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10-4. Interruption [EI], [DI], [IRET]
XD/XL series PLC have interruption function, including external interruption and timing
interruption. By interruption function we can deal with some special programs. This function
is not affected by the scan cycle.
10-4-1．External Interruption
The input terminals X can be used to input external interruption. Each input terminal
corresponds with one external interruption. The input’s rising/falling edge can activate the
interruption. The interruption subroutine is written behind the main program (behind FEND).
After interruption generates, the main program stops running immediately, turn to run the
correspond subroutine. After subroutine running ends, continue to execute the main program.
Note: The external interruption of XC series PLC cannot be activated by rising edge
and falling edge at the same time; but XD/XL series PLC supports rising edge and
falling edge activation meantime.
XD1/XD2/XD3/XD5/XL1/XL3 series 16 I/O
XD1 series 32 I/O, XD2/XD3 series 24/32/48/60 I/O, XD5 series, XDM series,
XDC series, XD5E series, XDME series, XL5 series, XL5E, XLME series
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