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PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
9 One-speed Interrupt constant quantity feed -DVIT Instruction
9.1 Instruction Format
B - 123
A
Common Items
B
Built-in
Positioning
Functions
Apx.
Example
Connection
9. One-speed Interrupt constant quantity feed -DVIT
Instruction
The built-in positioning function uses the Interrupt Positioning (DVIT) instruction to perform one-speed
interrupt constant quantity feed. If an FX
3UC PLC Ver.1.30 or later is used, this instruction can change the
interruption signal input destination.
If an FX
3U/FX3UC PLC Ver.2.20 or later is used, the interruption signal can be controlled with a user program.
The FX
3G PLC does not support the interrupt positioning (DVIT) instruction.
→ For items to be observed in programming, refer to Section 4.7.
9.1 Instruction Format
1. Instruction Format
2. Data setting
*1. Setting range : -32,768 to +32,767 (excluding 0) for 16-bit operation
: -999,999 to +999,999 (excluding 0) for 32-bit operation
*2. Setting range : 10 to 32,767 Hz for 16-bit operation
For 32-bit operation, however, the setting range should be as shown in the following
table.
Operand type Description Data type
Specifies the number of pulses (relative address) to be output after interruption.
*1
BIN16/32-bit
Specifies the output pulse frequency.
*2
Specifies the pulse output number.
Bit
Specifies the rotation direction signal output destination device number.
Pulse output destination Setting range
FX
3U PLC High-speed output special adapter 10 to 200,000(Hz)
FX
3U/FX3UC PLC Main unit (transistor output) 10 to 100,000(Hz)
FNC 151
DVIT
DRIVE INTERRUPT
D
16-bit
instruction
9 steps
DVIT
-
Continuous
execution
type
Instruction
symbol
Execution condition
32-bit
instruction
Instruction
symbol
Execution condition
DDVIT
-
Continuous
execution
type
17 steps
Command
input
FNC 151
DVIT
S
2
•
S
1
•
D
1
•
D
2
•
S
1
S
2
D
1
D
2