Special Register (Sd) - Mitsubishi MELSEC QS Series User Manual

9
DEVICE EXPLANATION

9.3.2 Special register (SD)

(1) Definition
A special register is used to store CPU module status data (error diagnostics and
system information).
(2) Special register classifications
Special registers are classified according to their applications, as shown in Table9.6.
(3) Special register that can be used in the program that achieves the safety
function
In the program that achieves the safety function, only SD1000 to SD1299 can be
used.
Remark
Table9.6 Special register classification list
Classification
Diagnostics information
System information
System clock/system counter
Scan information
Safety CPU
Memory
CC-Link Safety
For details on special relays refer to Appendix 2.
Special register
SD0 to 99
SD200 to 399
SD400 to 499
SD500 to 559
SD560 to 599
SD600 to 699
SD1000 to 1299
9.3 Internal System Devices
9.3.2 Special register (SD)
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