Mitsubishi MELSEC QS Series, User Manual

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9
DEVICE EXPLANATION
9.3 Internal System Devices
9.3.2 Special register (SD)
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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
For details on special relays refer to Appendix 2.
Table9.6 Special register classification list
Classification Special register
Diagnostics information
SD0 to 99
System information SD200 to 399
System clock/system counter SD400 to 499
Scan information SD500 to 559
Safety CPU SD560 to 599
Memory SD600 to 699
CC-Link Safety SD1000 to 1299