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CPU Unit Operation
Section 9-1
188
9-1 CPU Unit Operation
9-1-1 General Flow
The CPU Unit operation of the Ladder Engine flows as follows (excluding
when Step Run).
Note
Refer to
9-2 Cycle Time and Time
for the computer cycle time and the virtual
cycle time.
Personal
computer
cycle time
Startup
Startup (Initial) process
Overseeing processing
Computing process (UM1)
Computing process (UM2)
Virtual
cycle time
(a+b)
b
a
•
Initialize I/O memory
area/System work
area
•
Download automati-
cally from the file
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)
•
Clear I/O memory area
and check the user
memory area (UM)
•
Clear force-set/reset,
etc.
•
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.
I/O refresh
Peripheral servicing
Summary of Contents for CX-Simulator 1.9
Page 1: ...Cat No W366 E1 10 CX Simulator Ver 1 9 SYSMAC WS02 SIMC1 E OPERATION MANUAL...
Page 2: ......
Page 3: ...SYSMAC WS02 SIMC1 E CX Simulator Ver 1 9 Operation Manual Revised December 2009...
Page 24: ...xxv...
Page 30: ...xxxi...
Page 35: ...xxxvi...
Page 39: ......
Page 63: ...Comparison of the CX Simulator and SYSMAC CS CJ series PLCs Section 1 6 24...
Page 75: ...Installing and Uninstalling the Software Section 2 1 36...
Page 157: ...Task Debugging Section 4 4 118...
Page 195: ...Connection with Application Programs Section 7 2 156...
Page 225: ...Checking the Result Section 8 5 186...
Page 277: ...Other Functions Section 9 4 238...
Page 289: ...Other Tips for Troubleshooting Section 10 3 250...
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