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CHAPTER5 MEMORIES AND FILES USED FOR CPU MODULE
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5.1 Memories Used for CPU Module
5.1.2 Program memory
5.1.2 Program memory
(1) Definition
This memory is for storing programs and parameters for CPU module operation.
The CPU module transfers a program from the program memory to the program cache memory for
operation. ( Section 5.1.3)
If the total size of data to be stored exceeds the program memory capacity:
• reduce the user setting system area, or
• transfer data other than programs to the standard ROM or memory card.
(2) Before using the program memory
Format the program memory by GX Developer.
(a) Formatting
Select [Online] [Format PLC memory] in GX Developer.
Select "Program memory/Device memory" in “Target memory”.
(b) Creating a user setting system area
When formatting a program memory, set the capacity of user setting system area.
1) Do not create a user setting system area (the necessary system area only)
The user setting system area is not created during formatting.
2) Create a user setting system area
The user setting system area is created during formatting.
Table5.3 provides the type of user setting system area.
Figure 5.2 Formatting the program memory
Table5.3 Type of user setting system area
System area
Description
High speed monitor area from
other station.
Setting this area increases the monitoring speed in the GX Developer connected to such as
a serial communication module.
When using RS-232 and USB together with GX Developer, this area is used to register
monitor data from GX Developer connected to such as a serial communication module.