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APPENDICES
APPENDICES
APPENDIX 1 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 headings in the table that follows have the following meanings.
Item
Number
Name
Meaning
Explanation
Set by (When set)
Corresponding ACPU
M9
Corresponding CPU
For details on the following items, refer to the following manuals:
• Networks
• SFC
POINT
(1) SM1200 to SM1255 are used for QnACPU.
These relays are vacant with QCPU.
(2) Special relays SM1500 and later are dedicated for Q4ARCPU.
App - 1
• Indicates the number of the special relay.
• Indicates the name of the special relay.
• Indicates the nature of the special relay.
• Contains detailed information about the nature of the special relay.
• 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 (in sequence program or test operation at a GX Developer)
S/U
: Set by both system and user
<When set>
indicated only if setting is done by system.
Each END
Initial
Status change
Error
Instruction execution : Set when instruction is executed
Request
• Indicates special relay M9
(Change and notation when there has been a change in contents)
• Items indicated as "New" have been newly added for High performance model
QCPU/QnACPU.
• Indicates the corresponding CPU type name.
+Rem: Can be applied to all CPU types and MELSECNET/H remote I/O modules.
: Can be applied to all types of CPU
QCPU: Can be applied to High Performance model QCPU
QnA: Can be applied to QnA series and Q2ASCPU Series
Remote: Can be applied to the MELSECNET/H remote I/O modules.
Each CPU type name: Can be applied only to the specific CPU. (e.g. Q4ARCPU, Q3ACPU)
• For Q Corresponding MELSECNET/H Network System Reference Manual
(PLC to PLC network)
• For Q Corresponding MELSECNET/H Network System Reference Manual
(Remote I/O network)
• For QnA/Q4AR MELSECNET/10 Network System Reference Manual
QCPU(Q Mode)/QnACPU Programming Manual (SFC)
Function of Item
: 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 is generated
: Set only when there is a user request
(through SM, etc.)
corresponding to the ACPU.
MELSEC-Q
APP
App - 1
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