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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
13 High Speed Processing – FNC 50 to FNC 59
13.7 FNC 56 – SPD / Speed Detection
13.7 FNC 56 – SPD / Speed Detection
Outline
This instruction counts the input pulse for a specified period of time as interrupt input.
The function of this instruction varies depending on the version.
1. Instruction format
2. Set data
3. Applicable devices
S1: X000 to X007 can be specified.
S2: This function is supported only in FX
3U/FX3UC PLCs.
Operand Type Description Data Type
Device number of pulse input (X) Bit
Time data (ms) or word device number storing the data 16- or 32-bit binary
Head word device number storing the pulse density data 16- or 32-bit binary
Oper-
and
Type
Bit Devices Word Devices Others
System User Digit Specification System User
Special
Unit
Index Constant
Real
Number
Charac-
ter String
Pointer
XYMTCSD
.b KnX KnY KnM KnS T C D R
U\G
VZModify K H E "
"P
S1
3
33333333
S
2
33 3 3 3
3333 33 3
Mnemonic Operation Condition
32-bit Instruction
13 steps DSPD
Continuous
Operation
7 steps SPD
Continuous
Operation
16-bit Instruction
Mnemonic Operation Condition
FNC 56
SPD
D
S
1
S
2
D
S
1
S
2
D