Special Register (Sd) - Mitsubishi Electric melsec q00ujcpu User Manual

9.3.3 Special register (SD)

(1) Definition
The special register (SD) is an internal relay of which details are specified inside the programmable controller,
and the CPU module status data (such as error diagnostics or system information) are stored in this special
register.
(2) Special register classifications
Table9.4 shows special register classifications.
Diagnostics information
Serial communication function
System information
System clocks and counters
Scan information
Drive information
Instruction related
Debugging
Latch area
Fuse blown module
Check of I/O modules
A QnA conversion compatibility
Redundant power supply module information
*1: Available only for the Q00UJCPU, Q00UCPU, Q01UCPU, and Q02UCPU. (
*2: Valid only when "Use special relay/special register from SM/SD1000" is selected in the PLC system tab of the PLC
parameter dialog box.
*3: Applicability differs depending on the CPU module version. (
Remark
For details of the special register, refer to CHAPTER 12.
Table9.4 Special register classification list
Classification Special register
SD0 to SD199
*1
SD100 to SD111
SD200 to SD399
SD400 to SD499
SD500 to SD599
SD600 to SD699
SD700 to SD799
SD800 to SD899
SD900 to SD929
SD1300 to SD1399
SD1400 to SD1499
*2 *3
SD1000 to SD1299
SD1780 to SD1799
Section 6.23)
Appendix 2)
CHAPTER9 DEVICES
9
2
3
4
5
6
7
8
*3
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