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APPENDICES
A
Appendix 4 Special Register (SD) for MELSECNET/H (MELSECNET/10 Mode) Remote I/O Station
Do not change the values of special register set by system using a program or by test operation. Doing so may result in
system down or communication failure.
(1) Diagnostic information
No. Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
D9
Corres-
ponding
CPU
SD0
Diagnostic
errors
Diagnostic
error code
• This register stores the error code of an error detected by
diagnostics.
• Contents identical to latest error history information.
S
(Error)
D9008
format
change
Rem
SD1
Clock time for
diagnosis
error
occurrence
Clock time for
diagnosis error
occurrence
This register stores the year (last two digits) and the month when the
SD0 data is updated in 2-digit BCD.
New
SD2
This register stores the day and the hour when the SD0 data is
updated in 2-digit BCD.
SD3
This register stores the minute and the second when the SD0 data is
updated in 2-digit BCD.
Year (0 to 99) Month (1 to 12)
B15 B7 B0B8to to (Example)
: October, 1995
H9510
Day (1 to 31) Hour (0 to 23)
B15 B7 B0B8to to (Example)
: 10 a.m. 25th
H2510
Minutes (0 to 59) Seconds (0 to 59)
B15 B7 B0B8to to (Example)
: 35 min. 48 sec.
H3548