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6-1-2 Synchronous Operation in the Duplex System
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.
Power application
Active (ACT) CPU Unit
Standby (STB) CPU Unit
Instruction Execution Operations
Programming Device Servicing Operations
Waiting
S
Duplex switch check
S
System status check
S
CPU Bus check
Status-independent
processes
Synchronizing
Event processing
Program execution
I/O Bus check
Output refreshing
Input refreshing
SYSMAC BUS refreshing
S
Cycle time check
S
Memory check
Common processes
Waiting
Synchronizing
Waiting
S
Memory check
S
Battery check
S
Clock processing
S
Start input check
S
Duplex bus check
Common pre-processing
Duplex Synchronizing
Waiting
CPU Bus Unit servicing
Programming Device servi-
cing
Host Link servicing
Duplex initialization
Duplex refreshing
Waiting
Duplex Synchronizing
Waiting
Self-diagnosis results
Common post-processing
Programming Device Servicing Operations
S
Duplex switch check
S
System status check
S
CPU Bus check
Status-independent
processes
Synchronizing
Waiting
Synchronizing
S
Memory check
S
Battery check
S
Clock processing
S
Start input check
S
Duplex bus check
Common pre-processing
Duplex initialization
Self-diagnosis results
I
nstruction Execution Operations
Waiting
Event processing
Program execution
S
Cycle time check
S
Memory check
Common processes
Waiting
Waiting
Waiting
Waiting
Waiting
Common post-processing
Power application
PC Operation
Section 6-1
Summary of Contents for CVM1D
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