Specifications

DL05 Micro PLC User Manual, 6th Edition, Rev. C
E–46
Appendix E: High-speed Input and Pulse Output Features
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External Interrupt Timing Parameters
Signal pulses at X0 must meet certain timing criteria to guarantee an interrupt will result.
Refer to the timing diagram below. The input characteristics of X0 are fixed (it is not a
programmable filtered input). The minimum pulse width is 0.1 ms. There must be some
delay before the next interrupt pulse arrives, such that the interrupt period cannot be smaller
than 0.5 ms.
Timed Interrupt Parameters
When the timed interrupt is selected, the HSIO generates the interrupt to ladder logic. There
is no interrupt “pulse width” in this case, but the interrupt period can be adjusted from 5 to
999 ms.
X Input/Timed INT Configuration
The configurable discrete input options for High-Speed Interrupt Mode are listed in the table
below. Input X0 is the external interrupt when “0004” is in V7634. If you need a timed
interrupt instead, then V7634 contains the interrupt time period, and input X0 becomes a
filtered input (uses X1’s filter time constant by default). Inputs X1, and X2, can only be
filtered inputs, having individual configuration registers and filter time constants. However,
X0 will have the same filter time constant as X1 when the timed interrupt is selected.
Independent Timed Interrupt
Interrupt O1 is also available as an interrupt. This interrupt is independent of the HSIO
features. Interrupt O1 uses an internal timer that is configured in V memory location V7647.
The interrupt period can be adjusted from 5 to 9999 ms. Once the interrupt period is set and
the interrupt is enabled in the program, the CPU will continuously call the interrupt routine
based on the time setting in V7647.
Time
Timed
Interrupt
5 ms to 999 ms
Time
External
Interrupt
X0
0.1 ms minimum
0.5 ms minimum
Input Configuration Register Function Hex Code Required
– V7647 High-Speed Timed Interrupt xxxx (xxxx = timer setting) 5- 9999 ms (BCD)
Input Configuration Register Function Hex Code Required
X0
V7634 External Interrupt 0004 (default)
Uses X1’s time setting in V7635
Filtered Input (when timed
interrupt is in use)
xxx4, xxx = INT timebase
5 - 999 ms (BCD)
X1 V7635 Filtered Input
xx06 (xx = filter time)
0 - 99 ms (BCD)
X2 V7636 Filtered Input
xx06 (xx = filter time)
0 - 99 ms (BCD)