Valid sequence structures

All sequence elements must be linked together:

Unattached sequence elements cannot be run. Verify that all sequence elements are linked.

Any path through the

Equipment Sequence

has to lead from the initial step to the end step:

Dead end paths stall

Equipment Sequence

execution.

Same phase cannot be placed in parallel with itself after a simultaneous divergence:

One phase cannot process two actions at the same time.

Same phase cannot be placed in parallel with itself before a simultaneous convergence:

One phase cannot process two actions at the same time.

Selective divergent paths must converge on one or more selective convergences:

Selective convergences expect one active transition linked into the branch. Multiple active transitions implies a logical error in the construction of the

Equipment Sequence

.

Simultaneous divergent paths must converge on one or more simultaneous convergences:

Simultaneous convergences expect all steps linked into the branch to be active. Inactive steps imply a logical error in the construction of the

Equipment Sequence

.