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The loop ( ) format is as follows.
For example,loop (number of loops) // Defines the temporary address that stores the number of loops.
{
script expression
break // Optional. Use to exit the loop partway through.
} endloop // Defines the end of the loop -
(number of loops) Only a temporary Word Address can be entered in the brackets. (For example, loop ([t:0000]))
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"loop ( )" cannot be used in a trigger equation.
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The temporary Word Address value used to define the number of loops decreases for every loop. When the value changes to 0, the loop operation ends. If the temporary Word Address value defined for the number of loops is modified, the loop could become endless. The temporary Word Address used is designated as Global. Therefore, simultaneously using this temporary Word Address for other purposes could result in an infinite loop.
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Until a loop operation completes, screen displays of Parts and so on are not updated or refreshed.
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loop ( ) can also be nested. When it is nested, the "break" keyword will skip the innermost loop ( ).
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If loop operation ends without using the escape command, the temporary Word Address value becomes 0.
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The range available for the temporary Word Address value differs depending on the data format (Bin, BCD), bit length, and code +/- used. If code +/- has been set and the temporary Word Address becomes a negative value, the condition is judged at the beginning of the loop and the loop processing stops.
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DO NOT use a PLC device in the loop formula. Instead, use the display unit's internal user area devices or a temporary work address.
For example, the following description performs data write to the PLC many times in a short period (100 times in the following example). This can cause a system error since communication processing (the time required to write to the PLC) cannot be performed at this speed.
For example,[t:0000] = 100 // 100 loops
loop ([t:0000])
{
// Write to D0200
[w:[PLC1]D0200] = [w:[#INTERNAL]LS0100]
// Increment LS0100
[w:[#INTERNAL]LS0100] = [w:[#INTERNAL]LS0100] + 1
}endloop -
Please change as follows:
[t:0000] = 100 // 100 loops
loop ([t:0000])
{
// Write to D0200
[w:[#INTERNAL]LS0200] = [w:[#INTERNAL]LS0100]
// Increment LS0100
[w:[#INTERNAL]LS0100] = [w:[#INTERNAL]LS0100] + 1
}endloop
// Write contents of LS0200 to D0200
[w:[PLC1]D0200]=[w:[#INTERNAL]LS0200] -
Using the keywords "loop" or "break" in D-script function names will cause an error.