Monitoring device for programmable controller

A monitoring device for a programmable controller, the monitoring device being configured to display, on a display device, an operation state of the programmable controller configured to execute a program described to include a plurality of steps each indicative of an individual control process and a transition indicative of a transition condition between the plurality of steps, the monitoring device being comprising:

• a display portion configured to read states of execution flags stored in the programmable controller as flags indicative of respective execution states of the plurality of steps and to display, on the display device, a step that is being executed by the programmable controller among the plurality of steps in such a manner that the step is distinguishable from the other steps;
• a receiving portion configured to receive selection of a step serving as an initial point of reactivation from among the plurality of steps in a case where halfway stop occurs during a continuous operation in which control processes of the plurality of steps are continuously executed by the programmable controller from an upstream side to a downstream side;
• and
• a change instruction generation portion configured to generate, to the programmable controller, a change instruction to change the states of the execution flags in order to cause the programmable controller to restart the execution of the control processes from the step received by the receiving portion, at a time of the reactivation.