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App. - 38
Appendix 4.24 Application example of FIFO instruction
Manual coating work and its working time can be stored and duplicated by
machinery later.
MELSEC-Q
Conveyor system
Step
Coating bath
Teaching panel
20
21 22
23
24
25X
Position is detected by sensors of
X20 to 25
6)
1)
4)
Left Right
X01 X00
Cleaning
X02
Y73
In automatic
operation
Recording
X03
Reading
X05
Automatic Stop
X06 X07
Magnified view of teaching panel
Cleaning
(Y72)
Left (Y71) (Y70) Right
2)
3) 5)
6
1
2
8
4
16
32
6
135
150
120
100
20
135
6
1
2
8
4
16
32
0
0
0
135
6
150
120
100
20
135
0
0
32
D30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
D10
11
12
13
14
15
16
D20
21
22
23
24
25
26
Pointer
Step 1)
2)
3)
4)
5)
6)
Pointer
135
Coating bath
pattern
Cleaning
time
1
K2Y74
Read using FIFRP
Write using FIFWP
FIFO table
FIFO table
Data is backed up when X03 is turned on
Backed up data is read
when X05 is turned on
135
D0 (timer constant of T0)
Write using FIFWP
D0
K2X20
Current value of T1
Step 1)
2)
3)
4)
5)
6)
Read using FIFRP
Data is backed up when X03 is turned on
Backed up data is read
when X05 is turned on