Experimental Physics and
Industrial Control System

Sorry, you lost me there.

The SNL compiler takes SNL source and produces C code. What do you mean by "the state machine is implemented in C++"?

In your original message you said that the 'camonitor' utility only shows READY -> RUNNING. So you seem to have a PV (I assume a local EPICS record) that is supposed to show the state.

In your SNL code excerpt there is no mention of such PV or when and how it is updated.

Please show all handling of that status PV in order to get feedback on it.

#define SET_PV(pv_variable, value) \
{ \
    pv_variable = value; \
    pvPut(pv_variable); \
}
%%enum { State_UNKNOWN = 0, State_NOT_READY = 1, State_READY = 2, State_RUNNING = 3, State_LOADING=4, State_UNLOADING=5, State_STARTING=6, State_STOPPING=7, State_ABORTING=8, State_ERROR=11 };
int ERROR = FALSE;

ss onsenhw {
  state S_READY {
    entry {
      SET_PV(pv_state_current, State_READY);
      ERROR = FALSE;
    }
    when(pv_state_requested == State_RUNNING) {
    } state S_STARTING
  }
  state S_STARTING {
    entry {
      SET_PV(pv_state_current, State_STARTING);
    }
    when(!ERROR && pv_allow_running) {
    } state S_RUNNING
    when(pv_state_requested == State_READY) {
    } state S_STOPPING
  }

  state S_RUNNING {
    entry {
      SET_PV(pv_state_current, State_RUNNING);
      ERROR = FALSE;
    }
   ...
  }