Chapter 4. CPU module
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4.6 Memory Configuration
The CPU module includes two types of memory that are available by the user. One is program memory which is used
to store the user programs written to implement a system by the user. The other is data memory which stores data
during operation.
1) Program memory configuration
The table given below shows the contents to be stored and the storage capacity of program memory.
Item
Memory Capacity
Overall program memory area
68 k bytes
Parameter area
•
Basic parameter area
•
I/O parameter area
•
High speed link parameter area
•
Interrupt setting information area
2 k bytes
Program area
•
Scan program area
•
Task program area
•
User defined function/function block area
•
Standard library area
•
Access variable are
•
Variable initialization information area
•
Protective variable specification information area
66 k bytes
2) Data memory Configuration
The table given below shows the contents to be stored and the storage capacity of program memory.
Item
Memory Capacity
Overall data memory area
32 k bytes
System area
•
I/O information table
•
Force I/O table
1 k bytes
System flag area
1.5 k bytes
Input image area (%IX)
128 bytes
Output image area (%QX)
128 bytes
Direct variable area (%M)
2 to 8 k bytes
Symbolic variable area (maximum)
29 k bytes – the size of direct variable
area
Stack area
3 k bytes
