Appendix 3 Special Register List - Mitsubishi Q2ACPU User Manual

APPENDICES

APPENDIX 3 Special Register List

The special registers, SD, are internal registers with fixed applications in the PLC.
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 and remote
I/O 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 Table App. 3.1.
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
• New indicates the special register newly added to the QnACPU.
Indicates the relevant CPU module.
Corresponding CPU QnA
Each CPU type name
For details on the following items, refer to the following manuals:
Table App. 3.1. Special register
: 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.
: Can be applied to QnA series and Q2ASCPU series
: Can be applied only to the specific CPU. (e.g. Q4AR, Q2AS)
• Networks Manual of the corresponding network module
• SFC QCPU(Q mode)/QnACPU Programming Manual (SFC)
Function of Item
App - 72
format change.)