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3 CONFIGURATION OF INSTRUCTIONS
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.
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:
(1) 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 @
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 where number of steps increases
Devices Where Number of Steps
Intelligent function module
device/special function module
device
Link direct devices
Serial number access file registers
32-bit constants
Real number constant
Character string constant
(c) In cases where the conditions described in (a) and (b) above overlap, the number of steps
becomes a culmination of the two.
For example, if MOV U1\G10 ZR123 has been designated, 1 step is added for buffer
register designation and 1 step is added for serial number access file register designation,
making a total of 2 steps added.
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+
D0
1
+
D0
R0
1
2
Increases
For even numbers:
(number of characters)/2
For odd numbers:
(number of characters + 1)/2
R0
Indicates the number of devices
2
3 steps
D10
3
4 steps
Added Steps
1
MELSEC-Q/QnA
, the number of steps is increased
Example
MOV U4\G10 D0
MOV J3\B20 D0
MOV ZR123 D0
DMOV K123 D0
EMOV E0.1 D0
$MOV "123" D0
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