FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
4 Before Programming
4.7 Items To Be Observed in Programming
B - 79
A
Common Items
B
Built-in
Positioning
Functions
Apx.
Example
Connection
4.7 Items To Be Observed in Programming
This section describes various programming items that will not be affected by any pulse output destination
devices (hardware).
For information on the pulse output destination devices (hardware) that are affected by programming items,
refer to the following sections.
For use of the transistor output of the main unit, refer to Section 4.8.
For use of the high-speed output special adapter, refer to Section 4.9.
4.7.1 Positioning Instruction Activation Timing
The following positioning instructions can be programmed as many times as needed. However, observe the
items shown in the following table to determine the instruction activation timing.
For details on the each instructions, refer to Chapter 6 to 11.
: If the pulse output destination device is now outputting pulses, the instruction cannot be activated. Refer
to the "Note" below.
: For the absolute position detection system, activate the ABS (FNC155) instruction after turning the
power ON for the servo amplifier. After executing this instruction, the current value will be read out from
the servo amplifier only once.
Turning this instruction OFF will turn the servo amplifier
OFF.
Caution:
If the "pulse output monitor" (BUSY/READY) flag is on, and if a positioning instruction (excluding the ABS
instruction) or pulse output instruction (PLSR, PLSY) specifies the same pulse output destination device as
the one being used, the instruction cannot be executed.
Even after turning the instruction activation contact OFF, if the "pulse output monitor" (BUSY/READY) flag is
still on, do not execute a positioning instruction (including the PLSR and PLSY instructions) for an output with
the same output number.
Before activating such an instruction, check that the "pulse output monitor" (BUSY/READY) flag is off, and
then wait until 1 cycle or more of operation has been completed.
For examples of programs, refer to Chapter 12.
*1. Y002 is not available in FX
3G PLC (14-point and 24-point type) and FX3S/FX3GC PLC.
*2. Y003 is available only when two high-speed output special adapters are connected to the FX
3U PLC.
Description
Instruction to be used
DSZR
DVIT
TBL ABS ZRN PLSV DRVI DRVA
Instruction to be used
DSZR(FNC150)
Zero return instruction with
DOG search function
DVIT(FNC151)
Interrupt Positioning
(interruption fixed-feed)
TBL(FNC152)
Positioning by batch setting
method
ABS(FNC155)
Current ABS value read-out
from servo amplifier
ZRN(FNC156)
Zero return (without DOG
search function)
PLSV(FNC157) Variable speed Pulse Output
DRVI(FNC158) Drive to Increment
DRVA(FNC159) Drive to Absolute
Pulse output destination device "Pulse output monitor" flag
Y000 M8340
Y001 M8350
Y002
*1
M8360
Y003
*2
M8370
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