Cautions When Using The Pulse Width Measurement Function - Mitsubishi Electric FX5 User Manual
Melsec iq-f series
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Period minimum value
The minimum value of the period is stored.
• When logic switching is set to positive logic, the difference from rising edge to rising edge.
• When logic switching is set to negative logic, the difference from falling edge to falling edge.
• The minimum value of the period can be changed only by the HCMOV/DHCMOV instruction.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
CPU module
CH1
CH2
CH3
SD5035,
SD5055,
SD5075,
SD5034
SD5054
SD5074
■Update timing, clear timing
Same as the pulse width maximum value (Page 272 Pulse width maximum value)
Cautions when using the pulse width measurement function
• When the HCMOV/DHCMOV instruction is used, the latest ring counter value, pulse width, cycle, maximum value, and
minimum value can be obtained.
• The measurement mode can be changed using the special relays. Note, however, that the measurement mode cannot be
changed during pulse width measurement. To change the measurement mode, stop pulse width measurement, change the
measurement mode and then resume measurement.
• Pulse measurement is possible only while in RUN status. Pulse width measurement is stopped by RUN→PAUSE and
RUN→STOP.
• In a program with interruption priority 1, the HIOEN/DHIOEN instruction cannot be executed to start or stop pulse width
measurement of the high-speed pulse input/output module.
• In a program with interruption priority 1, HCMOV/DHCMOV instruction specified with the following devices for the high-
speed input/output module cannot be executed.
- Period measurement complete
- Pulse width measurement complete
- Rising edge ring counter value
- Falling edge ring counter value
- Pulse width latest value
- Pulse width maximum value
- Pulse width minimum value
- Period latest value
- Period maximum value
- Period minimum value
• For functions that share inputs with the pulse width measurement function, refer to Page 248 Functions that share
inputs and outputs.
24 HIGH-SPEED INPUT/OUTPUT FUNCTION
274
24.3 Pulse Width Measurement Function
High-speed pulse input/output module
First module
CH4
CH5
CH6
SD5095,
SD5115,
SD5135,
SD5094
SD5114
SD5134
Second module
Third module
CH7
CH8
CH9
SD5155,
SD5175,
SD5195,
SD5154
SD5174
SD5194
Fourth module
CH10
CH11
CH12
SD5215,
SD5235,
SD5255,
SD5214
SD5234
SD5254
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