
157
CHAPTER 8 FUNCTIONS
8
8.15 Pulse Measurement F
unction
(2) Terminals for the pulse measurement
The following table lists the terminals that are used for the pulse measurement for each channel.
(3) Pulse width to be measured
Set which pulse width (ON or OFF) is to be measured by using "CH
Pulse measurement setting (Function input
terminal)" and "CH
Pulse measurement setting (Latch counter input terminal)".
The measured value is stored in CH
Measured pulse value (Function input terminal) (RWr1C to RWr1D, RWr34
to RWr35) or CH
Measured pulse value (Latch counter input terminal) (RWr1E to RWr1F, RWr36 to RWr37).
(4) Measurable range of the pulses
The measurable range of the pulses is between 2000 and 2147483647 (0.2ms to approx. 214s). When the input
pulses are beyond the measurable range, the error code (
660
H
or
662
H
) is stored in CH
Latest error code
(RWr22, RWr3A) and Error status flag (RXA) and the ERR. LED turns on.
To resume the measurement, input the pulses once again, or perform the operation as shown below.
*1
The abbreviations mean as the follows.
• F start command: CH
Pulse measurement start command (Function input terminal) (RY30, RY48)
• L start command: CH
Pulse measurement start command (Latch counter input terminal) (RY32, RY4A)
• F measurement flag: CH
Pulse measurement flag (Function input terminal) (RWr20.b6, RWr38.b6)
• L measurement flag: CH
Pulse measurement flag (Latch counter input terminal) (RWr20.b7, RWr38.b7)
(5) Update timing of the measured values of pulses
The measured pulse value is updated in the remote register every
Δ
T
2
cycle. So when the measurement is done
twice or more within
Δ
T
2
, only the latest measured value is stored in the remote registers. For details on
Δ
T
2
,
refer to the following.
• Internal Control Cycle and Response Delay Time (
Channel
Terminals for the pulse measurement
CH1
Function input terminal 1 (FUNC1)
Latch counter input terminal 1 (LATCH1)
CH2
Function input terminal 2 (FUNC2)
Latch counter input terminal 2 (LATCH2)
Pulse width to be
measured
Setting value of pulse
width to be measured
Description
Pulse ON width
0
The ON time of the input pulse is measured.
Pulse OFF width
1
The OFF time of the input pulse is measured.
Measurement to be resumed
Operation
Remarks
Measurement with the function input
terminal
Turn off then on the F start command.
*1
The pulse measurement is not resumed until the F
measurement flag or the L measurement flag changes
to Not operating (OFF) after the F start command or L
start command is turned off.
*1
Measurement with the latch counter
input terminal
Turn off then on the L start command.
*1
ON width
OFF width
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