Chapter 5 Positioning Instruction; Common Items; Operand Specification Method; Start Speed - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

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POSITIONING INSTRUCTION
This chapter explains positioning instructions that are used in the positioning function.
For the expression and execution type of the applied instruction, refer to MELSEC iQ-F FX5 Programming Manual
(Instructions, Standard Functions/Function Blocks).
5.1

Common Items

This section explains the common items in the positioning instruction. For auxiliary functions, refer to Page 33 Auxiliary
Function.

Operand specification method

The operand specification method includes two types: FX5 operand and FX3 compatible operand. The operand setting differs
depending on the specification method. The items that cannot be set through operands positioning instruction follow the
setting values of the positioning parameters. (Page 41 POSITIONING PARAMETER)
The FX3 compatible operand is supported only in CPU module.
The DDSZR, DRVTBL, DRVMUL, and DABS instructions have only one operand specification method.

Start speed

The start speed of instructions for specifying positioning addresses and table operation control methods, except for the PLSY/
DPLSY instruction, PLSV/DPLSV instruction, and table operation instruction (control method: [4: Variable Speed Operation] or
[5: Table Transition Variable Speed Operation]), is calculated by the following equation:
• Start speed = (Maximum speed - Bias speed) ÷ Acceleration time
The start speed varies as follows, depending on the command speed and bias speed:
• Bias speed < Start speed < Command speed: Start speed = Start speed (the value from the equation above)
• Bias speed < Command speed < Start speed: Start speed = Command speed
• Start speed < Bias speed, or Command speed < Bias speed: Start speed = Bias speed
For the PLSV/DPLSV instruction and table operation instruction (control method: [4: Variable Speed Operation] or [5: Table
Transition Variable Speed Operation]), the following equations are used instead of those above:
• Acceleration time = 0: Start speed = Command speed
• Acceleration time  0: Start speed = Bias speed
5 POSITIONING INSTRUCTION
5.1 Common Items
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