Mitsubishi Electric MELSEC-Q Series User Manual page 229

APPENDICES
Number Name
Number of points
SD299
Device
allocated for T
allocation
Number of points
SD300 (Same as
allocated for ST
parameter
Number of points
contents)
SD301
allocated for C
Number of points
SD302
Device
allocated for D
allocation
Number of points
SD303 (Same as
allocated for W
parameter
Number of points
contents)
SD304
allocated for SW
Time reserved
Time reserved for
for
SD315 communication
communication
processing
processing
No. of modules
SD340
installed
SD341 I/O No.
Ethernet
SD342 information Network No.
SD343 Group No.
SD344 Station No.
(3) System clocks/counters
Number Name
1 second Number of counts in
SD412
counter 1-second units
2n second clock
SD414 2n second clock units
setting
Number of counts in
SD420 Scan counter
each scan
App - 13
Special Register List (Continued)
Meaning
• Stores the number of points currently set for T device
• 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
Reserves the designated time for communication processing with GX Developer or
other units.
The greater the value is designated, the shorter the response time for
communication with other devices (GX Developer, serial communication units)
becomes.
Setting range: 1 to 100 ms
If the designated value is out of the range above, it is assumed to no setting.
The scan time becomes longer by the designated time.
• Indicates the number of modules installed on Ethernet.
• Indicates the I/O No. of the installed Ethernet.
• Indicates the network No. of the installed Ethernet.
• Indicates the group No. of the installed Ethernet.
• Indicates the station No. of the installed Ethernet.
Meaning
• Following programmable controller CPU 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 and 32767
• Incremented by 1 for each scan execution after the PLC is set to RUN.
• Count repeats from 0 to 32767 to -32768 to 0
Explanation
Explanation
MELSEC-Q
Set by (When set)
S (Initial)
S (Initial)
END processing
S (Initial)
Set by (When set)
S (Status change)
U
S(Every END
processing)
App - 13