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6. OPERATING THE VARIOUS LADDER MONITOR SCREENS
6 - 10
MELSEC
GOT
6.1.3 Using the defect search
The defect search enables you to examine an ladder block that caused a failure. It
helps you to search from the ladder block backward so that you can determine why
any coil was turned ON or OFF during the ladder monitoring, or whether its contact is
conductive or nonconductive.
POINT
While the MELSEC-QnA ladder monitor is performed, the factor search function
cannot be used.
(The touch key of
Fact.Sea.
is not displayed.)
[Operation procedure]
(1) Search for and display a ladder block where a failure
occurred.
Example: When a valve connected to Coil Y0030 does
not operate properly, begin searching for Coil
Y0030 and view its ladder block on the screen.
(2) Touch
Mon.
to start the ladder monitoring.
(3) Touch
Menu
and then select
Fact.Sea.
from among
options that appear on-screen.
If you touch
Fact.Sea.
without executing the ladder
monitor function, a message appears on-screen, telling
that "No MONITORING."
7
4
1
0
8
5
2
−
9
6
3
!
A
C
E
AC
B
D
F
DEL
-< >- DEVICE [ M
][
1
]
M120
42
STEP 67/ 932
Y0010
X0001
48
Y0023
K25
T0
X0002
Print
Screen
Cancel
Print
Exit MenuPLCRD. Mon.
M130 M131
X0010
46
D0C123MOV
T0
52
K50
T1
M669
54
M120
X0025
M120
57
Y0030
*
Mon.
Menu
18
M120
21
Y0025
Print
Screen
Exit MenuPLCRD. Mon.
Cancel
Print
Dev.Sea.
Cont.Sea.
Coil.Sea.
16/32Bit
10/16Dec.Hex.
Test
Step.Sea.
End. Sea.
Fact.Sea.
Cmnt.
Fact.Sea.
(Specify a device name) (Specify a device number)
57 Y0030
M
54
M120
X0025
STEP : 63/ 932
M120
6
6
9
9
R
A
-< >- DEVICE [ ][ ]
XYML
AC
B
DEL
G
F
Z
D
V
W
T
E
C
S
List
(4) Another dialog box where you can specify a device name
or device number is displayed on-screen. Specify any
contact of which coil is not turned ON as a search device.
Example: Specify "M120" as the search device.
: Used to select a data entry field.
Alphanumeric : Used to enter a device name or device
number.
*1
: Used to stop the defect search, returning
to the ladder monitor screen.
*1 Use the following touch keys if you want to delete any
data entry:
AC
: Clears all the data entered in a specific field.
DEL
: Clears one character at the cursor position.
(5) Start searching for a device that caused a failure and
view search results on the ladder monitor screen.
Search from the last step number backward as displayed
on the ladder monitor screen.
Please note that any touch keys other than
Esc
and
Exit
are enabled until the defect search is completed.