Mitsubishi MELSEC Q Series - Page 1185

App-177
8
8
8
8
A
6
7
8
Appendix3 SPECIAL RELAY LIST
SM1515
Control system
judgment flag
• Indicates operation system status.
• The flag status does not change even if the tracking cable is
disconnected.
S (Status
change)
New QnPRH
SM1516
Standby system
judgment flag
SM1517
CPU module
startup status
OFF : Power supply on
startup
ON : Operation system
switch start up
Turns on when the CPU module is started
up by the system switching (switching from
the standby system to the control system).
Remains OFF when the standby system is
switched to the control system by a power-
ON startup.
S (Status
change)
SM1518
Standby system to
control system
switching status
flag
• This relay turns on during one scan after
the standby system was switched to the
control system.
• This relay can be used only in a scan
execution type program.
S (Every END
processing)
SM1519
Previous Control
System
Identification Flag
When the previous control system is System
B, this relay turns on during one scan in
System A, following the RUN state after
both Systems A and B were simultaneously
turned on or were reset.
SM1520
Data tracking
transfer trigger
specification
OFF : No trigger
ON : Trigger
SM1520 Block 1
• When data is
transferred
based on the
tracking setting
of the
Redundant
parameter
dialog box, the
target block is
specified as
trigger.
• When "Do auto
forward
Tracking block
No.1" is
selected for the
tracking
setting,
SM1520 is
turned on by
the system at
power-on or
when the
system is
switched from
STOP to
RUN.In other
cases, SM1520
to SM1583 are
turned on by
the user.
S (initial)/U
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 SM1545 Block 26
SM1546 SM1546 Block 27
SM1547 SM1547 Block 28
SM1548 SM1548 Block 29
SM1549 SM1549 Block 30
SM1550 SM1550 Block 31
SM1551 SM1551 Block 32
Number
Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
M9
Corresponding
CPU
SM1515
SM1516
ON
OFF
Control
system
OFF
Standby
system
ON
OFF
OFF
If TRK. CABLE ERR.
(error code: 6210) occurred (Unknown)
ON
OFF
1 scan
O
N
OFF
1 scan