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MELSEC-Q
11 TROUBLESHOOTING
Special Relay List
(10) For redundant systems (Host system CPU information
1) for Q4AR only
SM1510 to SM1599 are only valid for redundant systems.
All off for standalone systems.
Number
Name
Meaning
Explanation
Set by
(When Set)
ACPU
M9
Applicable
CPU
SM1500 Hold mode
OFF : No-hold
ON : Hold
• Specifies whether or not to hold the output value when a
range over occurs for the S.IN instruction range check.
U New
SM1501 Hold mode
OFF : No-hold
ON : Hold
• Specifies whether or not the output value is held when a
range over occurs for the S.OUT instruction range check.
U New
SM1510 Operation mode
OFF : Redundant
system backup
mode,
independent
system
ON : Redundant
system
separate mode
• Turns on when the operating mode is redundant system
separate.
S
(Each END)
New
SM1511
Start mode when
power supply is on
OFF: System A fixed
mode
ON : Previous control
system latch
mode
• Turns on when the start mode for a redundant system
when the power is turned on is the previous control system
latch mode.
S (Initial) New
SM1512
Start mode when CPU
is started
OFF : Initial start
ON : Hot start
• Turns on when the CPU operation mode is hot start when
the redundant system is started up.
S (Initial) New
SM1513
Operation status when
CPU is started
OFF : Initial start
ON : Hot start
• Turns on when the CPU operation mode is hot start when
the redundant system is actually start up.
S (Initial) New
SM1514
Operation mode when
CPU is switched
OFF : Initial start
ON : Hot start
• Turns on when the operation is hot start when the CPU
operation is switched for a redundant system.
S (Initial) New
SM1515 Output hold mode
OFF : Output reset
ON : Output hold
• Turns on when the output mode during a stop error is
output hold.
S
(Each END)
New
SM1516
Operation system
status
OFF : Control system
ON : Standby system
• Turns on when the CPU operation system status is the
standby system.
S (Status
change)
New
SM1517 CPU startup status
OFF : Power supply
on startup
ON : Operation
system switch
starup
• Turns on when the CPU is started up by the operation
system switch.
• Reset using the user program.
S (Status
change) /U
New
SM1518
Tracking execution
mode
OFF : Batch operation
mode
ON : Carryover mode
• When turned off when the tracking memory is in use during
END, standby is executed until execution is possible.
• When turned on when the tracking memory is being used-
during END, this is repeatedly executed until the next END
U New
SM1520 SM1520 Block 1
SM1521 SM1521 Block 2
SM1522 SM1522 Block 3
SM1523 SM1523 Block 4
SM1524 SM1524 Block 5
SM1525 SM1525 Block 6
SM1526 SM1526 Block 7
SM1527 SM1527 Block 8
SM1528 SM1528 Block 9
SM1529 SM1529 Block 10
SM1530 SM1530 Block 11
SM1531 SM1531 Block 12
SM1532 SM1532 Block 13
SM1533 SM1533 Block 14
SM1534 SM1534 Block 15
SM1535 SM1535 Block 16
SM1536 SM1536 Block 17
SM1537 SM1537 Block 18
SM1538 SM1538 Block 19
SM1539 SM1539 Block 20
SM1540 SM1540 Block 21
SM1541 SM1541 Block 22
SM1542 SM1542 Block 23
SM1543 SM1543 Block 24
SM1544 SM1544 Block 25
SM1545
Data tracking
transmission link
specification
OFF : No trigger
ON : Trigger
SM1545 Block 26
• Specified the blocks to trigger
when the data is transmitted by
the data tracking instruction
S. TRUCK.
U New
Q4AR
1 Host system CPU information is stored.