Mitsubishi Electric MELSEC Q Series User Manual page 59

3 SPECIFICATIONS
Item
Data
Sampling interval
collection
3 - 3
 When "Sampling: Execute at high speed" is selected in tag setting (control CPU only):
100 to 60000ms (total number of device points: Maximum 96)
 When "Sampling: Execute" is selected in tag setting:
1 to 32767 seconds (number of components: Maximum 4096)
1 There are some restrictions on the use of audio parts in Microsoft
7.2.6 (4).)
2 The compatible Java VM version varies depending on the serial No. of the Web server
module. (Refer to Appendix 5.1.)
3 When 64-bit Java VM is installed, install 32-bit Java VM additionally. (Uninstalling 64-bit
Java VM or overwriting is not required.)
POINT
Performance of the Web server module and the system using the Web server
module differs depending on following factors.
Conduct verification by user prior to starting the system.
 Operating environment (personal computer, network, and the CompactFlash
card)
 Loading status of the network
 Sequence scan time
 Accessing status from a personal computer, terminal display, or intelligent
function module to the programmable controller CPU.
 Accessing status to the Web server module from outside.
 Settings of the Web server module
REMARKS
(1) Number of writes for Standard ROM (Flash ROM)
Data can be written to the same area of a standard ROM up to 100,000 times
and the life of a standard ROM drive is limited as shown below.
(a) Standard ROM drive life
Life of standard ROM drive (days) = 737000/write size per day
(Example) When executing 4 logging settings in which 64 "single word"-data-
type components are to be collected at intervals of 10 seconds
LS=20+(18+1) 64+1=1237 bytes
Write size per day = 1237 (86400/10) 4 = 40.8MB
Life of standard ROM drive life = 737000/40.8MB = 18064 days =
49.5 years
LS: Write size to logging file at one time
For calculation of the size of the data written to the standard ROM drive
per day, refer to Appendix 7.1.
(b) Checking standard ROM drive usage
Used condition of a standard ROM drive can be checked by the number of
standard ROM erasure in the buffer memory area (buffer memory: 10 to
11).
When a standard ROM is erased frequently, take appropriate measures
such as stopping logging or changing the storage location of the logging file
to CompactFlash card.
Specifications
MELSEC-Q
®
VM. (Refer to Section
(MB)
3 - 3