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