Omron SYSMAC CS1W-LCB01 Operation Manual page 52

Outline
Analog I/O or Contact I/O
Note
Data Exchange with
Specified CPU Unit I/O
Memory
Note
18
Analog signals or contact signals are input and output constantly (at each
operation cycle) between the Analog I/O Unit or Basic Unit on the same PLC
and the CPU Unit I/O memory. At this time, the user is not required to be
aware of I/O memory addresses as the Field Terminal block is used.
With analog I/O, only the unit number of the Analog I/O Unit is set. With con-
tact I/O, however, the leading allocated address in I/O memory must be set.
Analog Input Unit
At each I/O
refresh
At each I/O
refresh
Analog Output Unit
The Loop Controller uses the Field Terminal block (regardless of the user pro-
gram on the CPU Unit) to read and write areas allocated for contact or analog
signals. So, do not perform write operations on the same allocated areas
between the Loop Controller and the CPU Unit.
I/O operations can be performed internally on the Loop Controller constantly
(at each operation cycle) with any specified CPU Unit I/O memory. In this
case, the CPU Unit Terminal block or the Expanded CPU Unit Terminal block
is used, and the I/O memory address must be specified.
Data exchange is possible with the following I/O memories:
• CIO (channel I/O) Area
• Work Area (W)
• Holding Area (H)
• Data Memory (D)
• Extended Data Memory (E) bank No. 0
1. This function can also be used to designate Units (DeviceNet, Compo-
Bus/S and other Communications Units) on which field terminals are not
supported, and CPU Unit I/O memory (remote I/O allocated area, etc.) for
enabling I/O.
CPU Unit
I/O memory
At each
operation
cycle
At each
operation
cycle
CPU Unit Loop Controller
Field Terminal
I/O memory
block
At each
opera-
tion
cycle
At each
opera-
tion
cycle
Loop Controller
CPU Unit Terminal block
or Expanded CPU Unit
Terminal block
Section 1-1