Omron CJ - 08-2008 Operation Manual page 108

Function Tables
Purpose
Managing the Reducing the cycle time.
Cycle Time
Setting a fixed (minimum)
cycle time.
• Variations in I/O
response times can be
eliminated by suppress-
ing processing variations.
Setting a maximum cycle
time.
(Generating an error for a
cycle time exceeding the
maximum.)
Reducing the I/O response
time for particular I/O
points.
Finding I/O refresh times
for individual Units
Studying the I/O response
time
Finding the increase in the
cycle time for online editing
60
Function
• Use tasks to put parts of the pro-
gram that don't need to be executed
into "standby" status.
• Use JMP(004) and JME(005) to
jump parts of the task that don't
need to be executed.
• Convert parts of the task to subrou-
tines if they are executed only under
particular conditions.
• Disable a Unit's Special I/O Unit
refreshing in the PLC Setup if it isn't
necessary to exchange data with
that Special I/O Unit every cycle.
• Setting index and data registers to
be shared by all tasks when these
registers are not being used.
Set a minimum cycle time in the PLC
Setup.
Set a maximum cycle time (watch
cycle time) in the PLC Setup. If the
cycle time exceeds this value, the
Cycle Time Too Long Flag (A40108)
will be turned ON and PLC operation
will be stopped.
Use immediate refreshing or
IORF(097).
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Section 1-8
Manual Reference
Programming 6-1 Cycle
Manual Time/High-
(W394) speed Pro-
cessing
7-1 PLC
Operation
Setup
Manual
Programming 6-1 Cycle
Manual Time/High-
(W394) speed Pro-
cessing
Parallel
Operation
Processing
Manual
Mode (CJ-H
CPU Units
Only)
10-4-6 I/O
Response
Time
10-4-5
Online Edit-
ing Cycle
Time Exten-
sion