Chapter 8 Troubleshooting|VP3000 
437 
 
PLC scan time fail   
(PLSF)   
PLC scan time-out during program execution 
When the PLC scan time exceeds the maximum allowable time (200 ms), PLSF 
warning shows. 
Immediately act when the error is detected 
Warning Setting Parameter 
Check if the program is correct and re-download the program. If the fault does 
not exist after re-download the program, the warning automatically clears. 
The PLC scan time exceeds the 
maximum allowable time (200 ms)   
Check if the PLC program uses excessive FOR and CALL commands, reduce 
the usage and re-download the program.