253.
(For details, refer to Subsection 4.7.6.)
M8395
Switches the function of C254. (For details, refer to Subsection 4.7.6.)
Counter No.
When using assignment of counter input terminal and
switching of function
Description
C248(OP)
•
Reset input is not provided.
C253(OP)
•
Reset input is not provided.
C254(OP)
•
The input count (2-phase 2-count) changes
as follows:
Phase A: Changes from X000 to X006.
Phase B: Changes from X001 to X007.
•
Reset input is not provided.
•
Start input is not provided.
M8388
M8392
C248
K{{{
M8388
M8392
C253
K{{{
M8388
M8395
C254
K{{{