Watlow LogicPro - Manual (Page 91)

LogicPro User’s Guide Chapter 7: Sequential Function Charts
Doc.# 28002-00 Rev 3.00 Watlow Anafaze 75
Parallel (AND) and Single (OR) Transitions
To toggle between parallel and single Transitions, using the
[Simultaneous Transition] tool, double-click near the
directed link on the opposite side of the double horizontal line
from the Transition.
Parallel horizontal lines indicate that steps occur in parallel.
For example, in the SFC as illustrated in Figure 7.2, both
Steps 2 and 3 will execute in parallel once condition 1 is met.
Figure 7.2 Parallel and / or Single Transitions
A single horizontal line indicates that only one step executes.
For example, in Figure 7.3, either Step 2 or Step 3 will
become active depending on whether condition 1 or condition
2 becomes true. In case both Transition conditions become
true at the same time, Step 2 will become active because logic
is executed top to bottom, left to right.
Figure 7.3 Simultaneous Transition
Conditions