Omron CS1W-LC001 Operation Manual page 112

Description of Operation
3-2-7-1 When executing all function blocks at a common operation cycle
3-2-7-2 When executing a specific function block at a specified operation cycle
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Basically 1, the default operation cycle (ITEM004) of all function blocks is the
system common operation cycle. (In other words, the operation cycle of each
function block is interlocked with the value set at ITEM004 of the System
Common block.) The default system common operation cycle (ITEM004) of
the System Common block (Block Model 000) is one second.
To change the system common operation cycle to a value other than one
second, set one of the following values to the system common operation
cycle (ITEM004) of the System Common block (Block Model 000).
1: 0.1 sec, 2: 0.2 sec, 3: 0.5 sec, 4: 1 sec, 5: 2 sec (default is 4: 1 sec)
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1: As an exception, 0 (system common operation cycle) and 5 (2 sec)
cannot be set only in ITEM004 (operation cycle) of the following function
blocks:
Rate-of-change Operation and Alarm (Block Model 113)
Analog Signal Hold (Block Model 118)
Moving Average (Block Model 145)
Ramp Program (Block Model 155)
Segment Program (Block Model 156)
Note Before changing ITEM004 (system common operation cycle) of the System
Common block (Block Model 000), be sure to stop running of the Loop
Control Unit, and then resume running of the Unit in the cold start mode.
Otherwise, the Unit does not function normally.
Common to each block (system common operation
cycle)
Block
When changing the operation cycle of a specific function block, change
ITEM004 (operation cycle) of the respective function block to one of 1: 0.1
sec, 2: 0.2 sec, 3: 0.5 sec, 4: 1 sec or 5: 2 sec from the default "0: common to
each block."
In this way, you can set the operation cycle of each function block to any one
of five groups (0.1 sec, 0.2 sec, 0.5 sec, 1 sec or 2 sec) (six groups if the
system common operation cycle is included). Operation cycle settings of
specific function blocks can co-exist with the system common operation
cycle. This means that certain function blocks can execute at the system
common operation cycle, while other groups can execute at another
operation cycle, for example, 0.1 seconds.
Block
Section 3-2