12.7 Special Register List
12
- 81
12
TROUBLESHOOTING
9
EM
C AN
D
LO
W
VOL
TA
G
E
DI
RE
C
T
IVES
10
LO
ADING A
N
D
INST
AL
LA
TION
11
M
A
INTE
NA
NCE
AND
IN
SPE
CTI
O
N
12
TR
OU
BL
ESH
OO
TIN
G
A
P
P
E
NDICE
S
INDE
X
(3) System clocks/counters
SD340
Ethernet
information
Number of
modules mounted
• Indicates the number of mounted Ethernet modules.
S (Initial)
QS
SD341
I/O number
• Indicates the I/O number of mounted Ethernet module.
SD342
Network number
• Indicates the network number of mounted Ethernet module.
SD343
Group number
• Indicates the group number of mounted Ethernet module.
SD344
Station number
• Indicates the station number of mounted Ethernet module.
Table12.22 Special register
Number
Name
Meaning
Explanation
Set by
(When set)
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)
QS
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 to 32767
U
SD420
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
S (Every END)
Number
Name
Meaning
Explanation
Set by
(When set)
Corresponding
CPU