SFC Commands and State Transitions

The modules containing SFCs in the DeltaV system have some predefined states and commands that support sequencing. The SFC can transition from one state to another depending on the commands it receives. SFCs have the following 5 states:

• IDLE

• ACTIVE

• STOPPED

• COMPLETED

• BLOCKED

The SFC also has the following predefined commands:

• Start Sequence

• Stop Sequence

• Reset Sequence

The COMMAND parameter of the SFC module reflects the commands that transition the SFC into different states. The following figure shows the state transitions and commands for SFCs: