Mitsubishi Electric MELIPC MI5000 Series User Manual page 110

■File names and folder names
File names and folder names used in the VxWorks part
Use the following characters for file names and folder names stored on the VxWorks part.
• Uppercase alphanumeric characters
*1 If lowercase alphanumeric characters are used, the number of storable files may decrease from the maximum value.
Special character (.)
Do not use the special character (.) for a folder name.
If the special character (.) follows usable character codes, it is not included in the folder name. Furthermore, folder names that
use only the special character (.) cannot be created.
(Example: A folder named 'A' is created when the folder name is configured to 'A...'. )
If a file name is composed of lowercase characters, it may be displayed all in uppercase characters when
viewed from FTP or Telnet.
■Disabling synchronous control when writing data to a user drive (/ROM)
Normally, synchronous control is performed when writing data to a user drive (/ROM). By disabling the synchronous control,
high-speed writing may be achieved.
• However, depending on the amount of data to be written or writing frequency, the rate for high-speed writing
differs.
• This increases the speed for writing data by the operations on VxWorks part or a user program, as well as
from the Windows part or an external device that uses a function such as the file sharing server function or
FTP function.
To enable/disable synchronous control, run the following commands in a script file, user program, or using Telnet before start
writing to a folder in the user drive (/ROM).
• To disable synchronous control
romfd = open("/ROM",2,666)
ioctl(romfd,21,0)
close(romfd)
romfd = open("/ROM",2,666)
ioctl(romfd,65,0)
close(romfd)
• To enable synchronous control
romfd = open("/ROM",2,666)
ioctl(romfd,21,0)
close(romfd)
romfd = open("/ROM",2,666)
ioctl(romfd,65,0x00010000)
close(romfd)
Precautions
Before disabling synchronous control when writing data, read the following considerations. Not doing so may result in system
file corruption.
• After starting the process for disabling synchronous control, do not perform any of the following operations until the
synchronous control is enabled next time.
Turning OFF or resetting the product
Shutting down the product
Executing the C Controller dedicated function (CCPU_ShutdownRom)
• Do not write data to the user drive (/ROM) during the process for disabling or enabling synchronous control. If there is a
possibility that data will be written to the user drive (/ROM) by a task of a user program, do not perform the process for
disabling or enabling synchronous control. Additionally, do not write parameters from MI Configurator during the process for
disabling or enabling synchronous control since it leads to writing to the user drive (/ROM).
APPX
108
Appendix 1 Product Configuration
*1
and special characters (excluding \, /, *, ?, <, >, :, ¦, ", and $)