Problem

When attempting to simulate a program in Sysmac Studio, you may come across a scenario where outputs do not appear to be updating correctly.

Have a look at the example below. 

The simulation appears to be running.

1. The color of the top of the Edit Pane changes to green.
2. The ladder run shows a green power flow through Input 1 and out to the right bus bar.
3. The Controller Status shows that we are online to the Simulator, there are no errors, and the controller is in run mode.

However the variables are not updating correctly.

• Output1 remains false.
• Even with a P_On instruction, Output_value remains at 0. This should be updated to 15. 

Solution

The reason behind this is, that at some point the Tasks' tick-box in the MultiView Explorer has been unticked. These have been highlighted below.

The tick-box is only visible while the simulation is running, or the Simulation Pane is in view (Alt + 8).

After selecting the relevant tasks you wish to simulate, the outputs will begin to update again.

Another indicator that no task has been selected, is indicated via the Simulation Pane itself. Notice that the following buttons are greyed-out, and unable to be selected:

• Continuous Step Execution.
• Step Execution.
• Execute One Scan.
• Set/Clear Breakpoint.
• Step In.

A full explanation of how the simulator works can be found in Section 7-3 of the Sysmac Studio Version 1 Operation Manual (W504).