Pulse Density Measurement (Spd) - Mitsubishi MELSEC QCPU Programming Manual

6 BASIC INSTRUCTIONS

6.8.7 Pulse density measurement (SPD)

Internal Devices
Set
(System, User)
Data
Bit Word
(X only)
S
n
D
[Instruction Symbol] [Execution Condition]
SPD
[Set Data]
Set Data
S
n
D
[Functions]
(1) Input from the device designated by
n1, and results of the count are stored in the device designated by
Measurement begins
ON
Command OFF
ON
S
OFF
(2) When measurement directed by the SPD instruction has been completed, measurement is
done again from 0.
To suspend measurement directed by the SPD instruction, turn the command OFF.
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MELSECNET/10(H)
File Direct J \
Register
Bit
: Local devices and the file registers set for individual programs cannot be used.
Command
• Pulse input
• Measurement time (unit: ms)
• Head number of device which stores measurement results
n [ms]
Measurement results
stored at
QCPU
PLC CPU
Basic
High Performance
Usable Devices
Special
Function
Module
Word
U \G
SPD
S
Meaning
is counted for just the amount of time designated by
S
n [ms]
D
MELSEC-Q/QnA
QnA
Process CPU
Index
Register Constant Other
Zn
n
D
Data Type
Bit
BIN 16 bits
.
D
Measurement results
stored at
D
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Q4AR