8 SFC PROGRAM
8.2 Structure
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8
Direct expression of transitions
The transition which transfers an active state to the next step can be created directly on the SFC diagram. A contact of FBD/
LD element is connected to it.
Coil, function block, function, jump, jump label, and return elements cannot be used.
Select a transition and select [Edit] [Modify] [Direct Expression for Transition] from the menu. This can
connect the FBD/LD element to the left side of the transition. (GX Works3 Operating Manual)
Transition label/device
Bit type label, bit device or Boolean value can be specified as a condition which transfer an active state to the next step.
Select a transition name, select [Edit] [Modify] [Name] in the menu, and input the bit type label, bit device
or Boolean value to be specified. (GX Works3 Operating Manual)
■Precautions
• When a device (T, ST, C or LC) of timer or counter is used for transition, the device operates as a contact (TS, STS, CS or
LCS). Also, when a coil (TC, STC, CC or LCC) of timer or counter is used, the coil operates as a contact.
• To use a coil of timer or counter for transition, use a timer type or counter type label.
Timer device and timer type label
■Bit type label ■Bit device ■Boolean value
When a timer device is used When a timer type label is used
When the contact (TS0) is on, the transition becomes TRUE.
[Direct expression]
When the contact (TS1) is off, the transition becomes TRUE.
When the coil of the timer type label (tLabel0) is on, the transition becomes TRUE.
[Direct expression]
When the coil of the timer type label (tLabel1) is off, the transition becomes TRUE.
TR3
TRUE
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