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App-134
(9) A to Q conversion correspondences
Special relays SM1000 to SM1255 are the relays which correspond to ACPU special relays
M9000 to M9255 after A to Q conversion.
(However, the Basic model QCPU and Redundant CPU do not support the A to Q
conversion.)
These special relays are all set by the system, and cannot be set by the user program.
To turn them ON/OFF by the user program, change the special relays in the program into
those of QCPU.
However, some of SM1084 and SM1200 to SM1255 (corresponding to M9084 and M9200 to
M9255 before conversion) can be turned ON/OFF by the user program, if they could be
turned ON/OFF by the user program before conversion.For details on the ACPU special
relays, see the user's manuals for the individual CPUs, and MELSECNET or MELSECNET/
B Data Link System Reference Manuals
POINT
Check "Use special relay/special register from SM/SD1000" for "A-PLC" on the
PLC system tab of PLC parameter in GX Developer when the converted special
relays are used with the High Performance model QCPU, Process CPU, and
Universal model QCPU.
When not using the converted special relays, uncheck "Use special relay/special
register from SM/SD1000" to save the time taken for processing special relays.
Remark
The following are additional explanations about the Special Relay for Modification
column.
When a special relay for modification is provided, the device number should
be changed to the provided QCPU special relay.
When is provided, the converted special relay can be used for the device
number.
When is provided, the device number does not work with QCPU.
*1: The relevant modules are as follows:
• The Universal model QCPU whose serial number (first five digits) is "10102" or later.
• Q00UJCPU, Q00UCPU, Q01UCPU
TableApp.3.10 Special relay
ACPU
Special
Relay
Special
Relay after
Conversion
Special
Relay for
Modification
Name Meaning Details
Corresponding
CPU
M9000 SM1000
–
Fuse blown
OFF : Normal
ON : Module with blown
fuse
• Turned on when there is one or more output modules of
which fuse has been blown.
• Remains ON if the condition is restored to normal
thereafter.
• Output modules of remote I/O stations are also checked
fore fuse condition.
Qn(H)
QnPH
QnU
*1
M9002 SM1002
–
I/O module verify
error
OFF : Normal
ON : Error
• Turned on if the status of I/O module is different form
entered status when power is turned on.
• Remains ON if the condition is restored to normal
thereafter.
• I/O module verification is done also to remote I/O station
modules.
• Reset is enabled only when special registers SD1116 to
SD1123 are reset.