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MELSEC-Q

14 DEDICATED INSTRUCTIONS

14.1 List of dedicated instructions

The dedicated instructions explained in this Chapter are listed in Table 14.1.

Table 14.1 List of dedicated instructions

Application

Dedicated
instruction

Outline of functions

Reference

Absolute position restoration

Z.ABRST1

This function restores the absolute position of the designated
axis of the QD75.

Section 14.3

Z.ABRST2
Z.ABRST3
Z.ABRST4

Positioning start

ZP.PSTRT1

This function starts the positioning control of the designated
axis of the QD75.

Section 14.4

ZP.PSTRT2
ZP.PSTRT3
ZP.PSTRT4

Teaching

ZP.TEACH1

This function carries out teaching the designated axis of the
QD75.

Section 14.5

ZP.TEACH2
ZP.TEACH3
ZP.TEACH4

Writing to flash ROM

ZP.PFWRT

This function writes the buffer memory parameters,
positioning data and block start data to the flash ROM.

Section 14.6

Parameter initialization

ZP.PINIT

This function initializes the buffer memory and flash ROM
setting data to the factory-set data (initial values).

Section 14.7

14.2 Interlock during dedicated instruction is executed

The absolute position restoration instruction (Z.ABRST ), positioning start instruction

(ZP.PSTRT ) and teaching instruction (ZP.TEACH ) cannot be executed
simultaneously in each axis. If they are executed at the same time, the second and
later instructions are ignored by an internal interlock (no error will occur).

The timing of the positioning start dedicated instruction (ZP.PSTRT ) is as shown

below.

ZP.PSTRT instruction ON

Interlock provided by CPU module

BUSY (XC to XF)

Positioning completed (X14 to X17)

OFF