11 TROUBLESHOOTING
Special Register List
(1) Diagnostic Information
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| Set by | Corresponding | Corresponding | |
Number | Name | Meaning | Explanation | (When | ACPU | ||
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| set) | D9 | ||
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SD0 | Diagnostic | Diagnosis | • Error codes for errors found by diagnosis are stored as BIN data. | S (Error) | D9008 format |
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| errors | error code | • Contents identical to latest fault history information. |
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•Year (last two digits) and month that SD0 data was updated is stored as BCD
SD1 |
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| B15 | to | B8 |
| B7 | to | B0 | (Example) |
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| Year (0 to 99) |
| Month (1 to 12) | : | October, 1995 |
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| H9510 |
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| Clock time for | • The day and hour that SD0 was updated is stored as BCD |
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| Clock time for | code. |
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SD2 | diagnosis | B15 | to | B8 |
| B7 | to | B0 |
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| diagnosis error | error | Day (1 to 31) |
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| Hour (0 to 23) | : | 10 a.m. on 25th | S (Error) | New | ||||
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| occurrence | occurrence |
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| H2510 |
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•The minute and second that SD0 data was updated is stored as BCD
SD3 | B15 to B8 |
| B7 to B0 | (Example) |
| Minutes (0 to 59) |
| Seconds (0 to 59) | : 35 min. 48 sec. |
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| (past the hour) | ||
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| H3548 |
Category codes which help indicate what type of information is being stored in the common information areas (SD5 through SD15) and the individual information areas (SD16 through SD26) are stored here.
B15 | to | B8 B7 | to | B0 | |
Individual information |
| Common information | +Rem | ||
| category codes |
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| category codes |
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•The common information category codes store the following codes: 0 : No error
1 : Unit/module No./ PLC No./Base No. 
2 : File name/Drive name
3 : Time (value set)
4 : Program error location
| Error | Error | 5 : Switch cause (for Q4AR only) |
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| : For a multiple PLC system, the module number or PLC |
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SD4 | information | information | S (Error) | New | ||
number is stored depending on the error that occurred. | ||||||
| categories | category code |
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| (Refer to the corresponding error code for which number |
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| has been stored.) |
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| PLC No. 1: 1, PLC No. 2: 2, PLC No. 3: 3, PLC No. 4: 4 |
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•The individual information category codes store the following codes: 0 : No error
1 : (Open)
2 : File name/Drive name
3 : Time (value actually measured)
4 : Program error location
5 : Parameter number
6 : Annunciator number
7 : Check instruction malfunction number
11 - 65 | 11 - 65 |