AutomationDirect DL105, User Manual

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High
-S
peed
Input
and
Pulse
O
utput
Features
3--45
High-Speed Input and Pulse Output Features
DL105 PLC User Manual, 3rd Edition
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.
Time
External
Interrupt
X0
0.1 mS minimum
0.5 mS minimum
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.
Time
Timed
Interrupt
5 mS to 999 mS
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, X2, and X3 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.
Input Configuration
Register
Function Hex Code
Required
X0 V7634 External Interrupt 0004
Uses X1’s code
in V7635
Filtered Input (when timed
interrupt is in use)
0054 to 9994, which is
the timed INT timebase
X1 V7635 Filtered Input xx06 (xx = filter time)
X2 V7636 Filtered Input xx06 (xx = filter time)
X3 V7637 Filtered Input xx06 (xx = filter time)
External Interrupt
Timing Parameters
Timed Interrupt
Parameters
X Input / Timed
INT Configuration