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3.8 Counting Step Number
The number of steps in CPU module sequence instructions, basic instructions, and application
instructions differs depending on whether indirect setting of the device used is possible or not.
(1) Counting the number of basic steps
The basic number of steps for basic instructions and application instructions is calculated by
adding the device number and 1.
For example, the "+ instruction" would be calculated as follows:
(2) Conditions for increasing the number of steps
The number of steps is increased over the number of basic steps in cases where a device is
used that is designated indirectly or for which the number of steps is increased.
(a) When device is designated indirectly
In cases where indirect designation is done by @ , the number of steps is increased 1
step over the number of basic steps.
For example, when a 3-step MOV instruction is designated indirectly (example: MOV
K4X0 @D0
), one step is added and the instruction becomes 4 steps.
(b) Devices with additional steps (Except Universal model QCPU)
Devices with Additional Steps Added Steps Example
Intelligent function module device
1
MOV U4\G10
D0
Multiple CPU shared device
MOV U3E1\G0 D0
Link direct device
MOV J3\B20 D0
Index register
MOV Z0 D0
Serial number access format file register
MOV ZR123 D0
32-bit constant
DMOV K123 D0
Real constant
EMOV E0.1 D0
Character string constant
For even numbers: (number of characters) / 2
For odd numbers:
(number of characters + 1) / 2
$MOV "123" D0
D0+ D10 D20
(1)(2)
(3)
Number of devices 3 Number of basic steps: 4
+ D0 D10
(1)
(2)
Number of devices 2 Number of basic steps: 3