Appendices; Appendix 1 Special Relay And Special Register List - Mitsubishi Electric MELSEC-Q Series Programming Manual

APPENDICES

Appendix 1
This section lists the special relays and special registers that can be used in SFC programs. For the special relays and special
registers for other programs, refer to the user's manual for the CPU module used.
The heading descriptions in the lists are shown in the table below.
Item
Number
Name
Meaning
Explanation
Set by (When set)
Corresponding CPU
APPENDICES
174

Appendix 1 Special Relay and Special Register List

Special Relay and Special Register List
Function of Item
Indicates special relay and special register number.
Indicates name of special relay and special register.
Indicates contents of special relay and special register.
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
Instruction execution: Set when instruction is executed
Indicates the corresponding CPU module type name.
(1) Basic model QCPU
(2) High Performance model QCPU
(3) Process CPU
(4) Redundant CPU
(5) Universal model QCPU, LCPU