Simultaneous Branch - Siemens SIMATIC S7-GRAPH Manual

Programming the Structure of the Sequencer
6.8

Simultaneous Branch

A simultaneous branch consists of more than one parallel path (a maximum of 249)
each of which starts with a step. The path are executed simultaneously. A
simultaneous branch corresponds to an AND branch.
The transition before the simultaneous branch (in the figure T1 and T7) activates
the first steps of the individual simultaneous branch paths.
Every path in a simultaneous branch ends with a step and is completed by a
successor transition.
If more than one simultaneous branch path joins to a transition, this transition only
enables the next step when all active simultaneous branch paths have been
executed.
T5
S1
T1
S2
T2
S3
T3
S4
T4
S5
T5
6-8
1 2 3
S6 S7
Tm T7
Sm
Sx
Sz
Tx
Sy
S7-GRAPH for S7 300/400 Programming Sequential Control Systems
: Simultaneous sub-branch 1
: Simultaneous sub-branch 2
: Simultaneous sub-branch 3 with a
further simultaneous branch
C79000-G7076-C526-01