Yaskawa MP900 Series Ladder Programming Manual - Manual (Page 374)

7.4 Detailed Troubleshooting
7.4.5 System Errors
7-11
T
roubleshooting
7
7.4.5 System Errors
System errors can be caused by the following problems.
• Illegal processing was performed in a user program.
• A problem occurred in the installation environment.
• A hardware failure occurred.
If you are using embedded C-language programs, a system error that results in the system going down can be caused by
illegal pointer access or an illegal operation on floating-point data. The causes of system errors are given in the follow-
ing table.
∗ For details, refer to Chapter 10 Precautions in the Machine Controller MP2000 Series Embedded C-Language Pro-
gramming Package Development Guide (Manual No.: SIEP C880700 25).
If you are not using embedded C-language programs or if you are using embedded C-language programs and none of
the above illegal programming problems exist, the cause may be a hardware error.
Hardware errors can be caused by the installation environment or by failures in the hardware itself.
If there are no problems in the installation environment and the error recurs regardless of corrective actions, the hard-
ware itself may have failed. Consult with your Yaskawa representative.
Number of
Flashes of
ERR Indicator
Error Cause Corrective Action
3 times
Read address error excep-
tion
Long word (32-bit) or word (16-bit)
data was read from an incorrect
address.
*
Check for the types of illegal processing
given on the left and correct any prob-
lems.
4 times
Write address error
exception
5 times FPU exception
An illegal operation was performed for
floating-point data (not a number, divi-
sion by 0, overflow, etc.)