Omron C200HX Operation Manual page 383

Cycle Time
Flowchart of CPU Unit Operation
Sets error flags and turns
ON or flashes indicator
ALARM/ERROR
ERROR
(Solid ON)
Note A minimum cycle
time can be set
either in DM 6619
of the PC Setup
or by executing
SCAN(18).
Power application
Clears IR area and
resets all timers
Checks I/O Unit connections
Resets watchdog timer
Checks hardware and
Program Memory
NO
Check OK?
Resets watchdog timer and
program address counter
Executes user program
ALARM
(Flashing)
End of program?
Minimum
cycle time?
Resets watchdog timer and waits
until the set cycle time has elapsed
Calculates cycle time
Resets watchdog timer
Refreshes input bits
and output signals
Services RS-232C port
Services Host Link
Services Peripheral Devices
Services Communications
Board
Services SYSMAC LINK and
SYSMAC NET Link Units
YES
NO
YES
NO
YES
Section 6-1
Initialization
on power-up
Overseeing
processes
Program
execution
PC
Cycle time
cycle
calculation
time
I/O
refreshing
RS-232C port
servicing
Host Link Unit
servicing
Peripheral
device
servicing
Services Com-
munications
Board
SYSMAC LINK
and SYSMAC
NET Link Unit
servicing
365