Backup/Recovery Operations And Automatic Transfer Of Item Data - Omron SYSMAC CS1W-LCB01 Operation Manual

Description of Operation
Note
3-2-4 Backup/Recovery Operations and Automatic Transfer of ITEM
Data
RAM to flash memory
backup operation
Note
Manual for details. ITEMs that are sent or received are indicated in this
column.)
Values will not be read from the EM Area when operation is started using
a hot or cold start after downloading LCUs/LCBs for the System Common
Block or using the CX-Process Tool software.
∗2: Data to be initialized (cleared) at a cold start are the following values held
internally for operations:
Result of previous operation on time function blocks such as the First-order
Lag block or Accumulator blocks
Current measurement values of the Step Ladder Program block such as
the Timer block or Counter block
∗3: Parameters that are held in memory are all ITEMs and values held inter-
nally for operations
1. When the START mode at power ON is set to hot start, correct operation
results cannot be obtained if the power is turned ON after it has been OFF
for more than 24 hours. For this reason, use CX-Process Tool to stop run-
ning of the Loop Controller and start the Board in the cold start mode to
clear old data held internally in function blocks that was active before the
power was turned OFF.
2. All function blocks are executed at all times by turning the PLC power ON
or restarting the Loop Controller.
However, execution of some function blocks is triggered by changes in the
state of specific ITEMs for some functions, for example, in the Constant
ITEM Setting block (Block Model 171) and the Variable ITEM Setting block
(Block Model 172).
The Loop Controller will transfer (back up) the function block data in RAM to
flash memory in the following cases:
• Execution - Backup is executed from the CX-Process Tool.
• The Backup LCB Data to FROM box is checkmarked with the CX-Process
Tool before the LCB data is downloaded.
• Backup has been specified using ITEM 125 (Backup start command while
running) of the System Common Block (Block Model 000).
1. A35813 (Backup Flag) will turn ON during backup and will automatically
turn OFF once the backup has been completed normally.
2. This operation is required after downloading specific function blocks or
ITEMs or downloading only the user link table or a sequence table online
(all of these are possible while the Loop Controller is operating) if the easy
backup function is being used to backup RAM function block data in a
Memory Card in the CPU Unit. If this operation is not performed under
these conditions, the contents of the Memory Card will differ from the con-
tents of flash memory.
3. If RAM to flash memory backup is executed (i.e., the Execute/Backup com-
mand is selected) during Loop Controller operation, the Loop Controller
will continue operating while the data is being backed up.
Data can be backed up during Loop Controller operation with the following
combinations.
Section 3-2
103