Fnc 56 - Spd / Speed Detection - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
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
FNC 56
D SPD
2. Set data
Operand Type
S
1
S
2
D
3. Applicable devices
Bit Devices
Oper-
and System User
Type
X Y
1
S
1
S
2
D
1: X000 to X007 can be specified.
2: This function is supported only in FX
386
Mnemonic
16-bit Instruction
7 steps SPD
Device number of pulse input (X)
Time data (ms) or word device number storing the data
Head word device number storing the pulse density data
Digit Specification
M T C S D .b KnX KnY KnM KnS T C D R U \G
13 High Speed Processing – FNC 50 to FNC 59
Operation Condition
32-bit Instruction
Continuous
Operation
Description
Word Devices
System Special
User Unit
2
/FX PLCs.
3U 3UC
13.7 FNC 56 – SPD / Speed Detection
Mnemonic Operation Condition
13 steps DSPD
16- or 32-bit binary
16- or 32-bit binary
Others
Real
Index Constant
Number
V Z Modify K H E
Continuous
Operation
Data Type
Bit
Charac-
Pointer
ter String
" " P