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PART 2: CX-Server PLC Tools
OMRON
CHAPTER 5 – Data Trace/Time Chart Monitor Component
CX-Server PLC Tools_ Page 61
*2 This option can be selected only for a CJ2H CPU Unit.
*3 This check box can be selected only for a CJ2 CPU Unit.
Settings on [Trace Object] Tab
Set trace object. The operation procedure is as same as the one on” Parameter Settings of Data Trace for
CS/CJ/CP”.
Operations at Executing Continuous Data Trace
Continuous Data Trace enables the following operations in addition to usual trace.
♦
Performance Monitor screen is displayed. Whether all trace data is obtained or not can be confirmed with the
screen. When not all trace data is obtained, the speed at which CPU saves the sampling data to trace memory
possibly exceeds the communications speed between PC and PLC. Adjust sampling intervals and the size of
trace object accordingly.
♦
Performance Monitor Screen displays the following items.
Display the numbers related to the IDs collected into PC out of IDs which are stored in trace memory.
Items Details
[No. of IDs on CPU]
Show the number which CJ2 CPU Unit sampled.
[IDs Obtained]
Show the number of sampling data which are collected in PC.
[Obtained
Percentage]
Show the obtained rate of the data collected to PC in percentage.
♦
When any missing occurs, reduce the number of logging objects or extend the sampling intervals. The
missing will be eliminated.
Note:
A straight line will be displayed for any data that cannot be obtained.
Note:
The size per 1 sampling data is [the size of trace object except for bit data] +6ch.
(Adjustment example)
Obtained percentage is 80%, logging object except for bit data is 10ch, sampling intervals is
10ms:
1. Adjustment with reducing the number of logging objects: the following formula is applied.
[Size per 1 sampling after adjustment]=[Size per 1 sampling before adjustment]*[Obtained
percentage]
(10+6)
×
0.8 =16
×
0.8=12.8
≡
12
Reducing 4ch trace objects (becoming 6ch as trace objects) makes the obtained percentage
100%.
2. Adjustment with extending sampling intervals: the following formula is applied.
[Sampling cycle after adjustment]=[Size of trace object]/[Size allows sampling in 1ms]=[Size
of trace object]/([Size of Trace object]/[Present sampling cycle]*([Obtained
percentage])=[Present sampling cycle]/([Obtained percentage])=[Present sampling
cycle]/([Obtained percentage])
10/0.8=12.5
≡
13
Changing sampling cycle to 13 ms makes the obtained percentage 100%.
Содержание CX-PROGRAMMER V9
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