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a.
TROUBLESHOOTING
MELSEC-A
8.
TROUBLESHOOTING
Errors may be detected by:
1) the AlSD71 CPU; or
2) the peripheral device during program development and debugging.
This section describes errors detected by the AlSD71 CPU, for other errors
see the SWOGP-AD71 P Operating Manual.
8.1
Errors Detected by AlSD71
The AlSD71 has various error check functions. When an error occurs, an error
code is written to address 45 (X axis) and 345 (Y axis) in the buffer memory.
(1) A new error will overwrite the previous one in the buffer memory.
The
code is displayed on the lower left hand side of the peripheral device's
screen.
(2) Error code "0" indicates no error
(3) Error
reset
Errors are reset by writing a
"1"
to buffer address 201. (See Section 6.3.2
For
resetting of errors using the peripheral device, refer to the SWOGP-
AD71 P Operating Manual.
(7))
(4)
Error detection
X1 B is the error detection flag. Resetting the error also resets X1 B.
Error codes are classified as shown in Table 8.1
Table
8.1
Error Code Classification
I
Error
Code
I
Error
Classification
Remarks
I
I
1
to
49
I
Data range error
I
Refer
to
Section
8.1.1.
I
I
50 to 59
I
AlSD71 HOLD error
I
Refer
to
Section
8.1.2.
I
I
60
to
69
I
Buffer memory write
disable
error
I
Refer to Section
8.1
3 .
I
I
70 to 79
I
A1 SD71 start and operation
error
I
Refer to Section
8.1.4.
I
I
90 to 99
I
Other
error
I
Refer
to
Section
8.1.6.
I
8 - 1
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