Chapter 18 Memories And Files; Memories And Files Of Q24Dhccpu-V; Memory Type - Mitsubishi Electric MELSEC Q Series User Manual

CHAPTER 18
This chapter describes the memories handled by the C Controller module and files that can be stored.
18.1

Memories and files of Q24DHCCPU-V

The following describes the available memories and files that can be stored in Q24DHCCPU-V.
18.1.1

Memory type

The following memories are available.
• System ROM ............................................ Page 309, (1) in this section
• Internal ROM ............................................ Page 309, (2) in this section
• Standard ROM .......................................... Page 309, (3) in this section
• Work RAM/RAM disk ................................ Page 310, (4) in this section
• Battery backup RAM/Standard RAM ........ Page 310, (5) in this section
• SD memory card ....................................... Page 311, (6) in this section
• USB device ............................................... Page 311, (7) in this section
• CPU shared memory ................................ Page 312, (8) in this section
• Data refresh memory ................................ Page 312, (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
MEMORIES AND FILES

CHAPTER 18 MEMORIES AND FILES

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