Omron CS1W-LC001 Operation Manual page 24

Outline
4
Note Command execution on the Loop Control Unit is slower (0.1 to 2 second
operation cycle) than that on a CPU Unit. So, these commands are used for
programming AND and OR conditions when combining function blocks and
specifying (Remote/Local, Auto/Manual, etc.) function block operating
conditions.
Data Exchange with CPU Unit Achieved by Function Blocks
Contacts and analog data in CPU Unit I/O memory can also be read and
written constantly (at each operation cycle) by specifying the I/O numbers of
function blocks. This facilitates cooperative control in setting up and
monitoring Step Ladder Programs on the CPU Unit.
Functions to monitor or set Loop Control Unit data from standard SCADA
software have been improved. Two new function blocks, Receive All Blocks
(Block Model 462) and Send all Blocks (Block Model 461) can be used to
access Control Block (e.g., Basic PID), Operation Block (e.g., math
functions), and External Controller Block (ES100X) data in the I/O memory of
the CPU Unit using CSV tags created from the CX-Process Tool software.
I/O with Host Computer (via CPU Unit) Achieved by Function Blocks
Data can also be sent to the host computer connected on the Host Link or
the computer (on which the Controller Link Support Board is mounted)
connected on the Controller Link by designating the function block. (Note,
however, that data is only stored to the Data Memory for the Node Terminals
on the CPU Unit. Subsequent processing is dependent on accessing by FINS
commands issued from the host computer or on the Data Link with the
computer on the Controller Link.)
The contacts and analog data of the Loop Control Unit mounted on a
networked PC can also be read and written via the Controller Link by
designating the function blocks. (Note, however, that data is only stored to
the Data Memory for the Node Terminals on the CPU Unit. Subsequent
processing is dependent on the Data Link with the PC on the Controller Link.
Message Communications by FINS Commands
Data on each of the function blocks can also be read and written as desired
by issuing FINS commands by the CMND (DELIVER COMMAND) command
in the Step Ladder Program on the CPU Unit or by issuing FINS commands
from the host computer. Function block data can also be read and written
from PCs (CPU Units) on other networked nodes.
Simulated Software Wiring between Function Blocks
CX-Process Tool allows you to simulate wiring between function blocks in the
software by joining lines on your computer's screen.
Simulated Monitoring of Monitor, Graphic Monitor, and Alarms
CX-Process Monitor or SCADA software can be used to monitor the control
state and change settings on the Loop Control Unit in a screen that is similar
to a field device. CX-Process Monitor also supports graphic monitoring,
generation of trend graphs, alarm monitoring, alarm logging and operation
logging of each of the instrumentation components. Commercially available
SCADA software can also be used to create a monitoring system.
Section 1-1