Omron CJ2 CPU UNIT SOFTWARE User Manual

10 CPU Unit Functions
10-84
CJ2 CPU Unit Software User’s Manual
Additional Information
Normal I/O refreshing is also performed between the CPU Unit and Synchronous Units. The dif-
ferences between the normal I/O refresh and the synchronous data refresh as listed in the fol-
lowing table.
The time sequence for synchronous unit operation is shown in the following diagram.
Item Synchronous data refresh Normal I/O refresh
Data exchange timing • Each synchronous operation
cycle. (The normal cycle of the
CPU Unit is interrupted to perform
synchronous data refreshing.)
• Data exchange is synchronized
with the internal processing in the
Synchronous Units.
• Each normal cycle of the CPU Unit
(after user program execution).
• The timing of the normal I/O refresh
is not related to the timing of inter-
nal processing in the Synchronous
Units.
Data exchange cycle Constant (always the specified syn-
chronous operation cycle).
Inconsistent (or minimum cycle time if
the minimum cycle time is set and the
cycle does not exceed the set time).
Start of internal process-
ing in Synchronous Units
Synchronized. Not synchronized.
10-8-2 Details on Synchronous Unit Operation
Power turned ON to PLC
CPU Unit
(1) Synchronous signal
Synchronous
Unit
Start of internal
processing
(6) Synchronous output data refresh
(2) Synchronous input
data refresh
(5) Synchronous operation cycle
(4) Synchronous
processing time
Standby
(3) Synchronous
interrupt task
Time
(5) Synchronous operation cycle
(4) Synchronous
processing time
Synchronous data initialization
Normal processing
Normal processing
Normal processing
(3) Synchronous
interrupt task
(2) Synchronous input
data refresh
Synchronous input data refresh
Synchronous input data refresh
Synchronous input data refresh
Synchronous input data refresh
Synchronous input data refresh Synchronous input data refresh
Internal processing
Internal processing
Internal processing
Internal processing
Standby
Standby
Standby
Internal processing
Internal processing Internal processing Internal processing
Synchronous
Unit
Start of internal
processing
(1)
(2)
(1)
(6)
Synchronous output data refresh
(5) Synchronous output
data refresh
(5) Synchronous output
data refresh
Synchronous output data refresh
Synchronous output data refresh
Synchronous output data refresh
Normal processing
(2) Synchronous input
data refresh

Omron CJ2 CPU UNIT SOFTWARE Specifications

General

Brand	Omron
Model	CJ2 CPU UNIT SOFTWARE
Category	Software
Language	English