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PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
4 Before Programming
4.7 Items To Be Observed in Programming
B - 70
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.
→ To use the transistor output of the main unit, also refer to Section 4.8.
→ To use the high-speed output special adapter, also 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.
3: 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
*1
only once.
Turning this instruction OFF will turn the servo amplifier
OFF
*1
.
*1. The ABS (FNC155) instruction can be used with the absolute position detection system of the
MELSERVO-J3, -J2(S), and -H Series.
*2. Only available for FX
3U and FX3UC PLCs.
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.
Description
Instruction to be used
DSZR
DVIT
*2
TBL ABS ZRN PLSV DRVI DRVA
Instruction to be used
DSZR(FNC150)
Zero return instruction with
DOG search function
333 3333
DVIT(FNC151)
*2
Interrupt Positioning
(interruption fixed-feed)
333 3333
TBL(FNC152)
Positioning by batch setting
method
333 3333
ABS(FNC155)
Current ABS value read-out
from servo amplifier
*1
ZRN(FNC156)
Zero return (without DOG
search function)
333 3333
PLSV(FNC157) Variable speed Pulse Output 333 3333
DRVI(FNC158) Drive to Increment 333 3333
DRVA(FNC159) Drive to Absolute 333 3333
Pulse output destination device "Pulse output monitor" flag
Y000 M8340
Y001 M8350
Y002
*1
M8360
Y003
*2
M8370