10-87
10 CPU Unit Functions
CJ2 CPU Unit Software User’s Manual
10-8 Synchronous Unit
Operation
10
10-8-3 Synchronous Unit Operation Specifications
10-8-3 Synchronous Unit Operation Specifications
Item Specification
Applicable CPU Units CJ2H-CPU6@(-EIP) CPU Units with unit version 1.1 or later
Special I/O Units and CPU
Bus Units that can be used
as Synchronous Units
CJ1W-NC@@4 Position Control Units
Number of mountable Syn-
chronous Units
10 Units max.
5 Units max. for CJ1W-NC@@4 Position Control Units
Mounting location for Syn-
chronous Units
Synchronous Units must be mounted on the CPU Rack. (They will not function if
mounted on an Expansion Rack.)
Synchronous operation
cycle time
0.5 to 10 ms (in 0.1-ms increments)
Set in the PLC Setup.
The following conditions must be met:
• The synchronous processing time must be less than the synchronous operation
cycle time.
• The internal processing time of a Synchronous Unit must be less than the syn-
chronous operation cycle time.
Maximum variation in syn-
chronous operation cycle
time
10 µs
I/O memory area for syn-
chronized data exchange in
CPU Unit
The Synchronous Data Refresh Area is separated into two sections, one for input
data from the Synchronous Units to the CPU Unit and one for output data from the
CPU Unit to the Synchronous Units. The Synchronous Data Refresh Area is from
CIO 1200 to CIO 1295. The contents depends on the Synchronous Units.
Task number of synchronous
interrupt task
Interrupt task number 2 must be used.
Synchronous unit operation can be used without using the synchronous interrupt
task.
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