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12.7 Special Register List
12
TROUBLESHOOTING
Table12.20 Special register
Number Name Meaning Explanation
Set by
(When set)
Corresponding
CPU
SD27
Diagnostics
error CPU
identifier
CPU identifier
(CPU A/CPU B)
• The identifier of the CPU module that issued the diagnostics
error (SD0 to SD26) is stored.
0001H : CPU A
0002H : CPU B
S (Error)
QS
SD50 Error reset
Error code to
be cleared
• An error code to be cleared is stored. U
SD51
Battery low
latch
Bit pattern
indicating
where
battery voltage
drop occurred
• All corresponding bits go 1(ON) when battery voltage drops.
• Subsequently, these remain 1(ON) even after battery voltage
has been returned to normal.
S (Error)
SD52 Battery low
Bit pattern
indicating
where
battery voltage
drop occurred
• Same configuration as SD51 above
• Turns to 0 (OFF) when the battery voltage returns to normal
thereafter.
S (Error)
SD53
AC DOWN
detection
Number of
times
for AC DOWN
detection
• Every time the input voltage falls to or below 85% (AC power)
of the rating during calculation of the CPU module, the value
is incremented by 1 and stored in BIN code.
S (Error)
SD61
I/O module
verify error
number
I/O module
verify error
module number
• The lowest I/O number of the module where the I/O module
verification error took place.
S (Error)
SD62
Annunciator
number
Annunciator
number
• The first annunciator number (F number) to be detected is
stored here.
S (Instruction
execution)
SD63
Number of
annunciators
Number of
annunciators
• Stores the number of annunciators searched.
S (Instruction
execution)
SD64
Table of
detected
annunciator
numbers
Annunciator
detection
number
• When F goes ON due to or , the F numbers
which go progressively ON from SD64 through SD79 are
registered.
• The F numbers turned OFF by are deleted from
SD64 - SD79, and the F numbers stored after the deleted F
numbers are shifted to the preceding registers.
After 16 annunciators have been detected, detection of the
17th will not be stored from SD64 through SD79.
S (Instruction
execution)
SD65
SD66
SD67
SD68
SD69
SD70
SD71
SD72
SD73
SD74
SD75
SD76
SD77
SD78
SD79
b15 b1
b0
CPU module battery error
0
to
OUT F
SET F
RST F
SD62 0 50 50 50 50 50 50 50 50 50 50 50 99
(Number
detected)
SD63 0 1 2 3 2 3 4 5 67898
0 505050505050505050505099SD64
SD65
SD66
SD67
SD68
SD69
SD70
SD71
SD72
SD73
SD74
SD75
SD76
SD77
SD78
SD79
0 0 25 25 99 99 99 99 99 99 99 99 15
0 0 0 99 0 15 15 15 15 15 15 15 70
0 0 0 0 0 0 70 70 70 70 70 70
65
0 0 0 0 0 0 0 65 65 65 65 65
38
0000000038383838
110
0 0 0 0 0 0 0 0 0 110110110
151
0 0 151
0
00000000 151
210
000000000 0 0210
0000000000 0 00
0000000000 0 00
0000000000 0 00
0000000000 0 00
0000000000 0 00
0000000000 0 00
0000000000 0 00
(Number of
annunciators
detected)
(Number
detected)
SET
F50
SET
F25
SET
F99
RST
F25
SET
F15
SET
F70
SET
F65
SET
F38
SET
F110
SET
F151
SET
F210
RST
F50