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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
OFF
OFF
OFF
ON
ON
ON
ON