Synchronous Operation In The Duplex System - Omron CVM1D Operation Manual

PC Operation

6-1-2 Synchronous Operation in the Duplex System

Active (ACT) CPU Unit
Power application
Instruction Execution Operations
Waiting
Event processing
Program execution
I/O Bus check
Output refreshing
Input refreshing
SYSMAC BUS refreshing
Common processes
S Cycle time check
S Memory check
Waiting
Waiting
Waiting
The active CPU and standby CPU perform synchronous processing as
shown in the following diagram. The CVM1D PCs always operate in synchro-
nous operation, asynchronous operation cannot be set in the PC Setup.
Programming Device Servicing Operations
Status-independent
processes
S Duplex switch check
S System status check
S CPU Bus check
Synchronizing
Waiting
Synchronizing
Common pre-processing
S Memory check
S Battery check
S Clock processing
S Start input check
S Duplex bus check
Duplex Synchronizing
CPU Bus Unit servicing
Programming Device servi-
cing
Host Link servicing
Duplex initialization
Duplex refreshing
Waiting
Duplex Synchronizing
Common post-processing
Self-diagnosis results
Standby (STB) CPU Unit
Power application
Programming Device Servicing Operations
Status-independent
processes
S Duplex switch check
S System status check
S CPU Bus check
Synchronizing
Event processing
Program execution
Common processes
Waiting
S Cycle time check
S Memory check
Synchronizing
Common pre-processing
S Memory check
S Battery check
S Clock processing
S Start input check
S Duplex bus check
Waiting
Duplex initialization
Common post-processing
Self-diagnosis results
Section 6-1
I
nstruction Execution Operations
Waiting
Waiting
Waiting
Waiting
Waiting
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