User manual

54
• Watchdog time initialization
The watchdog elapsed time value is set to 0. (This value is the
watchdog calculation point until the next scan.)
The following illustration shows the difference between the relay
board and PLC sequence processing. The relay carries out all
sequences simultaneously while the PLC processes sequentially
throughout the program.
Processing of relay sequence
(Parallel process)
Processing of PLC program
(Serial process)