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Appendix 3.5.2 Special register list

TableApp.42 lists the special register not supported in the Universal model QCPU and measures to be 
taken 

(To the next page)

SD80

CHK number

The Universal model QCPU does not support the CHK instruction. For the replacing 
method of the CHK instruction, refer to Appendix 3.3.

SD90

Step transition monitoring timer 
setting value

The Universal model QCPU does not support the step transition monitoring timer 
function. For the replacing method of this function, refer to ”Appendix 3. Restrictions 
and replacing method of the Basic model QCPU and Universal model QCPU" in the 
QCPU (Q Mode)/QnACPU Programming Manual (SFC).

SD91

SD92

SD93

SD94

SD95

SD96

SD97

SD98

SD99

SD130 to 
SD137

Fuse blown module

Replace SD130 to SD137 with SD1300 to SD1307.

SD150 to 
SD157

I/O module verify error

Replace SD150 to SD157 with SD1400 to SD1407.

SD245

No. of base slots (Mounting status)

Replace SD245 and SD246 with SD243 and SD244, respectively.

SD246

SD280

CC-Link error

Replace these registers with the I/O signals (Xn0, Xn1, and XnF) of the mounted CC-
Link module.

SD281

SD315

Time reserved for communication 
processing

Service processing setting is available for the Universal model QCPU on the PLC 
system setting tab of the PLC parameter dialog box.
Select  "Specify service process time." for the service processing setting parameter 
and set the service processing time. Other setting methods can be selected as well.

SD394

CPU mounting information

• Check the type and model of other CPU modules mounted on the System monitor 

screen of GX Developer.

• Check the mounting status of other CPU modules in SD396 to SD398.

SD430

Low-speed scan counter

The Universal model QCPU does not support low-speed execution type programs. 
Delete the corresponding sections or replace them with the special register for scan 
execution type programs (SD420).

SD510

Low-speed execution type program 
number

The Universal model QCPU does not support low-speed execution type programs. 
Delete the corresponding sections or replace them with the special register for scan 
execution type programs (SD500).

SD528

Current scan time for low-speed 
execution type programs

The Universal model QCPU does not support low-speed execution type programs. 
Delete the corresponding sections or replace them with the special register for scan 
execution type programs (SD520 and SD521).

SD529

SD532

Minimum scan time for low-speed 
execution type programs

The Universal model QCPU does not support low-speed execution type programs. 
Delete the corresponding sections or replace them with the special registers for scan 
execution type programs (SD524 to SD527).

SD533

SD534

Maximum scan time for low-speed 
execution type programs

SD535

SD544

Cumulative execution time for low-
speed execution type programs

The Universal model QCPU does not support low-speed execution type programs. 
Delete the corresponding sections.

SD545

SD546

Execution time for low-speed 
execution type programs

The Universal model QCPU does not support low-speed execution type programs. 
Delete the corresponding sections.

SD547