Items To Be Observed In Programming; Positioning Instruction Activation Timing - Mitsubishi FX3G Series User Manual

FX /FX /FX PLC User's Manual - Positioning Control Edition
3G 3U 3UC
Built-in Positioning Functions
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.
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.
DSZR(FNC150)
DVIT(FNC151)
TBL(FNC152)
ABS(FNC155)
ZRN(FNC156)
PLSV(FNC157)
DRVI(FNC158)
DRVA(FNC159) Drive to Absolute
: 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
Turning this instruction OFF will turn the servo amplifier OFF
*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
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.
Pulse output destination device
B - 68
→ 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.
Description
Zero return instruction with
DOG search function
Interrupt Positioning
*2
(interruption fixed-feed)
Positioning by batch setting
method
Current ABS value read-out
*1
from servo amplifier
Zero return (without DOG
search function)
Variable speed Pulse Output
Drive to Increment
*1
only once.
and FX PLCs.
3U 3UC
"Pulse output monitor" flag
Y000
Y001
*1
Y002
*2
Y003
4.7 Items To Be Observed in Programming
Instruction to be used
DVIT
DSZR TBL ABS
*2
*1
.
→ For examples of programs, refer to Chapter 12.
M8340
M8350
M8360
M8370
4 Before Programming
ZRN PLSV DRVI DRVA