User`s manual

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MELSEC-Q
14 ERROR CODE
14 ERROR CODE
This chapter describes the definitions of the errors that will occur in the QnPHCPU and the
compensation operation to be taken for the errors.
14.1 Error code list
There is the following process control instruction error.
• Error occurred midway through operation Error code: 4100
When an operation error occurs (error code: 4100), a detailed error code is stored into SD1502
and SD1503.
• SD1502: Error code that occurred in process control instruction
• SD1503: Processing number of corresponding instruction where error occurred
If "OPERATION ERROR (error code: 4100)" occurred in the process control instruction, confirm
its details in the above special registers.
Table 14.1 Error Codes That Occurred in Process Control Instructions (Stored in SD1502)
Error code Error definition Cause Processing
1
There is either a non-numeric or
non-normalized number.
2
Symbol error
(The number is negative)
3
Number error
(The number is outside the range)
4 Integer range is exceeded
5 Tried to divide by 0.
6 An overflow occurred.
Set data, such as operation
constant, loop tag memory, loop
tag past value memory or
execution cycle, has a problem.
Check/correct the set data.
Table 14.2 Processing Numbers of Instructions where Error Occurred (Stored in SD1503)
Processing
No.
Instruction
12345678
S. IN Range
check
Input limiter Engineering
value
reverse
conversion
Digital
Filter
S. OUT1 Input
addition
processing
Change
rate,
upper/lower
limiter
Reset
windup
Output
conversion
S. OUT2 Change
rate,
upper/lower
limiter
Output
conversion
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