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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
20 Positioning Control – FNC150 to FNC159
20.4 FNC155 – ABS / Absolute Current Value Read
11
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High-Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
Control
20.4 FNC155 – ABS / Absolute Current Value Read
Outline
This instruction reads the absolute position (ABS) data when the servo amplifier (equipped with the absolute position
detection function) MR-J4A, MR-J3A, MR-J2(S)A, or MR-HA is connected. The data is converted into a pulse
when being read.
→ For explanation of the instruction, refer to the Positioning Control Edition.
1. Instruction format
2. Set data
3. Applicable devices
S1: Specify a transistor output.
S2: "D.b" is available only in FX
3U and FX3UC PLCs. However, index modifiers (V and Z) are not available.
S3: This function is supported only in FX
3G/FX3GC/FX3U/FX3UC PLCs.
S4: This function is supported only in FX
3U/FX3UC PLCs.
Explanation of function and operation
Operand type Description Data type
Head device number inputting absolute (ABS) data output signal sent from servo amplifier
Three points are occupied from .
Bit
Head device number outputting absolute (ABS) data control signal to servo amplifier
Three points are occupied from .
Device number storing absolute (ABS) data (32-bit value) 32-bit binary
Oper-
and
Type
Bit Devices Word Devices Others
System User Digit Specification System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
XYMTCSD.b KnX KnY KnM KnS T C D R U\G V Z Modify K H E ""P
S2
S
1
S2
S3 S4
FNC 155
ABS
D
DABS
32-bit Instruction
13 steps
Mnemonic Operation Condition
Continuous
Operation
−
16-bit Instruction
Mnemonic Operation Condition
S
S
D
1
D
1
D
2
S
D
1
D
2
Command
input
FNC155
DABS
S
D
1
D
2