User manual

High-Speed Input and
Pulse Output Features
3--43
High-Speed Input and Pulse Output Features
DL105 PLC User Manual, 3 rd Edition
Mode 40: High-Speed Interrupts
The HSIO Mode 40 provides a high-speed interrupt to the ladder program. This
capability is provided for your choice of the following application scenarios:
S An external event needs to trigger an interrupt subroutine in the CPU.
Using immediate I/O instructions in the subroutine is typical.
S An interrupt routine needs to occur on a timed basis which i s different
from the CPU scan time (either faster or slower). The timed interrupt is
programmable, from 5 to 999 mS.
The HSIO circuit creates the high-speed interrupt to the CPU. The following diagram
shows the external interrupt option, which uses X0. In this configuration, X1, X2, and
X3 are all normal filtered inputs.
Output Circuit
Input Circuit
CPU
PLC
DL105
X0
Y0, Y1
X4 -- X11
Y2 -- Y7
V-memory
V7633
xx40
Mode Select
I/O data
HSIO
Interrupt
X1, X2, X3
Interrupt
FILTER
Alternately, you may configure the HSIO circuit to generate interrupts based on a
timer, as shown below. In this configuration, inputs X0 through X3 are filtered inputs.
Output Circuit
Input Circuit
CPU
PLC
DL105
Y0, Y1
X4 -- X11
Y2 -- Y7
V-memory
V7633
xx40
Mode Select
I/O data
HSIO
Timer
X0, X1, X2, X3
Interrupt
Interrupt
FILTER
Purpose
Functional Block
Diagram