App-169
8
8
8
8
A
6
7
8
Appendix3 SPECIAL RELAY LIST
(9) Conversion from A series to Q or L series
The special relay (M9000 to M9255) for ACPU corresponds to the special relay (SM1000 to SM1255) for QCPU
or LCPU after the A to Q/L conversion. (Note that the Basic model QCPU and Redundant CPU do not support the
A to Q/L conversion.) All bits in this area of the special relay are turned on or off by system (cannot be turned on
or off by user using a program). To turn on or off the bit by user, correct the program using the special relay for
QCPU or LCPU. The special relay (M9084, M9200 to M9255), however, includes the areas that can be turned on
or off by user. For those areas, the bit can be turned on or off by user in the converted special relay (SM1084,
SM1200 to SM1255) as well. For details on the special relay for ACPU, refer to the following.
User's manual for the CPU module used
Type MELSECNET, MELSECNET/B Data Link System Reference Manual
To use the converted special relay in the High Performance model QCPU, Process CPU,
Universal model QCPU, or LCPU, check "Use special relay/special register from SM/
SD1000" under "A-PLC Compatibility Setting".
Project window [Parameter] [PLC Parameter] [PLC System]
Note that the processing time will increase when the converted special relay is used.
[How to read the Special Relay for Modification column]
• If the special relay number for QCPU or LCPU is provided, correct the program using it.
• means that the converted special relay can be used.
• means that the special relay cannot be used in QCPU or LCPU.
ACPU
Special
Relay
Special
Relay after
Conversion
Special
Relay for
Modification
Name Meaning Details
Corres-ponding
CPU
M9000 SM1000 - Fuse blown
OFF : Normal
ON : Module with
blown fuse
• Turns on if there is at least one output module
whose fuse has blown.
• This relay remains on even after the condition
returns to normal.
• Output modules on remote I/O stations are
also checked for blown fuse.
Qn(H)
QnPH
QnU
*1
M9002 SM1002 -
I/O module
verify error
OFF : Normal
ON : Error
• This relay turns on if the status of the I/O
module differs from that registered at
power-on.
• This relay remains on even after the system
returns to normal.
• I/O modules on remote I/O stations are also
checked.
• This relay is reset only when SD1116 to
SD1123 are reset.
Qn(H)
QnPH
QnU
*1
LCPU
M9005 SM1005 -
AC DOWN
detection
OFF : AC DOWN not
detected
ON : AC DOWN
detected
• This relay turns on if a momentary power
failure within 20ms occurs during use of an
AC power supply module.
• This relay is reset when the CPU module is
powered off and then on.
Qn(H)
QnPH
QnU
*1
• This relay turns on if a momentary power
failure within 10ms occurs when using an AC
power supply module.
• This relay is reset when the CPU module is
powered off and then on.
LCPU
• This relay turns on if a momentary power
failure within 10ms occurs during use of a DC
power supply module.
• This relay is reset when the CPU module is
powered off and then on.
Qn(H)
QnPH
QnU
*1
LCPU
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