Mitsubishi MELSEC QS Series Programming Manual page 223

Number Name Meaning
Number of points
SD300
assigned for ST
Number of points
SD301
Device
assigned for C
assignment
Number of points
SD302 (Same as the
assigned for D
parameter
Number of points
setting)
SD303
assigned for W
Number of points
SD304
assigned for SW
Number of
SD340
modules mounted
SD341 I/O number
Ethernet
SD342 information Network number
SD343 Group number
SD344 Station number
(3) System clocks/counters
Number Name Meaning
Number of
1 second
SD412 counts in 1-
counter
second units
2n second 2n second
SD414
clock setting clock units
Number of
SD420 Scan counter counts in each
scan
Explanation
• Stores the number of points currently set for ST devices
• Stores the number of points currently set for C devices
• Stores the number of points currently set for D devices
• Stores the number of points currently set for W devices
• Stores the number of points currently set for SW devices
• Indicates the number of mounted Ethernet modules.
• Indicates the I/O number of mounted Ethernet module.
• Indicates the network number of mounted Ethernet module.
• Indicates the group number of mounted Ethernet module.
• Indicates the station number of mounted Ethernet module.
TableApp.3.5 Special register
Explanation
• Following programmable controller CPU module RUN, 1 is
added each second
• Count repeats from 0 to 32767 to -32768 to 0
• Stores value n of 2n second clock (Default is 30)
• Setting can be made between 1 to 32767
• 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
Appendix 3 SPECIAL REGISTER LIST
Set by Corresponding
(When set) CPU
S (Initial)
QS
S (Initial)
Set by Corresponding
(When set) CPU
S (Status
change)
U QS
S (Every END)
App-25