Omron CJ2 CPU UNIT SOFTWARE User Manual page 420

10 CPU Unit Functions
I/O Response Times for Synchronous Units
The I/O response time for a Synchronous Unit is the total of the times required for the following pro-
cesses.
(1) Inputs from external devices to Synchronous Units
(2) Synchronous input data refresh (Synchronous Units to CPU Unit)
(3) Synchronous interrupt task execution
(4) Synchronous output data refresh (CPU Unit to Synchronous Units)
(5) Internal processing in Synchronous Unit
(6) Output from Synchronous Unit to external device
The maximum I/O response time is thus two times the synchronous operation cycle time.
CPU Unit
Synchronous
Unit
(1) Input from external
device
Synchronous
Unit
(1) Input from external
device
Example for a CJ1W-NC@@4 Position Control Unit
The internal processing time is 1 ms for this Unit, so the synchronous operation cycle time must be
at least 1 ms. The I/O response time for this Position Control Unit would thus always be 2 ms.
10-86
Synchronous operation cycle
(2) Synchronous input
data refresh
Maximum I/O response time = Synchronous operation cycle time x 2
(4) Synchronous output data refresh
Synchronous operation cycle
(6) Output to external
device
(6) Output to external
device
CJ2 CPU Unit Software User's Manual