Omron CJ1W-MA - REV 10-2008, Operation Manual

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Procedure for Replacing a PCU Section 13-4
The PCU data backed up using the CPU Unit's simple backup function is
stored in the Memory Card under the following filename.
File name: BACKUP @@ .PRM
( Note: The boxes indicate the PCU's unit 10 hex)
For details on the CPU Unit's simple backup function, refer to 5-2-6 Simple
Backup Function in the CS/CJ-series Programmable Controllers Program-
ming Manual (Cat. No. W394).
Note The CPU Unit's simple backup function is used to backup or restore data for
the entire CPU Unit's system at the same time. Changing the system configu-
ration may prevent restoration of the PCU's data. To backup or restore data for
a single PCU, use the PCU's backup function as described next.
PCU's Backup
Function
The PCU has a backup function for separately transferring data that has been
saved in the PCU's internal flash memory to the Memory Card installed in the
CPU Unit using the READ BACKUP DATA Bit and WRITE BACKUP DATA Bit
in the Common Operating Memory Area.
The PCU's backup function can be executed while MECHATROLINK commu-
nications are stopped (connection released) and the Unit Busy Flag is OFF. If
this command is executed during MECHATROLINK communications, the
command will be ignored and backup will not be performed.
Writing and reading of backup data starts at the rising edge ( ) when the
WRITE BACKUP DATA Bit and READ BACKUP DATA Bit turn ON, respec-
tively, in the Common Operating Memory Area.
Common Operating Memory Area (Output)
n = CIO 1500 + (unit number
×
25)
When executing the PCU's backup function, make sure that the WRITE
BACKUP DATA Bit or READ BACKUP DATA Bit remains ON until the Unit
Busy Flag turns ON.
The Unit Busy Flag is ON while data is being transferred between the PCU
and Memory Card. When transferring data is completed, the Unit Busy Flag
turns OFF.
Common Operating Memory Area (Input)
n = CIO 1500 + (unit number
×
25)
If an error occurs in transferring data between the PCU and Memory Card
when using the PCU's backup function, the data transfer will be cancelled,
and the Memory Card Transfer Error Flag in the Common Operating Memory
Area will turn ON.
If a Memory Card Transfer Error occurs, execute UNIT ERROR RESET and
after the error is reset, execute the backup function again.
Name Word Bit Contents
WRITE BACKUP
DATA n+1 06
: Starts writing backup data
READ BACKUP
DATA 07
: Starts reading backup data
Name Word Bit Contents
Memory Card Trans-
fer Error Flag n+16 12 0: No Memory Card transfer error
1: A Memory Card transfer error has
occurred
Unit Busy Flag 14 0: PCU is not busy
1: PCU is busy