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App-146
Appendix 4 SPECIAL REGISTER LIST
The special registers, SD, are internal registers with fixed applications in the Programmable
Controller.
For this reason, it is not possible to use these registers in sequence programs in the same way
that normal registers are used.
However, data can be written as needed in order to control the CPU modules.
Data stored in the special registers are stored as BIN values if no special designation has been
made to the contrary.
The heading descriptions in the following special register lists are shown in 4.1.
For details on the following items, refer to the following manuals:
• Networks Manual of the corresponding network module
• SFC QCPU(Q mode)/QnACPU Programming Manual (SFC)
POINT
Do not change the values of special relays set by the system with user program or
device test operations.
Doing so may result in system downtime or communication fault.
TableApp.4.1 Descriptions of the special register lists headings
Item Function of Item
Number • Indicates special register number
Name • Indicates name of special register
Meaning • Indicates contents of special register
Explanation • Discusses contents of special register in more detail
Set by
(When set)
• Indicates whether the relay is set by the system or user, and, if it is set by the system, when setting is performed.
<Set by>
S : Set by system
U : Set by user (sequence programs or test operations from GX Developer)
S/U : Set by both system and user
<When set>
Indicated only for registers set by system
Each END : Set during each END processing
Initial : Set only during initial processing (when power supply is turned ON, or when going from STOP to RUN)
Status change : Set only when there is a change in status
Error : Set when error occurs
Instruction execution : Set when instruction is executed
Request : Set only when there is a user request (through SM, etc.)
System switching : Set when system switching is executed.
Corresponding ACPU
M9
• Indicates corresponding special register in ACPU
(When the contents are changed, the special register is represented D9 format change. Incompatible with the Q00J/Q00/Q01
and QnPRH.)
• New indicates the special register newly added to the Q series CPU module.
Corresponding CPU
Indicates the relevant CPU module.
QCPU : Indicates all the Q series CPU modules.
Q00J/Q00/Q01 : Indicates the Basic model QCPU.
Qn(H) : Indicates the High Performance model QCPU.
QnPH : Indicates the Process CPU.
QnPRH : Indicates the Redundant CPU.
QnU : Indicates the Universal model QCPU
Each CPU type name : Can be applied only to the specific CPU. (e.g. Q02U)