Mitsubishi Electric MELSEC Q Series User Manual page 21

Precautions for using multiple CPU system
Precautions for using Java 7
Precautions for using dedicated instructions
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(1) Access to each CPU module at start-up of multiple CPU system
In the system in which a Web server module is mounted in the multiple CPU
system, an error may occur when accessing other CPU from the Web server
module or accessing the other station via a network module controlled by other
CPU from the Web server module due to the difference of start-up time of each
CPU module. In this case, clear the error in the Web server module after starting
up other CPU. (Refer to Section 9.3)
The start-up of other CPUs can be checked with the special relays, SM220 to
SM223. For the special relays, refer to the user's manual of the CPU module used.
(1) Security setting
When displaying the applet parts on a monitor screen or user screen using Java 7,
changing the security setting is required. (Refer to Section 3.1)
(2) User screen display
When displaying the multiple applet parts on a user screen, take corrective action
explained in Section 3.1.
(1) Dedicated instructions
When the Web server module is connected to a redundant CPU, dedicated
instructions are not executable.
If instruction execution is attempted, an "OPERATION ERROR" will occur in the
redundant CPU.
However, some of the dedicated instructions may be executable using the Web
server module functionalities.
(a) WMSEND instruction
Please consider sending E-mails by the event monitor function or the logging
function. (Refer to Section 6.6.1.)
(b) FTPPUT and FTPGET instructions
Please consider using the FTP server function. (Refer to Section 6.7.1.)
(c) TAG instruction
Please consider collecting tags by the tag setting. (Refer to Section 6.3.3.)
(d) LOG and LOGDEL instructions
Please consider logging data based on the logging setting. (Refer to Section
6.4.4.)
(2) The operation when incorrect parameters have been set may differ depending on
the CPU module. For details, refer to the user's manual of the CPU module used.
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