Chapter 18 Testing and Debugging Tools A function block diagram in the program monitoring mode is shown below. An instruction list in the program monitoring mode is shown below. A structured text in the program monitoring mode is shown below. A sequential function chart in the program monitoring mode is shown below. Not only the sequential function chart itself is monitored, but also the actions and the transitions are monitored. Action0 and Action1 are being executed. STEP_0 is ON. Action 2 is not executed. Time for which STEP_0 has been executed * The time for which a step in a DVP series PLC has been executed is not displayed STEP_1 is OFF. 18-5