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CHAPTER9 DEVICES
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9.3 Internal System Devices
9.3.3 Special register (SD)
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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.
*1: Available only for the Q00UJCPU, Q00UCPU, Q01UCPU, and Q02UCPU. ( Section 6.23)
*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. ( Appendix 2)
Remark
For details of the special register, refer to CHAPTER 12.
Table9.4 Special register classification list
Classification Special register
Diagnostics information SD0 to SD199
Serial communication function
SD100 to SD111
*1
System information SD200 to SD399
System clocks and counters SD400 to SD499
Scan information SD500 to SD599
Drive information SD600 to SD699
Instruction related SD700 to SD799
Debugging SD800 to SD899
Latch area SD900 to SD929
Fuse blown module SD1300 to SD1399
Check of I/O modules SD1400 to SD1499
A
QnA conversion compatibility
SD1000 to SD1299
*2 *3
Redundant power supply module information
SD1780 to SD1799
*3