Mitsubishi Electric MELIPC MI5000 Series User Manual page 82

■Memory fragmentation
Reserving and releasing memory repeatedly causes memory fragmentation, and it may result incorrect system operation.
■Restrictions on MELSEC data link functions
A path for MELSEC data link function cannot be shared among multiple tasks. A path for opening/closing a task must be
managed for each task.
■Considerations when changing a system clock rate
• A system clock rate must be changed, not with the VxWorks standard API function (sysClkRateSet), but with the C
Controller module dedicated function (CCPU_SysClkRateSet). Otherwise, the operation on VxWorks will be unstable.
■IP address setting
Set an IP address for the VxWorks part of a MELIPC from MI Configurator. If an IP address is set using a user program, the
network will not work properly.
■Considerations on interrupt service routine
A routine to execute in an interrupt service routine must be created after fully understand the specifications of VxWorks, which
is the operating system on the VxWorks part of a MELIPC. Setting incorrect value to an argument or executing a function
other than that for interrupt service routine may cause VxWorks runaway.
In a dedicated function library provided by MELIPC, C Controller dedicated functions for ISR can be used. To execute another
dedicated function synchronizing with an interrupt, implement a notification processing to a user program and execute it in a
task.
■Considerations on serial communications
To run a program for serial communications, set the communication target for serial communications to the VxWorks part
using the serial I/F switching function.
Additionally, do not perform serial communications from multiple tasks; otherwise, the program may not run properly.
9 CREATION AND REGISTRATION OF USER PROGRAMS
80
9.3 User Programs for the VxWorks Part