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High-speed Counter/Pulse Output Instructions Section 3-21
Flags
Precautions If the counter is reset when P is 0010 hex (high-speed counter 0) and C is
0013, 0023, or 0033 hex (sampling method for high frequency), the data read
during the sampling time when the counter was reset will not be dependable.
Examples
â– Example 1
When CIO 000000 turns ON in the following programming example,
CTBL(882) registers a range comparison table for high-speed counter 0 and
starts comparison. When CIO 000001 turns ON, PRV(881) reads the range
comparison results at that time and stores them in CIO 0100.
â– Example 2
When CIO 000100 turns ON in the following programming example, PRV(881)
reads the frequency of the pulse being input to high-speed counter 0 at that
time and stores it as a hexadecimal value in D00200 and D00201.
3-21-3 COUNTER FREQUENCY CONVERT: PRV2(883)
Purpose PRV2(883) reads the pulse frequency input from a high-speed counter and
either converts the frequency to a rotational speed or converts the counter PV
to the total number of revolutions. The result is output to the destination words
as 8-digit hexadecimal. Pulses can be input from high-speed counter 0 only.
This instruction is supported only by the CJ1M-CPU21/22/23 CPU Unit Ver.
2.0 or later.
Name Label Operation
Error Flag ER ON if the specified range for P or C is exceeded.
ON if the combination of P and C is not allowed.
ON if reading range comparison results is specified even
though range comparison is not being executed.
ON if reading the output frequency is specified for any-
thing except for high-speed counter 0.
ON if specified for a port not set for a high-speed counter.
ON if executed for a port not set for an interrupt input in
counter mode.
@CTBL
#0000
#0001
D00100
000000
@PRV
#0010
#0002
0100
000001
Range comparison table
registration and comparison star
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