diff -r 984c51d1bf6b -r 3757f0de0d07 PLCControler.py
--- a/PLCControler.py	Thu Sep 15 22:29:32 2011 +0200
+++ b/PLCControler.py	Tue Sep 20 23:58:31 2011 +0200
@@ -2562,7 +2562,7 @@
             for task in tasks:
                 new_task = plcopen.resource_task()
                 new_task.setname(task["Name"])
-                if task["Single"] != "":
+                if task["Triggering"] == "Interrupt":
                     new_task.setsingle(task["Single"])
 ##                result = duration_model.match(task["Interval"]).groups()
 ##                if reduce(lambda x, y: x or y != None, result):
@@ -2575,7 +2575,7 @@
 ##                    if result[-1] is not None:
 ##                        values.append(int(float(result[-1]) * 1000))
 ##                    new_task.setinterval(datetime.time(*values))
-                if task["Interval"] != "":
+                if task["Triggering"] == "Cyclic":
                     new_task.setinterval(task["Interval"])
                 new_task.setpriority(int(task["Priority"]))
                 if task["Name"] != "":
@@ -2598,12 +2598,12 @@
                 new_task = {}
                 new_task["Name"] = task.getname()
                 single = task.getsingle()
-                if single:
+                if single is not None:
                     new_task["Single"] = single
                 else:
                     new_task["Single"] = ""
                 interval = task.getinterval()
-                if interval:
+                if interval is not None:
 ##                    text = ""
 ##                    if interval.hour != 0:
 ##                        text += "%dh"%interval.hour
@@ -2620,6 +2620,12 @@
                     new_task["Interval"] = interval
                 else:
                     new_task["Interval"] = ""
+                if single is not None and interval is None:
+                    new_task["Triggering"] = "Interrupt"
+                elif interval is not None and single is None:
+                    new_task["Triggering"] = "Cyclic"
+                else:
+                    new_task["Triggering"] = ""
                 new_task["Priority"] = str(task.getpriority())
                 tasks_data.append(new_task)
                 for instance in task.getpouInstance():