--- a/targets/plc_common_main.c	Tue Dec 15 14:40:45 2009 +0100
+++ b/targets/plc_common_main.c	Tue Dec 15 15:35:02 2009 +0100
@@ -84,7 +84,7 @@
 
 
 void PLC_GetTime(IEC_TIME *CURRENT_TIME);
-void PLC_SetTimer(long long next, long long period);
+void PLC_SetTimer(unsigned long long next, unsigned long long period);
 
 #define CALIBRATED -2
 #define NOT_CALIBRATED -1