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19 BUILT-IN I/O FUNCTION
19.3 Pulse Width Measurement Function
177
19
List of special relays/special registers
The list of special relays/special registers used in pulse width measurement is shown below.
R/W: Read or write (Note, however, that only writing is allowed for the HCMOV instruction.)
R: Read only
Special relays/
special
registers
Function Description Default R/W
SM5020 CH1 pulse width measurement
status flag
The measurement in progress/measurement stopped status of
pulse width measurement on the target channel can be checked
by these flags.
OFF: Measurement stopped
ON: Measurement in progress
OFF R
SM5021 CH2 pulse width measurement
status flag
SM5022 CH3 pulse width measurement
status flag
SM5023 CH4 pulse width measurement
status flag
SM5036 CH1 rising edge flag These flags turn ON at the end of the 1st period measurement on
the target channel. (They remain ON during measurement in the
always measurement mode.)
OFF R
SM5037 CH2 rising edge flag
SM5038 CH3 rising edge flag
SM5039 CH4 rising edge flag
SM5052 CH1 falling edge flag These flags turn ON at the end of the 1st pulse width
measurement on the target channel. (They remain ON during
measurement in the always measurement mode.)
OFF R
SM5053 CH2 falling edge flag
SM5054 CH3 falling edge flag
SM5055 CH4 falling edge flag
SM5068 CH1 measurement mode The measurement mode of the target channel can be checked by
these flags. (To change the measurement mode during operation,
use this special relay.)
OFF: Always measurement mode
ON: 1 time measurement mode
ON R/W
SM5069 CH2 measurement mode
SM5070 CH3 measurement mode
SM5071 CH4 measurement mode
SD5021, SD5020 CH1 rising edge ring counter value The ring counter value when the rising edge is detected is stored. 00000000H R/W
SD5023, SD5022 CH1 falling edge ring counter value The ring counter value when the falling edge is detected is stored. 00000000H R/W
SD5025, SD5024 CH1 pulse width latest value The latest value of the pulse width is stored. 00000000H R/W
SD5027, SD5026 CH1 pulse width maximum value The maximum value of the pulse width is stored. 00000000H R/W
SD5029, SD5028 CH1 pulse width minimum value The minimum value of the pulse width is stored. FFFFFFFFH R/W
SD5031, SD5030 CH1 period latest value The latest value of the period is stored. 00000000H R/W
SD5033, SD5032 CH1 period maximum value The maximum value of the period is stored. 00000000H R/W
SD5035, SD5034 CH1 period minimum value The minimum value of the period is stored. FFFFFFFFH R/W
SD5041, SD5040 CH2 rising edge ring counter value The ring counter value when the rising edge is detected is stored. 00000000H R/W
SD5043, SD5042 CH2 falling edge ring counter value The ring counter value when the falling edge is detected is stored. 00000000H R/W
SD5045, SD5044 CH2 pulse width latest value The latest value of the pulse width is stored. 00000000H R/W
SD5047, SD5046 CH2 pulse width maximum value The maximum value of the pulse width is stored. 00000000H R/W
SD5049, SD5048 CH2 pulse width minimum value The minimum value of the pulse width is stored. FFFFFFFFH R/W
SD5051, SD5050 CH2 period latest value The latest value of the period is stored. 00000000H R/W
SD5053, SD5052 CH2 period maximum value The maximum value of the period is stored. 00000000H R/W
SD5055, SD5054 CH2 period minimum value The minimum value of the period is stored. FFFFFFFFH R/W
SD5061, SD5060 CH3 rising edge ring counter value The ring counter value when the rising edge is detected is stored. 00000000H R/W
SD5063, SD5062 CH3 falling edge ring counter value The ring counter value when the falling edge is detected is stored. 00000000H R/W
SD5065, SD5064 CH3 pulse width latest value The latest value of the pulse width is stored. 00000000H R/W
SD5067, SD5066 CH3 pulse width maximum value The maximum value of the pulse width is stored. 00000000H R/W
SD5069, SD5068 CH3 pulse width minimum value The minimum value of the pulse width is stored. FFFFFFFFH R/W
SD5071, SD5070 CH3 period latest value The latest value of the period is stored. 00000000H R/W
SD5073, SD5072 CH3 period maximum value The maximum value of the period is stored. 00000000H R/W
SD5075, SD5074 CH3 period minimum value The minimum value of the period is stored. FFFFFFFFH R/W
SD5081, SD5080 CH4 rising edge ring counter value The ring counter value when the rising edge is detected is stored. 00000000H R/W
SD5083, SD5082 CH4 falling edge ring counter value The ring counter value when the falling edge is detected is stored. 00000000H R/W
SD5085, SD5084 CH4 pulse width latest value The latest value of the pulse width is stored. 00000000H R/W