Memories And Files Of Q24Dhccpu-Vg; Memory Type - Mitsubishi Electric MELSEC Q Series User Manual

18.2

Memories and files of Q24DHCCPU-VG

The following describes the available memories and files that can be stored in Q24DHCCPU-VG.
18.2.1

Memory type

The following memories are available.
• System ROM............................................. Page 318, (1) in this section
• Internal ROM............................................. Page 318, (2) in this section
• Standard ROM .......................................... Page 318, (3) in this section
• Work RAM/RAM disk ................................ Page 319, (4) in this section
• Battery backup RAM/Standard RAM ........ Page 319, (5) in this section
• SD memory card ....................................... Page 320, (6) in this section
• USB device ............................................... Page 320, (7) in this section
• CPU shared memory ................................ Page 321, (8) in this section
• Data refresh memory ................................ Page 321, (9) in this section
(1) System ROM
A system ROM is a memory that stores system software and VxWorks image files required for operations of the C
Controller module.
Only read-out from FTP, Telnet and user programs is allowed.
(2) Internal ROM
An internal ROM is a memory that store parameters.
Use the following functions in Setting/monitoring tools for the C Controller module to read/write parameters.
•
[Online]  [Read from CCPU]/[Write to CCPU]
Access from FTP, Telnet and user programs is not allowed.
Initialization (Page 62, Section 6.1) restores the initial parameter values.
(3) Standard ROM
A standard ROM is a memory that store files such as user programs.
Access from FTP, Telnet and user programs is allowed.
Since a standard ROM is a flash ROM, write count (life) is limited.
For the procedures to check the life and writing frequency of a standard ROM, refer to the following.
Page 137, Section 9.4
318