Cpu Unit Operation; General Flow - Omron CS Series Operator's Manual

CPU Unit Operation

9-1 CPU Unit Operation

9-1-1 General Flow

Personal
computer
cycle time
184
AUDIN - 8, avenue de la malle - 51370 Saint Brice Courcelles - Tel : 03.26.04.20.21 - Fax : 03.26.04.28.20 - Web : http: www.audin.fr - Email : info@audin.fr
The CPU Unit operation of the Ladder Engine flows as follows (excluding
when Step Run).
Startup (Initial) process
Overseeing processing
a
Computing process (UM1)
Computing process (UM2)
b
Virtual
cycle time
(a+b)
Peripheral servicing
Refer to 9-2 Cycle Time and Time for the computer cycle time and the virtual
Note
cycle time.
Startup
I/O refresh
Section 9-1
· Initialize I/O memory · Clear I/O memory area
area/System work and check the user
area memory area (UM)
· Download automati- · Clear force-set/reset,
cally from the file etc.
memory
· Monitor the DIP
switch
· Back up I/O memory
areas
· Execute the ladder diagram for applications
· Run process: Execute the user program
· Error process: Clear the I/O memory area
when an error occurs (excluding when executing
a FALS)
· Execute the ladder diagram for debugging
· Run process: Execute the user program
· Error process: Clear the I/O memory area
when an error occurs (excluding when executing
a FALS)
The CX-Simulator does not execute I/O refresh.
However, the virtual I/O refresh time is added to the
cycle time in the virtual cycle time.
The CX-Simulator does not execute peripheral
servicing excluding for the network communications
unit, the Serial Communications Boards/Unit, and
file service.