Omron SYSMAC CP CP1E-N@@D@-@ - Manual (Page 451)

4-3
4 Monitoring and Computing the Cycle Time
CP1E CPU Unit Instructions Reference Manual(W483)
4-2
Com
pu
ting
th
e Cyc
le Tim
e
4
4-2-1 C
P
U
Unit Ope
ration
Flo
wchar
t
4-2 Computing the Cycle Time
The CPU Unit processes data in repeating cycles from the overseeing processing up to peripheral
servicing as shown in the following diagram.
4-2-1 CPU Unit Operation Flowchart
Power ON
Check OK?
End of program?
Sets error flags
Calculates cycle time
I/O refresh
I/O refresh
Peripheral servicing
NO
YES
Error
Normal
Checks Unit connection status
Checks hardware and user
program memory
ERR/ALM
indicator ON or
flashing?
Flashing (non-
fatal error)
Lit (fatal error)
Star
tup initialization
Ov
erseeing processing
Prog
ram e
x
ecution
Cycle time calculation
PLC cycle time
P
e
ripher
al
ser
vicing
User program executed
Cyclic task executed
Waits until the set cycle time
has elapsed (when the
minimum cycle time is valid)