Omron CQM1H - 08-2005 - Page 55

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Functions Listed by Purpose Section 1-4
Interrupt functions Processing interrupt
when an input turns ON
Example: Cut-to-length
processing (sending
instruction to a tool
when interrupt input is
received from a
proximity or
photoelectric sensor)
CPU Unit
(built-in inputs)
Input interrupts (4
inputs): Input
Interrupt Mode
Input interrupt
permitted by
clearing mask
using the INT(89)
instruction with
CC=000.
Interrupt subroutine is executed
when CPU Unit built-in input
(IR 00000 to IR 00003) turns ON.
Processing interrupts at
regular intervals
Example: Sheet speed
calculation (calculates
speed using input
signals from an encoder
at regular intervals)
Interval timer
interrupt:
Scheduled
Interrupt Mode
Specified with the
first operand of the
STIM(69) instruc-
tion.
Interrupt subroutine is executed
at regular intervals.
Processing interrupt
after a fixed time
Example: Stopping
conveyor belt with high
precision after
workpiece detected
(independent of cycle
time)
Interval timer
interrupt: One-shot
Mode
Three interval
timers (0 to 2).
(Interval timer 2
cannot be used at
the same time as
high-speed
counter 0.)
Specified with the
first operand of
STIM(69).
Interrupt subroutine is executed
once when the time expires.
Processing interrupt
when the PV of a
low-speed (1 kHz)
counter reaches 0
Example: Counting
workpieces (e.g., chip
components), and
stopping feeding when
a set value is reached
Input interrupts (4
inputs): Counter
Mode
(decrementing)
Counter Mode set
value updated and
masking cleared
using the INT(89)
instruction with
CC=003.
Decrements the PV every time
CPU Unit built-in input (IR 00000
to IR 00003) turns ON, and
executes the subroutine when the
PV reaches 0.
Processing interrupt
when the high-speed
counter PV matches a
certain value
Example: Performing
processing required for
cutting a workpiece
(e.g., wire) when it is a
certain length
CPU Unit
(built-in inputs)
Pulse I/O Board
Absolute
Encoder
Interface Board
High-speed
counter interrupt:
Target value
comparison
Interrupt subroutine is executed
when the PV matches a value
registered in the comparison
table.
Processing interrupt
when the high-speed
counter PV is within a
certain range
Example: Picking
workpieces (e.g., wires)
within specified lengths
at high speed
High-speed
counter interrupt:
Range comparison
Interrupt subroutine is executed
when the counter PV lies
between set upper and lower
limits.
Interrupting program
when data is received
via serial
communications
Serial
Communica-
tions Board
Protocol macro
interrupt
notification
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Purpose Unit/Board Function Details