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9 RAS FUNCTIONS
9.1 Self-Diagnostics Function
9 RAS FUNCTIONS
9.1 Self-Diagnostics Function
Checks if a problem exists with the Motion CPU.
Self-diagnostics timing
If an error occurs when the Multiple CPU system power supply is turned ON or while it is in the RUN/STOP state, the Motion
CPU detects, and displays the error, and stops operation depending on the error details.
However, depending on the error occurrence status or the instruction to execute, the Motion CPU may not be able to detect
the error. Configure safety circuits external to the Motion CPU to ensure that the entire system operates safely even in such a
case.
Error checking methods
This section describes the check methods when errors occur.
Checking by LED display
Check the following LED displays on the Motion CPU. Refer to the following for LED display details.
MELSEC iQ-R Motion Controller User's Manual
■ERROR LED
The ERROR LED is ON (or flickers).
■Dot matrix LED
The dot matrix LED displays ""AL" (flickers 3 times) "Error code" (4 digits shown 2 at a time)".
Checking by special relay, special register
The following special relays and special registers store the error content. Refer to the following for details on special relays
and special registers.
• Special relays(Page 426 Special Relays)
• Special registers(Page 431 Special Registers)
Checking by GX Works3
The error information list is checked by GX Works3 module diagnostics.
Refer to the following for details of module diagnostics.
GX Works3 Operating Manual
Device name
Special relays • Latest self diagnostics error (SM0)
• Latest self-diagnostics error (SM1)
• Warning detection (SM4)
• Detailed information 1: flag in use (SM80)
• Detailed information 2: flag in use (SM112)
Special registers • Latest self diagnostics error code (SD0)
• Clock time for latest self-diagnostic error occurrence (SD1 to SD7)
• Self-diagnostic error code (SD10 to SD25)
• Detailed information 1 information category (SD80)
• Detailed information 1 (SD81 to SD111)
• Detailed information 2 information category (SD112)
• Detailed information 2 (SD113 to SD143)
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