Omron CS1W-LC001 Operation Manual page 138

Exchanging Data with the CPU Unit
120
Note The CPU Unit Terminal or Expanded CPU Unit Terminal differs from each
other in the following respect besides the number of input/output points.
Category
CPU Unit Data is input at all times from
terminal the CPU Unit at each operation
cycle, and contact or analog
data is output at all times.
Á
Expanded
CPU Unit
terminal
Á
Category
CPU Unit Contact data is input from the
terminal CPU Unit, and is output to the
"contact input" ITEM of
another function block via the
Contact Distributor block
(Block Model 201) or the Step
Ladder Program block (Block
Model 301).
Expanded Contact data is input from the
CPU Unit CPU Unit, and is output
terminal directly to the "contact input"
ITEM of another function block
without going via the Contact
Distributor block (Block Model
201) or the Step Ladder
Program block (Block Model
301).
Category
CPU Unit Analog data is input from the
terminal CPU Unit and analog data is
output.
Á
Á
Expanded Analog data is input from the
CPU Unit CPU Unit, and the
terminal parameter ITEMs of another
function block are output
with the destination
specified directly without
going via the Variable ITEM
Setting block (Block Model
172).
Data exchange timing
DI, AI terminals
When the "write at all times
switch" is 0 (OFF):
Data is input from the CPU
Unit at all times at each
operation cycle, and that
data is written to ITEMs of
other function blocks only
when the state of the CPU
Unit I/O memory has
changed.
When the "write at all times
switch" is 1 (ON):
Data is input from the CPU
Unit at all times at each
operation cycle, and is
written to ITEMs of other
function blocks at all times.
DI terminals
AI terminals
Either that analog data is
input at the analog input
source designation on
another function block,
Or that analog data is
output to a parameter
ITEM of another function
block via the Variable
ITEM Setting block (Block
Model 172).
Section
DO, AO terminals
Contact or analog data is input
at all times at each operation
cycle, and is output to the CPU
Unit at all times.
Á
When the "write at all times
switch" is 0 (OFF):
Contact or analog data is
input at all times at each
operation cycle, and that data
is output to the CPU Unit only
when that data has changed.
Á
When the "write at all times
switch" is 1 (ON):
Contact or analog data is
input at all times at each
operation cycle, and that data
is output to the CPU Unit at
all times.
DO terminals
The "contact output" or "contact
input" ITEMs of another function
block are input via the Contact
Distributor block (Block Model
201) or the Step Ladder Program
block (Block Model 301), and the
contact data is output to the CPU
Unit.
The "contact output" or "contact
input" ITEMs of another function
block are specified as the source
designation directly without going
via the Contact Distributor block
(Block Model 201) or the Step
Ladder Program block (Block
Model 301), and the contact data
is output to the CPU Unit.
AO terminals
"Analog output" or "analog
input" of another function blocks
is input at the analog input
source designation, and that
analog data is output to the
CPU Unit.
"Analog output" or "analog
input" of another function block
or parameter ITEMs are input
with the analog input source
designation specified, and that
analog data is output to the
CPU Unit.
3-3