App - 28 App - 28
MELSEC-Q
APPENDIX
Appendix 4 Special Relay (SM) for Remote I/O Modules List
Special relays SM are internal relays whose specifications are decided by the CPU
and remote I/O module. 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 and remote I/O modules.
Use the GX Developer to monitor and control the ON/OFF functions of the remote I/O
module's special relay. Connect the GX Developer to the remote master station or the
remote I/O module, then operate the online menu monitor and the device test.
The following table applies only to special relays related to remote I/O modules.
The headings in the table that follows have the following meanings.
Item Function of Item
Number • Indicates the number of the special relay.
Name • Indicates the name of the special relay.
Meaning • Indicates the nature of the special relay.
Explanation • Contains detailed information about the nature of the special relay.
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 (in sequence program or test operation at a peripheral device)
S/U
: Set by both system and user
<When set>
indicated only if setting is done 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 is generated
Instruction execution : Set when instruction is executed
Request
: Set only when there is a user request
(through SM, etc.)
Corresponding ACPU
M9
• Indicates special relay M9 / corresponding to the ACPU.
(Change and notation when there has been a change in contents)
• Items indicated as "New" have been newly added for Q/QnACPU
Applicable CPU
• Indicates the applicable 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 Q-series CPU
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 details on the following items, see these manuals:
• CPU
• QCPU User's Manual (Function Explanation, Program Fundamentals)
• Networks
• Q-corresponding MELSECNET/H Network System Reference Manual (PLC to
PLC network)
• Q-corresponding MELSECNET/H Network System Reference Manual (Remote
I/O network)
• MELSECNET/10 Network System Reference Manual for QnA/Q4AR
• SFC
• QCPU(Q Mode)/QnACPU Programming Manual (SFC)
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