diff -r 3cc7d6951cf4 -r 92a009dc5826 runtime/PLCObject.py
--- a/runtime/PLCObject.py	Fri Apr 26 23:08:41 2013 +0900
+++ b/runtime/PLCObject.py	Sun Apr 28 17:26:22 2013 +0900
@@ -471,7 +471,7 @@
                                 res.append(unpack_func(
                                             ctypes.cast(cursor,
                                              ctypes.POINTER(c_type)).contents))
-                                offset += ctypes.sizeof(c_type)
+                                offset += ctypes.sizeof(c_type) if iectype != "STRING" else len(res[-1])+1
                             else:
                                 if c_type is None:
                                     PLCprint("Debug error - " + iectype +