High−level Instructions
3 − 563
A maximum of approx. 174.7 ms can be measured in 1us unit.
A maximum of approx. 49.7 days can be measured in 1ms unit.
Period measurement data
When measurement starts, −1 is set.
When measurement limit is exceeded, −1 is set.
Precautions during programming
The same channel cannot be specified at the same time with other high−speed counter control instructions
<F165(CAM0), F166(HC1S), F167(HC1R)>.
An exclusive control is implemented by the high−speed counter control flags (R9110 to R9115).
Once the instruction is executed, the pulse measurement function will be effective until the control is cleared
with F0(MV) S, DT90052 instruction.
The number of channels that the instruction can be executed simultaneously is two.
F178 instruction cannot be executed if the high−speed counter function is not used.
Do not execute this instruction in the normal program and the interrupt program at the same time.
FP0R
High−speed counter
channel No.
Control flag Elapsed value area Target value area
ch0 R9110 DT90300 to DT90301 DT90302 to DT90303
ch1 R9111 DT90304 to DT90305 DT90306 to DT90307
ch2 R9112 DT90308 to DT90309 DT90310 to DT90311
ch3 R9113 DT90312 to DT90313 DT90314 to DT90315
ch4 R9114 DT90316 to DT90317 DT90318 to DT90319
ch5 R9115 DT90320 to DT90321 DT90322 to DT90323
Example of input pulse measurement setting
[Condition]
(1) Set the channel number to 0 and the number of moving average to 5. Specify the pulse period
measurement in 1us unit.
(2) Set the counting period to 10ms.
F0 MV , H 150, DT100
R9013
F178 PLSM, DT100, DT101, DT200
R3
Specification of high−speed counter channel 0,
No. of moving average: 5 times, specification of pulse period measurement (in 1us unit)
Period of counting the number of pulses
Start of input pulse measurement
F0 MV , K 10, DT101
Execution of program
When the internal relay R3 is ON, the operation is performed as follows.
When pulses are input with a freuqency at 10kHz.
DT200 to DT201 No. of pulses (Moving average value) → 100 pulses
Calculates the number of input pulses every 10ms,
and
calculates the average of the past 5 times with a
period of counting.
DT202 to DT203 Pulse period in 1us unit → 100 μs
(The value is k100.)
DT204 to DT205 Pulse period in 1ms unit → Becomes 0 ms.
Note: The final numbers of actual measured values may vary due to measurement error.
FP0R
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