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5. MONITOR FUNCTIONS AND THEIR USE
MELSEC-A
(3)
Sequence program set by using the PC CPU
A sequence program which satisfies the following item is necessary.
However, it is not necessary to create the following sequence program
if the sequence program data for doing monitoring control can be used
as is.
(a) Data collection trigger
A sequence program is necessary to turn ON and OFF the bit device
in which data collection timing is to be determined when specifying
the leading edge and falling edge of a bit device.
(b) Monitor device
A value stored in a monitor device is handled as 16- or 32-bit data.
If the weight varies from the monitor device, use a sequence program
to do weight conversion.
Control the value so that a graph in the range from the lower limit to
the upper limit can be displayed.
[The range in which the monitoring condition is set and the number of possible settings)
The following table indicates (a) the range of the set value in the set polygon
graph window, and (b) the number of possible monitoring condition settings
for displaying polygonal line graphs.
Number of Pos-
sible Monitoring
Condition
Setting l1em
Setting l1em/Selection (Reference Section)
Remarks
Settings
One
All
Screen
Screens
Trigger
Always/bit device leading edge/falling edge (see Section 6.7)
-
Graph sprite frame
X axis: 0 to 639; Y axis: 0 to 399
Dot
Space specific a-
Number of X axis
Number of points: 2 to 100
tion is not
points/space
necessary.
(Display)
Data type
16-bit
32-bit
Display format
Upper limit
32767
2147463647
32767
-
x the
to
to
Lower limit
-32768
-2147483648
32767
num-
ber of
Number of bars per
screens
graph
1
to
8
Per graph
Device
Word device continuous/random
(see Section 6.7)
Color
Color Nos.O to 14 (see Section 6.4.1)
Number of X
Line
Line Nos.O to 4
axis points x
Monitoring device
number of
Graph
Line
type
(see Section 6.3.3)
graphs is necee-
[see
J
attribute Line
Line size Nos.O to 3
sary.
Section
size
(see Section 6.3.3)
6.9.1
5-76
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