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Set the data sampling rate.
Selection
High-speed Scan
Low-speed Scan
Set the data sampling period.
Specify the value and unit to control whether data is sampled every scan or once in more
than one scan.
To sample data every scan, specify the same value as the scan setting.
Specify whether data is to be logged synchronized or asynchronized with the scan.
Selection
Description
Data is written to
Synchronous
the log synchro-
scanning
nously with the
scan
Data is written to
Asynchronous
the log asynchro-
scanning
nously with the
scan.
Refer to the following section for guidelines on scan settings.
Scan Setting Guidelines on page 12-11
to
Set the logging conditions using items
12 12
No.
Item
Specify the start
timing
Specify the stop
timing
Add detailed out-
put conditions of
data
Start trigger
Stop trigger
Condition A and
Condition B
Samples data synchronized with the high-speed scan.
Data is sampled immediately after completing execution of the DWG.H ladder
program.
Samples data synchronized with the low-speed scan.
Data is sampled immediately after completing execution of the DWG.L ladder
program.
Benefits
No data is lost.
There is no over-
head on the scan.
If the check box is selected, the timing of the start of logging is controlled
by the register status. If conditions are set in items
start when these conditions are met.
If the check box is cleared, logging will start according to manual opera-
tion of the buttons displayed on the MPE720.
If the check box is selected, the timing of the end of logging is controlled
by the register status. If conditions are set in items
stop when these conditions are met.
If the check box is cleared, logging will stop according to manual opera-
tion of the buttons displayed on the MPE720.
• If no detailed output conditions are specified: Clear the check box.
• If detailed output conditions are specified: Select the check box and
specify the conditions for items
these conditions are met. Even if logging stops because the output con-
ditions are no longer met, it will start when the conditions are met again.
Specify any S, M, G, I, or O register and numeric value, or ON/OFF.
The start condition is when the rising edge is detected (when the register
changes from OFF to ON).
The stop condition is detected by the state of the register. (If the register is
ON, the condition is always detected.)
Specify any S, M, G, I, or O register and numeric value. If both Condition A
and Condition B are specified, select one of three conditions in
12.1.1 Operating Procedure
Description
Demerits
This creates an overhead on the scan and
can cause Watchdog Errors (E.001), or
cause the CPU to go down.
If the scan setting is set to a fast rate or if
the idle time of the scan is low, logging
can fall behind or data can be missed if
there are too many data points to sample.
to
.
12 12
Description
,
, and
. Logging will start when
11 11
12 12
Continued on next page.
12.1 Data Logging
and
, logging will
11 11
and
, logging will
11 11
.
12 12
12
12-9
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Table of Contents
Troubleshooting
