Yaskawa MP930 - Manual (Page 66)

3.2 Start and Stop Sequences
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The MP930 start sequence and basic operations are as follows:
1. Startup Self-diagnosis
The following operations are provided for startup self-diagnosis:
• Memory (RAM) read/write diagnosis
• System program (ROM) diagnosis
• Main processor (CPU) function diagnosis
• Numeric co-processor (FCPU) function diagnosis
If an error occurs in the diagnostic result, the RDY indicator will flash the specified num-
ber of times.
2. Online Self-diagnosis
The following operations are provided for online self-diagnosis:
• System program (ROM) diagnosis
• Main processor (CPU) function diagnosis
• Numeric co-processor (FCPU) function diagnosis
If an error occurs in the diagnostic result, the RDY indicator will flash the specified num-
ber of times.
3. New Operation Start
Set the operation method for “New Operation” on the CP-717 System Definition Screen.
When the system is next started, the new operation will be used to start. Unlike a continu-
ous operation start, self-diagnostic processing is performed before DWG.A is executed.
4. Continuous Operation Start
a) Set the operation method for “Continuous Operation” on the CP-717 System Defini-
tion Screen. When the system is next started, the continuous operation will be used to
start. Unlike a new operation start, no self-diagnostic processing is performed. There-
fore, the startup time for drawing execution is shortened.
b) If the RUN switch is ON (RUN) or if it turns ON (RUN) from OFF (STOP), the CPU
starts the watchdog timer and then executes DWG.A.
c) Once the execution of DWG.A has been completed, the scan is started. The initial scan
is executed only after the time for the high-speed or low-speed scan has elapsed follow-
ing the completion of DWG.A. System inputs and outputs are executed from the first
scan.
5. Operation Stop
The MP930 stops operating in the following cases:
• When the power supply is interrupted (see *1)
• When a power failure has occurred (see *1)
• When a fatal error has occurred (see *2)
• When a STOP operation has been performed from the CP-717 (see *3)
* 1. The MP930 can be restarted only by turning ON the power again.
* 2. Restart the system by turning the power ON and OFF. The cause of the error can
be ascertained by the indicator status.
* 3. Restart the system by performing a RUN operation from the CP-717.
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