s7-graph - PLC Programming & Automation

Building a Two-Step Sequence in TIA Portal GRAPH: Transitions, Interlocks and the Step That Never Advances

The two-step sequencer in the sequence view: S1 Fill, T1, S2 Heat expanded to show its action table, interlock network, supervision network and transition T2, and the jump from T2 back to S1; below it the call from OB1 with the standard interface parameters

Step 2 of a two-step TIA Portal GRAPH sequencer on a CPU 1515-2 PN has been active for 4 minutes 12 seconds by its own S2.T, the transition below it has been satisfied for the last 40 of those seconds, and the sequencer is still sitting on step 2. The heater that step 2 drives … Read more

Sequential Function Chart PLC Programming, Step by Step

by PLC

Timing chart of SFC step activity in a batch sequence, showing Step_Fill, Step_Mix, Step_Drain and the mixer output over sixty seconds

Build a working SFC in Studio 5000: steps, transitions, action qualifiers, the SFC Execution settings that decide what happens on a restart, and S7-GRAPH.