Fnc156 - Zrn / Zero Return - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
20.5 FNC156 – ZRN / Zero Return
Outline
This instruction executes a zero return, and aligns the mechanical position with a present value register inside
the PLC.
When the dog search function is required, use DSZR (FNC150) instruction.
1. Instruction format
FNC 156
D
ZRN
2. Set data
Operand type
S
1
S
2
S
3
D
*1. Setting range: 10 to 32767 Hz for 16-bit operation
3. Applicable devices
Bit Devices
Oper-
and System User
Type
X Y M T C S D .b KnX KnY KnM KnS T C D R U \G
S
1
S
2
S
3
D
2
1 : "D .b" is available only in FX
available.
2 : Specify Y000, Y001 or Y002
*3
Y003 from a high-speed output special adapter
*1. Y002 is not available in 14-point and 24-point type FX
*2. High-speed output special adapters can be connected only to FX
*3. To use Y002 and Y003 with a high-speed output special adapter, connected a second high-
speed output special adapter.
Points
• When using a relay output type FX
• Outputs of special high speed output adapters work as differential line drivers.
3 : This function is supported only in FX
578
→ For explanation of the instruction, refer to the Positioning Control Edition manual.
Mnemonic
16-bit Instruction
9 steps ZRN
*1
Initial zero return speed
Creep speed [10 to 32767 Hz]
Device number for near-point signal (dog)
Device number (Y) from which pulses are to be output
Following range for 32-bit operation
Pulse output destination
FX PLC
3U
FX /FX /FX PLC Main unit (transistor output)
3G 3U 3UC
Digit Specification
1
and FX
3U
*1
transistor output from the main unit, or specify Y000, Y001, Y002
→ For cautions on using special high speed output adapters,
refer to the Positioning Control Edition manual.
Operation Condition
32-bit Instruction
Continuous
Operation
Description
Special high speed output adapter
Word Devices
Special
System User
Unit
3
3
PLCs. However, index modifiers (V and Z) are not
3UC
*2
.
3G
PLC, a special high speed output adapter is required.
3U
/FX PLCs.
3U 3UC
20 Positioning Control – FNC150 to FNC159
20.5 FNC156 – ZRN / Zero Return
Mnemonic Operation Condition
17 steps DZRN
16- or 32-bit binary
Setting range
10 to 200,000 (Hz)
10 to 100,000 (Hz)
Others
Con- Real
Index
stant Number
V Z Modify K H E
PLC.
PLC.
3U
Continuous
Operation
Data type
Bit
Charac-
Pointer
ter String
" " P
*3
or