12.5 Sampling Trace Function
12.5.1 Overview
The FP-X control unit Ver2.0 and later versions support the sampling trace function.
Using this function enables to take samplings and record (accumulate) the state of arbitrary data of 16
bits + 3 data registered in the PLC at an arbitrary timing, and to examine the changes in the bit and data
in details after stopping sampling at an arbitrary timing.
The sampling trace function is used in the time chart monitor function under the online menu of the
FPWIN-GR.
The instructions, functions, special relays and special registers related to the sampling trace
function are as below.
F155(SMPL) sampling instruction
F156(STRG) sampling stop trigger instruction
Time charge monitor of FPWIN GR
R902C
: Sample point flag
OFF=Sampling by instruction
ON=Sampling at regular time intervals
R902D
: Sampling trace end flag
When sampling trace starts=0 stops=1
R902E
: Sampling trigger flag
Turns on when sampling stop trigger is on.
R902F
: Sampling enable flag
Turns on when sampling operation starts.
DT90028
: Interval of sampling trace
k0=For sampling by instruction
k1 to k3000 (10ms to 30 seconds) For sampling at regular time intervals
12.5.2 Details of Sampling Trace Function
No. of data collectable at one sampling: 16 bits +3 data
Sampling capacity (No. of samples accumulable) : C14=300 samples
: C30/C60=1000 samples
Types of sampling timing (When an instruction is executed, or at regular time intervals)
1: Sampling at regular time intervals From 10 ms
2: Sampling by F155(SMPL) instruction
Sampling for every scan can be executed by the instruction.
Also, more than one samplings can be executed in one scan.
Timing for the execution of the F155(SMPL) instruction can be set by the ladder sequence.
Note:
It is not possible to activate the sampling at regular time intervals and the sampling by the
F155(SMPL) instruction simultaneously.
How to stop sampling
Methods of the stop trigger (request): Following two methods are available.
1. Deactivate request by the tool software
2. Deactivate request by the F156(STRG) instruction
If the stop trigger activates, the PLC will continue to take samplings for the specified No. of delay, and
then stop the sampling operation. Once the sampling operation stops, the data will be automatically
retrieved by the tool software and will be indicated in a time chart.
It is possible to adjust whether to see before or after the trigger point by the setting of the No. of delay.
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