10-81
10 CPU Unit Functions
CJ2 CPU Unit Software User’s Manual
10-8 Synchronous Unit
Operation
10
10-8-1 Overview
10-8 Synchronous Unit Operation
The synchronous unit operation function uses a synchronous signal that is generated by the CPU Unit
as a specified cycle to synchronize the start of processing between the CPU Units and several Syn-
chronous Units and to synchronize data exchange between these Units. Synchronous Units are CPU
Bus Units and Special I/O Units that support synchronous unit operation.
This function is supported by CJ2H CPU Units with unit version 1.1 or later.
Internal Process Synchronization
The CPU Unit can execute an interrupt task in synchronization with data exchange with Synchro-
nous Units. The Synchronous Units can use the synchronous signal from the CPU Unit to synchro-
nize the start of internal processing between all of the Units.
Data Exchange Synchronization
Data can be exchanged between the CPU Unit and multiple Synchronous Units or between Syn-
chronous Units when the synchronous signal is sent.
Precautions for Correct UsePrecautions for Correct Use
The following requirements must all be met to use the synchronous unit operation function.
• The CJ2H-CPU6@(-EIP) CPU Unit must be unit version 1.1 or later.
• The Special I/O Units and CPU Bus Units must support synchronous unit operation. (These
are called Synchronous Units.)
10-8-1 Overview
The Synchronous Unit Operation Function
CJ2 CPU Unit
(unit version 1.1 or later)
Synchronous Units
(Special I/O Units and CPU Bus Units that
support synchronous unit operation)
(1) The CPU Unit sends
the synchronous signal.
(2) Internal processing is
synchronized between the Units.
Synchronous
interrupt task
Synchronous data refreshing
Internal processing in the Units
(3) Data is exchanged on
synchronized timing.
The operation of multiple Units is
synchronized and data is exchanged.
Synchronous signal
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