Omron CJ1M-CPU21, Operation Manual

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Built-in Inputs Section 6-1
• Use either the CTBL(882) instruction or INI(880) instruction to start the
comparison operation.
• Use either the INI(880) instruction to stop the comparison operation.
Target Value Comparison The specified interrupt task is executed when the high-speed counter PV
matches a target value registered in the table.
• The comparison conditions (target values and counting directions) are
registered in the comparison table along with the corresponding interrupt
task number. The specified interrupt task will be executed when the high-
speed counter PV matches the registered target value.
• Up to 48 target values (between 1 and 48) can be registered in the com-
parison table.
• A different interrupt task can be registered for each target value.
• The target value comparison is performed on all of the target values in the
table, regardless of the order in which the target values are registered.
• If the PV is changed, the changed PV will be compared with the target
values in the table, even if the PV is changed while the target value com-
parison operation is in progress.
Restrictions
A comparison condition (target value and count direction) cannot appear in
the table more than once. An error will occur if a comparison condition is
specified two or more times.
Note When the count direction (incrementing/decrementing) changes at a PV that
matches a target value, the next target value cannot be matched in that direc-
tion.
Set the target values so that they do not occur at the peak or trough of count
value changes.
Range Comparison The specified interrupt task is executed when the high-speed counter PV is
within the range defined by the upper and lower limit values.
• The comparison conditions (upper and lower limits of the range) are regis-
tered in the comparison table along with the corresponding interrupt task
No. 001 No. 015 No. 000 No. 020
High-speed counter PV
Comparison is
executed without
regard to the order
of the values in the
table.
Target value 1
Target value 2
Target value 3
Target value 4
Interrupt task that is started.
Time
Comparison table
Number of values = 4
Target value 1 (Incrementing)
Interrupt task = 000
Target value 2 (Incrementing)
Interrupt task = 001
Target value 3 (Decrementing)
Interrupt task = 020
Target value 4 (Incrementing)
Interrupt task = 015
Target value 1
Target value 2
Target value 1
Target value 2
Match not recognized.
Match
Match
Match