Special instructions
1005
Part III FP Instructions
F156_STRG
Set sampling trigger
F156_STRG can be used with both sampling modes, "per Scan" and "per Time Interval".
This instruction also exists as a P instruction (for FP2/2SH, FP3/5, FP10/10SH PLC types), which
is only executed at the rising edge of the EN trigger. Select [Insert P instruction] from the
"Instructions" pane if you require a P instruction. To facilitate reuse, the instruction then appears
under "Recently used" in the pop-up menu. Press <Ctrl>+<Shift>+<v> within the programming
area to open the list of recently used elements.
Specify the sampling points using Control FPWIN Pro:
Relay contacts: 16 points
Available for (FP format): X, Y, R, L, T, C
Data: 3 words
Available for (FP format): WX, WY, WR, WL, SV, EV, DT, LD, FL
PLC types
Availability of F156_STRG (see page 1321)
Description
This instruction sets the sampling trigger that stopps the sampling after the delay specified by the
sampling trace parameters.
Example
In this example the function has been programmed in ladder diagram (LD) and structured text
(ST).The same POU header is used for all programming languages.
POU header
All input and output variables used for programming this function have been declared in the POU
header.
Body
When the variable start is set to TRUE, the function is carried out.
LD
ST
When programming with structured text, enter the following:
IF start THEN
F156_STRG();
END_IF;
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