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20 Applied Instructions (Positioning Control)
20.2 DVIT / Interrupt Positioning
521
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
11
Applied Instructions
(Data Operation)
12
Applied Instructions
(High Speed
Processing)
13
Applied Instructions
(Handy
Instruction)
14
Applied Instructions
(External FX I/O
Device)
15
Applied Instructions
(External Device
(optional device))
16
Applied Instructions
(External Device)
17
Applied Instructions
(Data Transfer 2)
18
Applied Instructions
(Floating Point)
19
Applied Instructions
(Data Operation 2)
20
Applied Instructions
(Positioning
Control)
Cautions about writing during RUN
Avoid writing during RUN after either of the following operations in a circuit block including the pulse output
instruction or positioning instruction.
• Changing a program for a circuit block including a corresponding instruction.
• Changing a program for a circuit block just before or after a circuit block including a corresponding
instruction.
• Deleting or adding a circuit block just before or after a circuit block including a corresponding instruction.
This caution about the above operations is applicable to the following PLCs and instructions.
FX
1S, FX1N and FX1NC PLCs : PLSY, DPLSY, PWM, PLSR, DPLSR, ZRN, DZRN, PLSV,
DPLSV,DRVI, DDRVI, DRVA and DDRVA
FX
2N and FX2NC PLCs : PLSY, DPLSY, PWM, PLSR and DPLSR
FX
3S, FX3G, FX3GC, FX3U and FX3UC PLCs: DSZR, DVIT
*1
, DDVIT
*1
, DTBL
*2
, ZRN, DZRN, PLSV, DPLSV,
DRVI, DDRVI, DRVA and DDRVA
Note that the pulse output will decelerate and stop when writing during RUN is executed in the FX
3U or FX3UC
PLC.
*1. Not available for the FX
3S, FX3G or FX3GC PLC.
*2. Not available for the FX
3S PLC.
Function changes by version
This instruction includes the function changes as shown in the table below depending on the version.
→ As for the explanation of the instruction and contents of function changes, refer to the positioning
control manual.
Corresponding version
Item Outline of function
FX3U FX3UC
Ver. 2.20 or
later
Ver. 1.30 or
later
Interrupt input
signal designating
function
When M8336 is turned ON, the interrupt input signal corresponding to Y000 to
Y003 is changed to input number (X000 to X007) specified by D8336.
However, Y003 cannot be specified when transistor output of basic unit is used.
Ver. 2.20 or
later
Ver. 2.20 or
later
User interrupt mode
When 8 is specified by D8336 in interrupt input signal corresponding to Y000 to
Y003 and M8336 is turned ON, the interrupt input signal is changed to special
auxiliary relay. When the changed special auxiliary relay is changed from OFF
to ON by input interrupt program, the interrupt operation is started. However,
when this function is used, the logic of interrupt input cannot be inverted.
However, Y003 cannot be specified when transistor output of basic unit is used.