Omron CJ1M-CPU21, Operation Manual

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6
Functions Listed by Purpose Section 1-3
Continued Comparisons
when Resetting Counters The comparison operation can be set to stop or continue when a high-speed
counter is reset. This enables applications where the comparison operation
can be restarted from a counter PV of 0 when the counter is reset. For the
previous version, the comparison operation stopped when the counter was
reset, requiring that the comparison operation be restarted from the ladder
program whenever resetting the counter.
1-3 Functions Listed by Purpose
1-3-1 High-speed Processing
Purpose I/O used Function Description
Execute a special process very
quickly when the correspond-
ing input goes ON (up differen-
tiation) or OFF (down
differentiation).
(For example, operating a cut-
ter when an interrupt input is
received from a Proximity Sen-
sor or Photoelectric Sensor.)
Built-in
Inputs Interrupt inputs
0 to 3 Interrupt inputs
(Direct mode) Executes an interrupt task at the rising or
falling edge of the corresponding built-in
input (CIO 2960 bits 00 to 03).
Use the MSKS(690) instruction to specify
up or down differentiation and unmask the
interrupt.
Count the input signals and
execute a special process very
quickly when the count
reaches the preset value.
(For example, stopping the
supply feed when a preset
number of workpieces have
passed through the system.)
Built-in
Inputs Interrupt inputs
0 to 3 Interrupt inputs
(Counter mode) Decrements the PV for each rising or fall-
ing edge signal at the built-in input
(CIO 2960 bits 00 to 03) and executes the
corresponding interrupt task when the
count reaches 0. (The counter can also be
set to increment up to a preset SV.)
Use the MSKS(690) instruction to refresh
the counter mode SV and unmask the
interrupt.
Execute a special process at a
preset count value.
(For example, cutting material
very precisely at a given
length.)
Built-in
Inputs High-speed
counters 0 and
1 High-speed
counter inter-
rupt (Target
value compari-
son) Executes an interrupt task when the high-
speed counter's PV matches a target
value in the registered table.
Use the CTBL(882) or INI(880) instruction
to start target value comparison.
Execute a special process
when the count is within a pre-
set range.
(For example, sorting material
very quickly when it is within a
given length range.)
Built-in
Inputs High-speed
counters 0 and
1 High-speed
counter inter-
rupt (Range
comparison) Executes an interrupt task when the high-
speed counter's PV is within a certain
range in the registered table.
Use the CTBL(882) or INI(880) instruction
to start range comparison.
Reliably read pulses with an
ON time shorter than the cycle
time, such as inputs from a
photomicrosensor. Built-in
Inputs Quick-response
inputs 0 to 3 Quick-response
inputs Reads pulses with an ON time shorter
than the cycle time (as short as 30
µ
s) and
keeps the corresponding bit in I/O memory
ON for one cycle.
Use the PLC Setup to enable the quick-
response function for a built-in input
(CIO 2960 bits 0 to 3).