Mitsubishi Q2ACPU User Manual

App - 48
APPENDICES
APPENDIX 2 Special Relay List
Special relays, SM, are internal relays whose applications are fixed in the PLC.
For this reason, they cannot be used by sequence programs in the same way as the
normal internal relays.
However, they can be turned ON or OFF as needed in order to control the CPU module
and remote I/O modules.
The heading descriptions in the following special relay lists are shown in Table App. 2.1.
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)
Table App. 2.1. Explanation of special relay list
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 the corresponding special relay (M9 ) of the ACPU.
(When the contents are changed, the special relay is represented M9 format change.)
• New indicates the special relay newly added to the QnACPU.
Corresponding
CPU
Indicates the corresponding CPU module type name.
QnA : Indicates the QnA series and Q2ASCPU series.
Each CPU module model name: Indicates the relevant specific CPU module. (Example: Q4AR, Q2AS)

Mitsubishi Q2ACPU Specifications

General

Brand	Mitsubishi
Model	Q2ACPU
Category	Controller
Language	English