7 Applied Instructions
7.14 Positioning Control
555
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
1
Outline
2
Instruction List
3
Configuration of
Instruction
4
How to Read
Explanation of
Instructions
5
Basic Instruction
6
Step Ladder
Instructions
7
Applied
Instructions
8
Interrupt Function
and Pulse Catch
Function
A
Relationships
between devices
and addresses
Function and operation explanation
Cautions about writing during RUN
1) Avoid writing during RUN while DRVA or DDRVA is being executed (during pulse output).
(FX
3U, FX3UC, FX3G PLCs)
If, during pulse output, writing during RUN is attempted in circuit block including this instruction, it must be
noted that the pulse output slows down and stops.
2) While DRVA or DDRVA is being executed, the following writing during RUN is prohibited.
(FX
1S, FX1N, FX1NC PLCs.)
Program change of circuit block including this instruction.
Program change of circuit block immediately before or immediately after the circuit block including this
instruction.
Addition or deletion of circuit block immediately before or immediately after the circuit block including this
instruction.
Cautions
1) When handling 32-bit data in structured program, you cannot designate 16-bit device directly unlike the
simple project.
When handling 32-bit data, please use the label.
However, the 32-bit counter is a 32-bit long device, and 32-bit data can be specified directly.
When specifying the device, use the global label.
2) Instruction driving timing (FX
1S, FX1N, FX1NC PLCs)
This is an instruction allowed to program as many times as desired, but you are advised to design the
instruction driving timing according to the following cautions.
a) Do not drive simultaneously the positioning instruction using the same output relay (Y000 or Y001).
If driven simultaneously, it is handled as double coil, and normal function is disabled.
b) After turning OFF the direction input of the instruction, drive again after the following condition is
established.
Condition: Re-driving is allowed after one operation cycle or more from the OFF moment of "pulse
output mode monitor (Y000: [M8147], Y001: [M8148]" of the positioning instruction driven
previous time.
This is because one or more OFF operation is required for re-driving of the positioning instruction.
c) We recommend the step-ladder instruction (STL) as a method of programming correctly the
positioning instruction according to the cautions mentioned above.
If, during pulse output, writing during RUN is attempted in circuit block including this instruction, it must
be noted that the pulse output slows down and stops.
3) Applicable devices are limited.
S1: <FX
3U, FX3UC, FX3G PLCs>
Please specify Y000, Y001, Y002
*1
of transistor output of basic unit, or Y000, Y001, Y002
*3
, Y003
*3
of high speed output special adapter
*2
.
*1. Y002 cannot be used in the 14-point type or 24-point type of FX3G PLC.
*2. High speed output special adapter can be connected only in FX
3U PLC.
*3. When using Y002, Y003 in high speed output special adapter, a second high speed output
special adapter is needed.
Points
• When using FX3U PLC of relay output type, high speed output special adapter is needed.
• The output of high speed output special adapter is a differential line driver.
DRVA
EN
s1
ENO
d1
d2s2
Command
input
Device for issuing pulse (Y)Number of output pulses (absolute address)
Output pulse frequency Device of rotating direction signal
DDRVA
EN
s1
ENO
Label 1
*1
d2s2
Command
input
Label 2
*2
Device for issuing pulse (Y)
Device of rotating direction signal
*1. Number of output pulses (absolute address) is defined.
*2. Output frequency pulse is defined.
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