Omron SYSMAC CX-Programmer 8.1, Operation Manual

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Elements of SFC Section 2-3
52
TRANS
Any name
TRANS a
Condition met if “a” or “b” is ON
Transition Program Name
Example 2: OR bits for “a” and “b”
b
When a transition program is used as a transition condition, specify a transition
program name for the transition condition. If a conditional equation is specified with a
different Boolean variable name, than that of transition program name for the transition
condition, the program will not run properly.
b OR TRANS
Another Boolean
Variable name
TRANS a
Transition Program Name
The condition of a Boolean output that was used inside a transition program is also
retained after moving to the next step.
Ladder Program
Some instructions are not supported when defining a transition program in ladder logic.
For details, refer to 1-5-4 Ladder Language Instructions That Can Not Be Used in
Action Programs and Transition Programs .
Do not use timer instructions in a transition program. A timer that has timed out cannot
be reset in a transition program.
An END instruction is not required at the end of a ladder transition program.
ST Program
For specifications on the ST language used when defining transition programs in ST,
refer to
Part 2: Structured Text (ST) in the CX-Programmer Operation Manual Function
Blocks/Structured Text (Cat. No. W447).
Procedures:
Adding a Transition
Right-click a step, and select Add Transition .
2-3-3 Action Blocks
An action block is used to program the processes for a step.
A single step can register multiple action blocks.
An action within an action block can have the following information registered.
•
Action Qualifier (AQ)
• Action name
• Indicator Variable
An Action block is represented as shown below. In the following figure, action qualifier
(AQ), action name, and indicator variable are illustrated, from left to right.