APP -1 APP -1
PPENDICES
MELSEC-Q
APPENDICES
APPENDIX 1 Special Relay and Special Register List
The special relays and special registers which can be used in SFC programs are shown below.
For information regarding other special relays and special registers (not used at SFC program),
refer to the QCPU (Q mode) / QnACPU Programming Manual (Common Instructions).
The heading descriptions in the lists are shown in the table below.
Item Function of Item
Number • Indicates special relay and special register number.
Name • Indicates name of special relay and special register.
Meaning • Indicates contents of special relay and special register.
Explanation • Discusses contents of special relay and special register in more detail.
• Indicates whether the relay or register 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 relays and registers set by system
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
Set by
(When set)
Instruction execution : Set when instruction is executed
Corresponding
CPU
Indicates the corresponding CPU module type name.
APP
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