Appendices; Appendix 1 Lists Of Special Relays And Special Registers; List Of Special Relays - Mitsubishi MELSEC-A Series Programming Manual

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APPENDICES

Appendix 1 LISTS OF SPECIAL RELAYS AND SPECIAL REGISTERS

Appendix 1.1 List of Special Relays
The special relays are the internal relays that have specific applications in the sequencer.
Therefore, do not turn the special register ON/OFF on the program. (Except for the ones
marked by *1 or *2 in the table.)
Number
Name
*1
Fuse blown
M9000
*2
I/O unit
M9002
verify error
MINI link master
M9004
module error
*1
AC DOWN
M9005
detection
M9006
Battery low
*1
Battery low
M9007
latch
*1
Self-diagnostic
M9008
error
Annunciator
M9009
detection
Operation
M9010
error flag
*1
Operation
M9011
error flag
M9012
Carry flag
Table 1.1 Special Relay List
Description
• Turned on when there is one or more output units
of which fuse has been blown or external power
OFF:Normal
supply has been turned off (only for small type).
ON: Fuse blown unit
Remains on if normal status is restored.
Output modules of remote I/O stations are also
checked fore fuse condition.
• Turned on if the status of I/O module is different
from entered status when power is turned on.
Remains on if normal status is restored.
OFF:Normal
I/O module verification is done also to remote I/O
ON: Error
station modules.
(Reset is enabled only when special registers
D9116 to D9123 are reset.)
• Turned on when the MINI (S3) link error is detected
OFF:Normal
on even one of the MINI (S3) link modules being
ON: Error
loaded. Remains on if normal status is restored.
• Turned on when an momentary power failure of 20
OFF:AC power good
msec or less occurred.
ON: AC power DOWN
Reset when POWER switch is moved from OFF to
ON position.
• Turned on when battery voltage reduces to less
OFF:Normal
than specified. Turned off when battery voltage
ON: Battery low
becomes normal.
• Turned on when battery voltage reduces to less
OFF:Normal
than specified. Remains on if battery voltage
ON: Battery low
becomes normal
OFF:No error
• Turned on when error is found as a result of self-
ON: Error
diagnosis.
• Turned on when
OFF:No detection
executed. Switched off when D9124 data is
ON: Detected
zeroed.
• Turned on when operation error occurs during
OFF:No error
execution of application instruction. Turned off
ON: Error
when error is eliminated.
• Turned on when operation error occurs during
OFF:No error
execution of application instruction. Remains on if
ON: Error
normal status is restored.
OFF:Carry off
• Carry flag used in application instruction.
ON: Carry on
Details
of
OUT F
SET F
APP - 1
Applicable CPU
Usable with all
types of CPUs
Only remote
I/O station
information
is valid for
A2C.
Usable with all
types of CPUs
Only remote
I/O station
information
is valid for
A2C.
Dedicated to AnA,
A2AS, AnU and
QCPU-A (A
Mode).
Usable with all
types of CPUs.
Usable with all
types of CPUs.
Usable with all
types of CPUs.
Usable with all
types of CPUs.
instruction is
Usable with all
types of CPUs.
Unusable with
A3H, A3M, AnA,
A2AS, board,
AnU and QCPU-A
(A Mode).
Usable with all
types of CPUs.
Usable with all
types of CPUs.

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