Mitsubishi MELSEC-A series, Programming Manual

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APP - 16
APPENDICES
Appendix 1.3 Special Registers
Special registers are data registers of which applications have been determined inside the
PC. Therefore, do not write data to the special registers in the program (except the ones
with numbers marked 2 in the table).
Table 1.4 Special Register List
Number Name Description Details Applicable CPU
D9000 Fuse blow
Fuse blow module
number
• When fuse blown modules are detected, the lowest
number of detected units is stored in hexadecimal.
(Example: When fuses of Y50 to 6F output modules
have blown, "50" is stored in hexadecimal) To monitor
the number by peripheral devices, perform monitor
operation given in hexadecimal.
(Cleared when all contents of D9100 to D9107 are
reset to 0.)
• Fuse blow check is executed also to the output
modules of remote I/O stations.
Unusable with
A0J2H.
Only remote
I/O station
information
is valid for
A2C.
D9001 Fuse blow
Fuse blow module
number
• Stores the module numbers corresponding to setting
switch numbers or base slot numbers when fuse blow
occurred.
—
Dedicated to
A0J2H.
I/O Module for A0J2 Extension Base Unit
Setting
Switch
Stored Data
Base Unit
Slot No.
Stored Data
0 1 0 5
1 2 1 6
2 3 2 7
3 4 3 8
4 5
5 6
6 7
7 8
• In case of remote I/O station, (module I/O number/10H)
+ 1 is stored.
D9002
I/O module
verify error I/O module verify
error unit number
• If an I/O module whose data is different from the
entered data when the power is turned on is detected,
the head I/O number of the detected module is stored
in hexadecimal. When the situation is detected in
multiple modules, the lowest number among the
module will be stored. (Storing method is the same as
that of D9000.) To monitor the number by peripheral
devices, perform monitor operation given in
hexadecimal.
(Cleared when all contents of D9116 to D9123 are
reset to 0.)
• I/O module verify check is executed also to the
modules of remote I/O terminals.
Unusable with
A0J2H.
Only remote
I/O station
information
is valid for
A2C.
• If an I/O module, of which data is different from data
entered, is detected when the power in turned on, the
I/O number corresponding to the setting switch No. or
base unit No. is stored.(Storing method is the same as
that of D9001).
• In case of remote I/O station, (module I/O number/10H)
+ 1 is stored.
—
Dedicated to
A0J2H.