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8 SFC PROGRAM
8.2 Structure
Step
A step is the basic unit for comprising a block.
For the maximum number of steps that can be created per block, refer to the following.
Page 73 Specifications
Steps have the following characteristics.
• When the step becomes active, the associated action is executed.
• A step No. is assigned to each step. The step No. is used to monitor the running step or forcibly start or stop the step by
using the SFC control instruction. (Page 83 Assigning the step relay (S) areas to steps)
• Each step name and No. are unique within each block. (Each cannot be a blank.)
The step name, step No., attribute and attribute target can be changed in the Step Properties window.
Select a step, and select [Edit] [Properties] on the menu. Then, the Step Properties window will appear.
(GX Works3 Operating Manual)
(1) Step name
(2) Step No.
(3) Attribute
(4) Attribute target
(1) (2)
(3) (4)
Step0
BS
S1
BL1
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