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App-155
8
8
8
8
A
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7
8
Appendix 4 SPECIAL REGISTER LIST
TableApp.4.2 Special register
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
D9
Corresponding
CPU
SD50 Error reset
Error number that
performs error
reset
• Stores error number that performs error reset U New
QCPU
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.
• In the alarm, data can be held within the time specified for battery low.
• The error indicates the complete discharge of the battery.
S (Error) New
SD52 Battery low
Bit pattern
indicating where
battery voltage
drop occurred
• Same configuration as SD51 above
• After the alarm is detected (ON), the alarm turns OFF by error detection
(ON). (For the Universal model QCPU only)
• Turns to 0 (OFF) when the battery voltage returns to normal thereafter.
S (Error) New
SD53
AC/DC DOWN
detection
Number of times
for AC/DC DOWN
detection
• Every time the input voltage falls to or below 85% (AC power)/65% (DC
power) of the rating during operation of the CPU module, the value is
incremented by 1 and stored in BIN code.
• The counter repeats increment and decrement of the value ;
0 32767 -32768 0
S (Error) D9005
SD60
Number of
module with
blown fuse
Number of module
with blown fuse
• Value stored here is the lowest station I/O number of the module with
the blown fuse.
S (Error) D9000
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
number took place.
S (Error) D9002
0
b3 b2 b1 b0
CPU error
1: This does not apply to Basic model QCPU.
alarm
error
b15
to
1