Appendix 2 Lists Of Special Relays And Special Registers - Mitsubishi Electric MELCEC Q Series User Manual

APPENDICES
Appendix2 Lists of Special Relays and Special Registers
Appendix2.1 Special relays
The special relays are the internal relays that have specific applications in the
programmable controller. Therefore, do not turn on or off the special relay on the program.
(Except for the ones marked by *1 or *2 in the table.)
Number Name
*1
Fuse blown
M9000
*2 I/O module
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 App.2.1 Special Relay List
Description
• Turned on when there is one or more output
modules of which fuse has been blown or external
OFF:Normal power supply has been turned off (only for small
ON: Fuse blown module type). 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
OFF:Normal detected on even one of the MINI (S3) link
ON: Error modules being 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 the power is turned off and then on.
• 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 the OUT F or SET F instruction is
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
App - 15
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.
Usable with all
types of CPUs.
Unusable with
A3H, A3M, AnA,
A2AS, A3A board,
AnU and QCPU-A
(A Mode).
Usable with all
types of CPUs.
Usable with all
types of CPUs.