10-95
10 CPU Unit Functions
CJ2 CPU Unit Software User’s Manual
10-8 Synchronous Unit
Operation
10
10-8-7 PLC Setup
Settings for the synchronous unit operation function are made in the Synchronous Unit Operation Set-
tings Area of the Timings/Synchronous Tab Page from the CX-Programmer.
z Use Synchronous Operation
This check box is used to enable and disable the synchronous unit operation function.
z Synchronous Cycle Time
Set the synchronous operation cycle time.
Precautions for Correct UsePrecautions for Correct Use
The following conditions must be met for the synchronous operation cycle time.
• 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 synchronous cycle
time.
Generally speaking, set the synchronous operation cycle time to 1.5 times the synchronous pro-
cessing time or higher.
10-8-7 PLC Setup
Parameter Settings Default Description
Related Auxiliary
Area bits and
words
Use Synchro-
nous Operation
Cleared: Not used.
Selected: Used.
Cleared (not used) Select the check box to use
synchronous unit operation.
If using the synchronous
unit operation function is
enabled, the high-speed
interrupt function will be
unconditionally enabled.
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Parameter Settings Default Description
Related Auxiliary
Area bits and
words
Synchronous Cycle
Time
0.5 to 10.0 ms
(in increments of
0.1 ms)
2.0 ms Set the synchro-
nous operation cycle
time.
A10102 (Synchro-
nous Operation
Cycle Time)