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CHAPTER12 PECIAL RELAY LIST AND SPECIAL REGISTER LIST
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12.2 SPECIAL REGISTER LIST
*9: Function version is B or later.
*11: The Universal model QCPU except the Q00UJCPU, Q00UCPU, Q01UCPU, and Q02UCPU.
*17: The Universal model QCPU except the Q00UJCPU.
(3) System clocks/counters
Table12.20 Special register
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
D9
Corresponding
CPU
SD393
Multiple CPU
system
information
Number of
multiple CPUs
• The number of CPU modules that comprise the multiple CPU system is
stored. (1 to 3, Empty also included)
S (Initial) New
Q00/Q01
*9
QnU
SD394
CPU mounting
information
• The CPU module types of No. 1 CPU to 3 and whether the CPU
modules are mounted or not are stored.
Q00/Q01
*9
SD395
Multiple CPU
number
• In a multiple CPU system configuration, the CPU number of the host
CPU is stored.
CPU No. 1: 1, CPU No. 2: 2, CPU No. 3: 3, CPU No. 4: 4
S (Initial) New
Q00/Q01
*9
Qn(H)
*9
QnPH
QnU
SD396
No. 1 CPU
operation status
The operation information of each CPU No. is stored.
(The information on the number of multiple CPUs indicated in SD393 is
stored.)
S (END
processing
error)
New
Q00/Q01
*9
QnU
*17
SD397
No. 2 CPU
operation status
SD398
No. 3 CPU
operation status
SD399
No. 4 CPU
operation statu
QnU
*11
Table12.21 Special register
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
D9
Corresponding
CPU
SD412
1 second
counter
Number of counts
in 1-second units
• Following programmable controller CPU module RUN, 1 is added each
second
• Count repeats from 0 to 32767 to -32768 to 0
S (Status
change)
D9022
QCPU
SD414
2n second clock
setting
2n second clock
units
• Stores value n of 2n second clock (Default is 30)
• Setting can be made between 1 and 32767
UNew
SD415
2nms clock
setting
2nms clock units
• Stores value n of 2nms clock (Default is 30)
• Setting can be made between 1 and 32767
UNew
Qn(H)
QnPH
QnPRH
QnU
SD420 Scan counter
Number of counts
in each scan
• Incremented by 1 for each scan execution after the CPU module is set to
RUN.
(Not counted by the scan in an initial execution type program.)
• Count repeats from 0 to 32767 to -32768 to 0
S (Every END
processing)
New
• Incremented by 1 for each scan execution after the CPU module is set to
RUN.
• Count repeats from 0 to 32767 to -32768 to 0
S (Every END
processing)
New Q00J/Q00/Q01
SD430
Low speed scan
counter
Number of counts
in each scan
• Incremented by 1 for each scan execution after the CPU module is set to
RUN.
• Count repeats from 0 to 32767 to -32768 to 0
• Used only for low speed execution type programs
S (Every END
processing)
New
Qn(H)
QnPH
b15 b8b7b12b11 b4 b3 b0
Empty (0)
toto to
to
CPU No.2CPU No.3 CPU No.1
SD394
CPU module mounted or
not mounted
0: Not mounted
1: Mounted
CPU module type
0: PLC CPU
1: Motion CPU
2: PC CPU
b15
b8 b7 b4 b3 b0
to to
to
b14
Vacancy Classification Operation status
4: Initial
F
H: Reset
F
H: Reset
0: Normal
1: Minor fault
2: Medium fault
3: Major fault
0: RUN
2: STOP
3: PAUSE
mounted
0: Not mounted
1: Mounted