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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

PSTRT1
PSTRT2
PSTRT3

Positioning start

PSTRT4

This function starts the positioning control of the designated
axis of the QD75MH.

Section 14.4

TEACH1
TEACH2
TEACH3

Teaching

TEACH4

This function carries out teaching the designated axis of the
QD75MH.

Section 14.5

Writing to flash ROM

PFWRT

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

Section 14.6

Parameter initialization

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 positioning start instruction (PSTRT ) and teaching instruction (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 (PSTRT ) is as shown below.

PSTRT instruction ON

Interlock provided by PLC CPU

BUSY (XC to XF)

Positioning completed (X14 to X17)

OFF