Counting Step Number - Mitsubishi MELSEC QS Series Programming Manual

3.6

Counting Step Number

The number of steps in basic instructions and application instructions of the safety CPU module
may increase depending on the devices to be used.
(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
In the following case, the number of steps increases over the number of basic steps.
• When a constant is used in device designation with a 32-bit instruction.
Example
Number of devices 2 Number of basic steps: 3
Number of devices 3 Number of basic steps: 4
Constant (1 step) Increases 1 step.
32-bit instruction
Constant (1 step)
Increases 2 steps.
Constant (1 step)
32-bit instruction
3.6 Counting Step Number
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