Mitsubishi Melsec-Q Series User Manual page 516

12.8 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.
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
• 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
U
S/U
<When set>
Set by Indicated only for registers set by system
(When set) Each END
Initial
Status change
Error
Instruction execution
Request
System switching
• Indicates corresponding special register in ACPU
Corresponding ACPU
(When the contents are changed, the special register is represented D9
M9 and QnPRH.)
• New indicates the special register newly added to the Q series CPU module.
Indicates the relevant CPU module.
QCPU
Q00J/Q00/Q01
Qn(H)
Corresponding CPU
QnPH
QnPRH
QnU
Each CPU type name
For details on the following items, refer to the following manuals:
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.
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Table12.33 Descriptions of the special register lists headings
: Set by system
: Set by user (sequence programs or test operations from GX Developer)
: Set by both system and user
: Set during each END processing
: Set only during initial processing (when power supply is turned ON, or when going from STOP to RUN)
: Set only when there is a change in status
: Set when error occurs
: Set when instruction is executed
: Set only when there is a user request (through SM, etc.)
: Set when system switching is executed.
: Indicates all the Q series CPU modules.
: Indicates the Basic model QCPU.
: Indicates the High Performance model QCPU.
: Indicates the Process CPU.
: Indicates the Redundant CPU.
: Indicates the Universal model QCPU
: Can be applied only to the specific CPU. (e.g. Q02U)
• Networks Manual of the corresponding network module
• SFC QCPU(Q mode)/QnACPU Programming Manual (SFC)
Function of Item
format change. Incompatible with the Q00J/Q00/Q01