Sampling Of Target Data - Mitsubishi MELSEC Q series User Manual

6.2

Sampling of Target Data

Select a sampling interval and timing from the following items. ( Page 115, Section 8.4.4)
Each scanning cycle
Time
specification
Each multiple CPU high speed transmission cycle
Condition
specification
*1 The LCPU does not support this item.
(1) Each scanning cycle
Data are collected in the END processing of each scan.
Scan time
0
Program
END processing
(2) Time specification
Data are collected at the specified time intervals. The setting range is as follows:
• Millisecond: 1 to 32767 (in increments of 1ms)
• Second: 1 to 86400 (in increments of 1s)
*1 In the following cases, scan time will be extended and a watchdog timer error will occur. Pay attention to the sampling
interval and timing or the time spent for one data logging processing.
 Short sampling interval, and many data logging executions per scan
 Large volume of data to be collected, and long data logging processing time
50
Setting item
Sample data at the first END processing after the specified time
has elapsed
Samples data at the specified time interval.
• When the bit of the bit device rises
• When the bit of the bit device falls
• When the word device value meets
Device specification
the specified value
• When the word device data is
changed
• Always
• When execution condition is ON
Step No. specification • When execution condition is OFF
• When execution condition rises
• When execution condition falls
Scan time
END 0 END
END processing
Sampling
*1
*1
Scan time
0 END 0
END processing
Sampling Sampling
Description
Data are collected in the END processing of each scan.
Specify the time of sampling interval. Data are collected in
the END processing after the specified time has elapsed.
Specify the time of sampling interval. Data are collected at
the specified time intervals.
Data are collected in synchronization with the multiple
CPU high speed transfer cycle in a multiple CPU system
where the multiple CPU high speed transmission function
is used.
Data are collected when the specified device condition is
met in the END processing of each scan.
Data are collected during execution of the specified step
and when the specified condition is met.
Scan time Scan time
END 0
END processing
Sampling
END
END processing
Sampling