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Using File Memory Section 5-3
Replacing the Program during Operation
1,2,3... 1. Insert a Memory Card into the CPU Unit. (Already initialized.)
2. Write the Program Password (A5A5 Hex) in A651 and the Program File
Name in A654 to A657.
3. Turn the Replacement Start Bit (A65015) from OFF to ON.
Simple Backup Function There are 3 backup operations: backing up data to the Memory Card, restor-
ing data from the Memory Card, and comparing data with the Memory Card.
Backing Up Data from the CPU Unit to the Memory Card
1,2,3... 1. Insert a Memory Card into the CPU Unit. (Already initialized.)
2. Turn ON pin 7 on the CPU Unit’s DIP switch.
3. Press and hold the Memory Card Power Supply Switch for three seconds.
4. Verify that the MCPWR Indicator flashes once and then goes OFF. (Other
changes indicate that an error occurred while backing up the data.)
Restoring Data from the Memory Card to the CPU Unit
1,2,3... 1. Insert the Memory Card containing the backup files into the CPU Unit.
2. Turn ON pin 7 on the CPU Unit’s DIP switch.
3. The backup files will be restored when the PLC is turned ON.
4. Verify that the MCPWR Indicator flashes once and then goes OFF. (Other
changes indicate that an error occurred while restoring the data.)
Comparing Data in the Memory Card and CPU Unit
1,2,3... 1. Insert the Memory Card containing the backup files into the CPU Unit.
2. Turn OFF pin 7 on the CPU Unit’s DIP switch.
3. Press and hold the Memory Card Power Supply Switch for three seconds.
4. The data matches if the MCPWR Indicator flashes once and then goes
OFF.
Note The following table lists the benchmark execution times for the simple backup
operation. These times were measured under the following conditions, with
different PLC Unit configurations.
CPU Unit: Unit version 4.0
User program: 20 Ksteps
Cycle time in RUN mode: 10 ms
Configuration: CPU Unit only
Configuration: CPU Unit + 1 Serial Communications Unit (See note 1.)
Operating
mode
Writing to Memory Card Comparing with
Memory Card
Reading
from
Memory
Card
PROGRAM
mode
Approx. 20 s Approx. 15 s Approx. 10 s
RUN mode Approx. 1 min Approx. 30 s Approx. 10 s
Operating
mode
Writing to Memory Card Comparing with
Memory Card
Reading
from
Memory
Card
PROGRAM
mode
Approx. 50 s Approx. 25 s Approx. 20 s
RUN mode Approx. 1 min 40 s Approx. 1 min 30 s Approx. 20 s
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