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Appendix 3 SPECIAL RELAY LIST
TableApp.3.13 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
M9
Corresponding
CPU
SM1549
Data tracking transfer
trigger specification
OFF : No trigger
ON : Trigger
SM1549 Block 30
• When data is transferred
based on the tracking set-
ting of the redundant
parameter dialog box, the
target block is specified
as trigger.
• When "Auto tracking
block No. 1" is enabled in
the tracking setting,
SM1520 is turned ON by
the system at power ON/
STOP to RUN. In other
cases, SM1520 to
SM1583 are turned ON
by the user.
S (initial)/U New
QnPRH
SM1550 SM1550 Block 31
SM1551 SM1551 Block 32
SM1552 SM1552 Block 33
SM1553 SM1553 Block 34
SM1554 SM1554 Block 35
SM1555 SM1555 Block 36
SM1556 SM1556 Block 37
SM1557 SM1557 Block 38
SM1558 SM1558 Block 39
SM1559 SM1559 Block 40
SM1560 SM1560 Block 41
SM1561 SM1561 Block 42
SM1562 SM1562 Block 43
SM1563 SM1563 Block 44
SM1564 SM1564 Block 45
SM1565 SM1565 Block 46
SM1566 SM1566 Block 47
SM1567 SM1567 Block 48
SM1568 SM1568 Block 49
SM1569 SM1569 Block 50
SM1570 SM1570 Block 51
SM1571 SM1571 Block 52
SM1572 SM1572 Block 53
SM1573 SM1573 Block 54
SM1574 SM1574 Block 55
SM1575 SM1575 Block 56
SM1576 SM1576 Block 57
SM1577 SM1577 Block 58
SM1578 SM1578 Block 59
SM1579 SM1579 Block 60
SM1580 SM1580 Block 61
SM1581 SM1581 Block 62
SM1582 SM1582 Block 63
SM1583 SM1583 Block 64
SM1590
System switching
enable/disable flag
from network module
OFF : System switching
request issuing module
absent
ON : System switching
request issuing module
present
• Turns ON when a system switching request is issued
from the network module. The module No. that
issued system switching can be checked by SD1590.
• Turns OFF when all bits of SD1590 are OFF.
S (Each END) New
SM1591
Standby system error
detection disable flag
at system switching
ON : Error is not detected by
new standby system at
system switching
OFF : Error is detected by
new standby system at
system switching
This flag is used to determine if the new standby station
detects 6210:STANDBY during system switching.
This applies to the following switching methods:
• System switching from GX Developer
• System switching using dedicated instruction
• System switching by the intelligent function module
UNew
SM1592
Enable/disable user
system switching
OFF : Disable user system
switching
ON : Enable user system
switching
• This flag enables system switching by the user from
GX Developer or by dedicated instruction.
(SP.CONTSW).
UNew